567 lines
29 KiB
Markdown
567 lines
29 KiB
Markdown
# Table of Contents
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- [Table of Contents](#table-of-contents)
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- [About ffmpeg](#about-ffmpeg)
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- [Get Video Info with `mediainfo`](#get-video-info-with-mediainfo)
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- [Get Test Image with ffmpeg](#get-test-image-with-ffmpeg)
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- [Batch-ify ffmpeg Command](#batch-ify-ffmpeg-command)
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- [Add Metadata to File](#add-metadata-to-file)
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- [Create Slow-mo](#create-slow-mo)
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- [Transcode Profiles](#transcode-profiles)
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- [Original \[40.3 Mb/s\]](#original-403-mbs)
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- [Mediainfo](#mediainfo)
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- [Test Image](#test-image)
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- [CRF 21 \[19.9 Mb/s\]](#crf-21-199-mbs)
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- [Mediainfo](#mediainfo-1)
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- [Test Image](#test-image-1)
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- [CRF 27 \[10.3 Mb/s\]](#crf-27-103-mbs)
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- [Mediainfo](#mediainfo-2)
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- [Test Image](#test-image-2)
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- [1080p CRF 21 \[11.9 Mb/s\]](#1080p-crf-21-119-mbs)
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- [Mediainfo](#mediainfo-3)
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- [Test Image](#test-image-3)
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- [1080p CRF 27 \[6,232 kb/s\]](#1080p-crf-27-6232-kbs)
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- [Mediainfo](#mediainfo-4)
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- [Test Image](#test-image-4)
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- [720p CRF 21 \[6,314 kb/s\]](#720p-crf-21-6314-kbs)
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- [Mediainfo](#mediainfo-5)
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- [Test Image](#test-image-5)
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- [720p CRF 27 \[3,305 kb/s\]](#720p-crf-27-3305-kbs)
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- [Mediainfo](#mediainfo-6)
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- [Test Image](#test-image-6)
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- [Test a New Profile](#test-a-new-profile)
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# About ffmpeg
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FFmpeg is a free and open-source software project consisting of a suite of libraries and programs for handling video, audio, and other multimedia files and streams. At its core is the command-line ffmpeg tool itself, designed for processing of video and audio files. [Wikipedia](https://en.wikipedia.org/wiki/FFmpeg). [ffmpeg.org](https://ffmpeg.org/).
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# Get Video Info with `mediainfo`
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MediaInfo is a free, cross-platform and open-source program that displays technical information about media files, as well as tag information for many audio and video files. [Wikipedia](https://en.wikipedia.org/wiki/MediaInfo).
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To install on Debian, run `sudo apt install mediainfo`.
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To get comprehensive media information about a file, simply use `mediainfo <file>`.
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# Get Test Image with ffmpeg
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To get the test image, we extract frame of timestamp 15:20.01 from the test video with `ffmpeg -ss 00:15:20.01 -i "$input" -frames:v 1 "$output"`.
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# Batch-ify ffmpeg Command
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For a given `ffmpeg -i $video <do stuff>`, apply the command to all `.mp4` videos in a directory and send all outputs to `./Transcodes/` with the following structure:
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```bash
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for video in ./*.mp4
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do
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ffmpeg -i "$video" <do stuff> "Transcodes/${video%.*}.mp4"
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done
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```
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# Add Metadata to File
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ffmpeg can add metadata to files using the `-metadata` flag. In the profiles described below, this is used to add a comment describing the profile used to create the file (e.g. `-metadata comment="x264 720p CRF 27"`).
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This comment flag is visible in Windows file details.
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More information: [corbpie.com](https://write.corbpie.com/adding-metadata-to-a-video-or-audio-file-with-ffmpeg/).
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# Create Slow-mo
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Creating a slow-mo clip is a two-step process. This assumes your input is encoded with h264.
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1. Copy the video to a raw h264 bitstream: `ffmpeg -i "$input" -map 0:v -c:v copy -bsf:v h264_mp4toannexb 'raw.h264'`
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2. Generate new timestamps for each frame with `genpts` (generate presentation timestamps): `ffmpeg -fflags +genpts -r 30 -i raw.h264 -c:v copy -movflags faststart "$output"`. The `-r 30` flag sets the new framerate to 30 frames per second.
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3. Optionally, interpolate motion for the newly slowed video: `ffmpeg -i "$input" -filter:v "minterpolate='mi_mode=mci:mc_mode=aobmc:vsbmc=1:fps=60'" "$output"`
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Note that these slow-mo files will have no audio.
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If you need audio, or just more information, see the [ffmpeg docs](https://trac.ffmpeg.org/wiki/How%20to%20speed%20up%20/%20slow%20down%20a%20video).
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For documentation on interpolation settings, see [ffmpeg.org](http://ffmpeg.org/ffmpeg-filters.html#minterpolate)
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# Transcode Profiles
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## Original [40.3 Mb/s]
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The pre-transcode data for the sample video. It was recorded using OBS with the following encoder settings at 1440p60:
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| Parameter | Value |
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|:---------:|:-----:|
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| Rate Control | CBR |
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| Bitrate | 40000 Kbps |
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| Keyframe interval | 0s (auto) |
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| Preset | Quality |
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| Profile | high |
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| Look-ahead | Yes |
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| Psycho Visual Tuning | Yes |
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| GPU | Nvidia RTX 3060 Ti |
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| Max B-Frames | 2 |
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### Mediainfo
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```
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General
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Complete name : ffmpeg test file.mp4
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Format : MPEG-4
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Format profile : Base Media
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Codec ID : isom (isom/iso2/avc1/mp41)
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File size : 4.57 GiB
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Duration : 16 min 12 s
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Overall bit rate mode : Constant
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Overall bit rate : 40.3 Mb/s
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Writing application : Lavf59.16.100
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Video
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ID : 1
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Format : AVC
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Format/Info : Advanced Video Codec
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Format profile : High@L5.1
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Format settings : CABAC / 4 Ref Frames
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Format settings, CABAC : Yes
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Format settings, Reference frames : 4 frames
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Codec ID : avc1
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Codec ID/Info : Advanced Video Coding
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Duration : 16 min 12 s
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Source duration : 16 min 12 s
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Bit rate mode : Constant
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Bit rate : 40.0 Mb/s
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Width : 2 560 pixels
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Height : 1 440 pixels
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Display aspect ratio : 16:9
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Frame rate mode : Variable
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Frame rate : 60.000 FPS
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Minimum frame rate : 58.824 FPS
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Maximum frame rate : 62.500 FPS
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Color space : YUV
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Chroma subsampling : 4:2:0
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Bit depth : 8 bits
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Scan type : Progressive
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Bits/(Pixel*Frame) : 0.181
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Stream size : 4.53 GiB (99%)
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Source stream size : 4.53 GiB (99%)
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Color range : Limited
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Color primaries : BT.709
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Transfer characteristics : BT.709
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Matrix coefficients : BT.709
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mdhd_Duration : 972666
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Codec configuration box : avcC
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Audio
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ID : 2
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Format : AAC LC
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Format/Info : Advanced Audio Codec Low Complexity
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Codec ID : mp4a-40-2
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Duration : 16 min 12 s
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Bit rate mode : Constant
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Bit rate : 318 kb/s
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Channel(s) : 2 channels
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Channel layout : L R
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Sampling rate : 48.0 kHz
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Frame rate : 46.875 FPS (1024 SPF)
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Compression mode : Lossy
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Stream size : 36.9 MiB (1%)
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Title : Track1
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Default : Yes
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Alternate group : 1
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```
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### Test Image
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## CRF 21 [19.9 Mb/s]
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`ffmpeg -i "$input" -metadata comment="x264 CRF 21" -movflags +faststart -c:v libx264 -preset slower -crf 21 "$output"`
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### Mediainfo
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```
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General
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Complete name : CRF 21.mp4
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Format : MPEG-4
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Format profile : Base Media
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Codec ID : isom (isom/iso2/avc1/mp41)
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File size : 2.25 GiB
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Duration : 16 min 12 s
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Overall bit rate : 19.9 Mb/s
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Writing application : Lavf58.45.100
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Video
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ID : 1
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Format : AVC
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Format/Info : Advanced Video Codec
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Format profile : High@L5.1
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Format settings : CABAC / 8 Ref Frames
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Format settings, CABAC : Yes
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Format settings, Reference frames : 8 frames
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Codec ID : avc1
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Codec ID/Info : Advanced Video Coding
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Duration : 16 min 12 s
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Bit rate : 19.8 Mb/s
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Width : 2 560 pixels
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Height : 1 440 pixels
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Display aspect ratio : 16:9
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Frame rate mode : Constant
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Frame rate : 60.000 FPS
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Color space : YUV
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Chroma subsampling : 4:2:0
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Bit depth : 8 bits
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Scan type : Progressive
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Bits/(Pixel*Frame) : 0.089
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Stream size : 2.24 GiB (99%)
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Writing library : x264 core 160 r3011 cde9a93
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Encoding settings : cabac=1 / ref=8 / deblock=1:0:0 / analyse=0x3:0x133 / me=umh / subme=9 / psy=1 / psy_rd=1.00:0.00 / mixed_ref=1 / me_range=16 / chroma_me=1 / trellis=2 / 8x8dct=1 / cqm=0 / deadzone=21,11 / fast_pskip=1 / chroma_qp_offset=-2 / threads=24 / lookahead_threads=2 / sliced_threads=0 / nr=0 / decimate=1 / interlaced=0 / bluray_compat=0 / constrained_intra=0 / bframes=3 / b_pyramid=2 / b_adapt=2 / b_bias=0 / direct=3 / weightb=1 / open_gop=0 / weightp=2 / keyint=250 / keyint_min=25 / scenecut=40 / intra_refresh=0 / rc_lookahead=60 / rc=crf / mbtree=1 / crf=21.0 / qcomp=0.60 / qpmin=0 / qpmax=69 / qpstep=4 / ip_ratio=1.40 / aq=1:1.00
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Codec configuration box : avcC
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Audio
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ID : 2
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Format : AAC LC
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Format/Info : Advanced Audio Codec Low Complexity
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Codec ID : mp4a-40-2
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Duration : 16 min 12 s
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Bit rate mode : Constant
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Bit rate : 129 kb/s
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Channel(s) : 2 channels
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Channel layout : L R
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Sampling rate : 48.0 kHz
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Frame rate : 46.875 FPS (1024 SPF)
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Compression mode : Lossy
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Stream size : 14.9 MiB (1%)
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Default : Yes
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Alternate group : 1
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```
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### Test Image
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## CRF 27 [10.3 Mb/s]
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`ffmpeg -i "$input" -metadata comment="x264 CRF 27" -movflags +faststart -c:v libx264 -preset slower -crf 27 "$output"`
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### Mediainfo
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```
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General
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Complete name : CRF 27.mp4
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Format : MPEG-4
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Format profile : Base Media
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Codec ID : isom (isom/iso2/avc1/mp41)
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File size : 1.17 GiB
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Duration : 16 min 12 s
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Overall bit rate : 10.3 Mb/s
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Writing application : Lavf59.9.102
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Video
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ID : 1
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Format : AVC
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Format/Info : Advanced Video Codec
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Format profile : High@L5.1
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Format settings : CABAC / 8 Ref Frames
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Format settings, CABAC : Yes
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Format settings, Reference frames : 8 frames
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Codec ID : avc1
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Codec ID/Info : Advanced Video Coding
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Duration : 16 min 12 s
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Bit rate : 10.2 Mb/s
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Width : 2 560 pixels
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Height : 1 440 pixels
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Display aspect ratio : 16:9
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Frame rate mode : Constant
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Frame rate : 60.000 FPS
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Color space : YUV
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Chroma subsampling : 4:2:0
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Bit depth : 8 bits
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Scan type : Progressive
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Bits/(Pixel*Frame) : 0.046
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Stream size : 1.15 GiB (99%)
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Writing library : x264 core 164 r3075 66a5bc1
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Encoding settings : cabac=1 / ref=8 / deblock=1:0:0 / analyse=0x3:0x133 / me=umh / subme=9 / psy=1 / psy_rd=1.00:0.00 / mixed_ref=1 / me_range=16 / chroma_me=1 / trellis=2 / 8x8dct=1 / cqm=0 / deadzone=21,11 / fast_pskip=1 / chroma_qp_offset=-2 / threads=24 / lookahead_threads=2 / sliced_threads=0 / nr=0 / decimate=1 / interlaced=0 / bluray_compat=0 / constrained_intra=0 / bframes=3 / b_pyramid=2 / b_adapt=2 / b_bias=0 / direct=3 / weightb=1 / open_gop=0 / weightp=2 / keyint=250 / keyint_min=25 / scenecut=40 / intra_refresh=0 / rc_lookahead=60 / rc=crf / mbtree=1 / crf=27.0 / qcomp=0.60 / qpmin=0 / qpmax=69 / qpstep=4 / ip_ratio=1.40 / aq=1:1.00
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Color range : Limited
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Color primaries : BT.709
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Transfer characteristics : BT.709
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Matrix coefficients : BT.709
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Codec configuration box : avcC
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Audio
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ID : 2
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Format : AAC LC
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Format/Info : Advanced Audio Codec Low Complexity
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Codec ID : mp4a-40-2
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Duration : 16 min 12 s
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Source duration : 16 min 12 s
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Bit rate mode : Constant
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Bit rate : 132 kb/s
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Channel(s) : 2 channels
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Channel layout : L R
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Sampling rate : 48.0 kHz
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Frame rate : 46.875 FPS (1024 SPF)
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Compression mode : Lossy
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Stream size : 15.2 MiB (1%)
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Source stream size : 15.2 MiB (1%)
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Default : Yes
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Alternate group : 1
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mdhd_Duration : 972629
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```
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### Test Image
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## 1080p CRF 21 [11.9 Mb/s]
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`ffmpeg -i "$input" -metadata comment="x264 1080p CRF 21" -movflags +faststart -vf scale=1920:1080 -c:v libx264 -preset slower -crf 21 "$output"`
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### Mediainfo
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```
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General
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Complete name : 1080p CRF 21.mp4
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Format : MPEG-4
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Format profile : Base Media
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Codec ID : isom (isom/iso2/avc1/mp41)
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File size : 1.35 GiB
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Duration : 16 min 12 s
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Overall bit rate : 11.9 Mb/s
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Writing application : Lavf58.45.100
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Video
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ID : 1
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Format : AVC
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Format/Info : Advanced Video Codec
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Format profile : High@L5
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Format settings : CABAC / 8 Ref Frames
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Format settings, CABAC : Yes
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Format settings, Reference frames : 8 frames
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Codec ID : avc1
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Codec ID/Info : Advanced Video Coding
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Duration : 16 min 12 s
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Bit rate : 11.8 Mb/s
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Width : 1 920 pixels
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Height : 1 080 pixels
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Display aspect ratio : 16:9
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Frame rate mode : Constant
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Frame rate : 60.000 FPS
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Color space : YUV
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Chroma subsampling : 4:2:0
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Bit depth : 8 bits
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Scan type : Progressive
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Bits/(Pixel*Frame) : 0.095
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Stream size : 1.33 GiB (99%)
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Writing library : x264 core 160 r3011 cde9a93
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Encoding settings : cabac=1 / ref=8 / deblock=1:0:0 / analyse=0x3:0x133 / me=umh / subme=9 / psy=1 / psy_rd=1.00:0.00 / mixed_ref=1 / me_range=16 / chroma_me=1 / trellis=2 / 8x8dct=1 / cqm=0 / deadzone=21,11 / fast_pskip=1 / chroma_qp_offset=-2 / threads=24 / lookahead_threads=2 / sliced_threads=0 / nr=0 / decimate=1 / interlaced=0 / bluray_compat=0 / constrained_intra=0 / bframes=3 / b_pyramid=2 / b_adapt=2 / b_bias=0 / direct=3 / weightb=1 / open_gop=0 / weightp=2 / keyint=250 / keyint_min=25 / scenecut=40 / intra_refresh=0 / rc_lookahead=60 / rc=crf / mbtree=1 / crf=21.0 / qcomp=0.60 / qpmin=0 / qpmax=69 / qpstep=4 / ip_ratio=1.40 / aq=1:1.00
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Codec configuration box : avcC
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Audio
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ID : 2
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Format : AAC LC
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Format/Info : Advanced Audio Codec Low Complexity
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Codec ID : mp4a-40-2
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Duration : 16 min 12 s
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Bit rate mode : Constant
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Bit rate : 129 kb/s
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Channel(s) : 2 channels
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Channel layout : L R
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Sampling rate : 48.0 kHz
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Frame rate : 46.875 FPS (1024 SPF)
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Compression mode : Lossy
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Stream size : 14.9 MiB (1%)
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Default : Yes
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Alternate group : 1
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```
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### Test Image
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## 1080p CRF 27 [6,232 kb/s]
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`ffmpeg -i "$input" -metadata comment="x264 1080p CRF 27" -movflags +faststart -vf scale=1920:1080 -c:v libx264 -preset slower -crf 27 "$output"`
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Our test file described in the [Get Video Info](#get-video-info-with-mediainfo) section was compressed from 40.5 Mbps (over 16m12s) to
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### Mediainfo
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```
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General
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Complete name : ffmpeg test file - 1080p crf 27.mp4
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Format : MPEG-4
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Format profile : Base Media
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Codec ID : isom (isom/iso2/avc1/mp41)
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File size : 723 MiB
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Duration : 16 min 12 s
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Overall bit rate : 6 232 kb/s
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Writing application : Lavf58.45.100
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Video
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ID : 1
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Format : AVC
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Format/Info : Advanced Video Codec
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Format profile : High@L5
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Format settings : CABAC / 8 Ref Frames
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Format settings, CABAC : Yes
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Format settings, Reference frames : 8 frames
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Codec ID : avc1
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Codec ID/Info : Advanced Video Coding
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Duration : 16 min 12 s
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Bit rate : 6 089 kb/s
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Width : 1 920 pixels
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Height : 1 080 pixels
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Display aspect ratio : 16:9
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Frame rate mode : Constant
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Frame rate : 60.000 FPS
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Color space : YUV
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Chroma subsampling : 4:2:0
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Bit depth : 8 bits
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Scan type : Progressive
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Bits/(Pixel*Frame) : 0.049
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Stream size : 706 MiB (98%)
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Writing library : x264 core 160 r3011 cde9a93
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Encoding settings : cabac=1 / ref=8 / deblock=1:0:0 / analyse=0x3:0x133 / me=umh / subme=9 / psy=1 / psy_rd=1.00:0.00 / mixed_ref=1 / me_range=16 / chroma_me=1 / trellis=2 / 8x8dct=1 / cqm=0 / deadzone=21,11 / fast_pskip=1 / chroma_qp_offset=-2 / threads=24 / lookahead_threads=2 / sliced_threads=0 / nr=0 / decimate=1 / interlaced=0 / bluray_compat=0 / constrained_intra=0 / bframes=3 / b_pyramid=2 / b_adapt=2 / b_bias=0 / direct=3 / weightb=1 / open_gop=0 / weightp=2 / keyint=250 / keyint_min=25 / scenecut=40 / intra_refresh=0 / rc_lookahead=60 / rc=crf / mbtree=1 / crf=27.0 / qcomp=0.60 / qpmin=0 / qpmax=69 / qpstep=4 / ip_ratio=1.40 / aq=1:1.00
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Codec configuration box : avcC
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Audio
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ID : 2
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Format : AAC LC
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Format/Info : Advanced Audio Codec Low Complexity
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Codec ID : mp4a-40-2
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Duration : 16 min 12 s
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Bit rate mode : Constant
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Bit rate : 129 kb/s
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Channel(s) : 2 channels
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Channel layout : L R
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Sampling rate : 48.0 kHz
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Frame rate : 46.875 FPS (1024 SPF)
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Compression mode : Lossy
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Stream size : 14.9 MiB (2%)
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Default : Yes
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Alternate group : 1
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```
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### Test Image
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## 720p CRF 21 [6,314 kb/s]
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`ffmpeg -i "$input" -metadata comment="x264 720p CRF 21" -movflags +faststart -vf scale=1280:720 -c:v libx264 -preset slower -crf 21 "$output"`
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### Mediainfo
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```
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General
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Complete name : 720p CRF 21.mp4
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Format : MPEG-4
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Format profile : Base Media
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Codec ID : isom (isom/iso2/avc1/mp41)
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File size : 732 MiB
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Duration : 16 min 12 s
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Overall bit rate : 6 314 kb/s
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Writing application : Lavf59.9.102
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Video
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ID : 1
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Format : AVC
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Format/Info : Advanced Video Codec
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Format profile : High@L4
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Format settings : CABAC / 8 Ref Frames
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Format settings, CABAC : Yes
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Format settings, Reference frames : 8 frames
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Codec ID : avc1
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Codec ID/Info : Advanced Video Coding
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Duration : 16 min 12 s
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Bit rate : 6 169 kb/s
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Width : 1 280 pixels
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Height : 720 pixels
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Display aspect ratio : 16:9
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Frame rate mode : Constant
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Frame rate : 60.000 FPS
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Color space : YUV
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Chroma subsampling : 4:2:0
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|
Bit depth : 8 bits
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Scan type : Progressive
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|
Bits/(Pixel*Frame) : 0.112
|
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Stream size : 715 MiB (98%)
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Writing library : x264 core 164 r3075 66a5bc1
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Encoding settings : cabac=1 / ref=8 / deblock=1:0:0 / analyse=0x3:0x133 / me=umh / subme=9 / psy=1 / psy_rd=1.00:0.00 / mixed_ref=1 / me_range=16 / chroma_me=1 / trellis=2 / 8x8dct=1 / cqm=0 / deadzone=21,11 / fast_pskip=1 / chroma_qp_offset=-2 / threads=22 / lookahead_threads=1 / sliced_threads=0 / nr=0 / decimate=1 / interlaced=0 / bluray_compat=0 / constrained_intra=0 / bframes=3 / b_pyramid=2 / b_adapt=2 / b_bias=0 / direct=3 / weightb=1 / open_gop=0 / weightp=2 / keyint=250 / keyint_min=25 / scenecut=40 / intra_refresh=0 / rc_lookahead=60 / rc=crf / mbtree=1 / crf=21.0 / qcomp=0.60 / qpmin=0 / qpmax=69 / qpstep=4 / ip_ratio=1.40 / aq=1:1.00
|
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Color range : Limited
|
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Color primaries : BT.709
|
|
Transfer characteristics : BT.709
|
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Matrix coefficients : BT.709
|
|
Codec configuration box : avcC
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Audio
|
|
ID : 2
|
|
Format : AAC LC
|
|
Format/Info : Advanced Audio Codec Low Complexity
|
|
Codec ID : mp4a-40-2
|
|
Duration : 16 min 12 s
|
|
Source duration : 16 min 12 s
|
|
Bit rate mode : Constant
|
|
Bit rate : 132 kb/s
|
|
Channel(s) : 2 channels
|
|
Channel layout : L R
|
|
Sampling rate : 48.0 kHz
|
|
Frame rate : 46.875 FPS (1024 SPF)
|
|
Compression mode : Lossy
|
|
Stream size : 15.2 MiB (2%)
|
|
Source stream size : 15.2 MiB (2%)
|
|
Default : Yes
|
|
Alternate group : 1
|
|
mdhd_Duration : 972629
|
|
```
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|
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### Test Image
|
|
|
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|
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## 720p CRF 27 [3,305 kb/s]
|
|
`ffmpeg -i "$input" -metadata comment="x264 720p CRF 27" -movflags +faststart -vf scale=1280:720 -c:v libx264 -preset slower -crf 27 "$output"`
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|
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### Mediainfo
|
|
```
|
|
General
|
|
Complete name : 720p CRF 27.mp4
|
|
Format : MPEG-4
|
|
Format profile : Base Media
|
|
Codec ID : isom (isom/iso2/avc1/mp41)
|
|
File size : 383 MiB
|
|
Duration : 16 min 12 s
|
|
Overall bit rate : 3 305 kb/s
|
|
Writing application : Lavf58.45.100
|
|
|
|
Video
|
|
ID : 1
|
|
Format : AVC
|
|
Format/Info : Advanced Video Codec
|
|
Format profile : High@L4
|
|
Format settings : CABAC / 8 Ref Frames
|
|
Format settings, CABAC : Yes
|
|
Format settings, Reference frames : 8 frames
|
|
Codec ID : avc1
|
|
Codec ID/Info : Advanced Video Coding
|
|
Duration : 16 min 12 s
|
|
Bit rate : 3 162 kb/s
|
|
Width : 1 280 pixels
|
|
Height : 720 pixels
|
|
Display aspect ratio : 16:9
|
|
Frame rate mode : Constant
|
|
Frame rate : 60.000 FPS
|
|
Color space : YUV
|
|
Chroma subsampling : 4:2:0
|
|
Bit depth : 8 bits
|
|
Scan type : Progressive
|
|
Bits/(Pixel*Frame) : 0.057
|
|
Stream size : 367 MiB (96%)
|
|
Writing library : x264 core 160 r3011 cde9a93
|
|
Encoding settings : cabac=1 / ref=8 / deblock=1:0:0 / analyse=0x3:0x133 / me=umh / subme=9 / psy=1 / psy_rd=1.00:0.00 / mixed_ref=1 / me_range=16 / chroma_me=1 / trellis=2 / 8x8dct=1 / cqm=0 / deadzone=21,11 / fast_pskip=1 / chroma_qp_offset=-2 / threads=22 / lookahead_threads=1 / sliced_threads=0 / nr=0 / decimate=1 / interlaced=0 / bluray_compat=0 / constrained_intra=0 / bframes=3 / b_pyramid=2 / b_adapt=2 / b_bias=0 / direct=3 / weightb=1 / open_gop=0 / weightp=2 / keyint=250 / keyint_min=25 / scenecut=40 / intra_refresh=0 / rc_lookahead=60 / rc=crf / mbtree=1 / crf=27.0 / qcomp=0.60 / qpmin=0 / qpmax=69 / qpstep=4 / ip_ratio=1.40 / aq=1:1.00
|
|
Codec configuration box : avcC
|
|
|
|
Audio
|
|
ID : 2
|
|
Format : AAC LC
|
|
Format/Info : Advanced Audio Codec Low Complexity
|
|
Codec ID : mp4a-40-2
|
|
Duration : 16 min 12 s
|
|
Bit rate mode : Constant
|
|
Bit rate : 129 kb/s
|
|
Channel(s) : 2 channels
|
|
Channel layout : L R
|
|
Sampling rate : 48.0 kHz
|
|
Frame rate : 46.875 FPS (1024 SPF)
|
|
Compression mode : Lossy
|
|
Stream size : 14.9 MiB (4%)
|
|
Default : Yes
|
|
Alternate group : 1
|
|
```
|
|
### Test Image
|
|
|
|
|
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|
|
# Test a New Profile
|
|
0. Name the profile. `profile="<profile name>"` (E.g. "720p CRF 21")
|
|
1. Transcode the file. `ffmpeg -i "original.mp4" <transcode settings> "$profile.mp4"`
|
|
2. Extract sample frame from transcoded file. `ffmpeg -ss 00:15:20.01 -i "$profile.mp4" -frames:v 1 "$profile.png"`
|
|
3. Print media info for the new file. `mediainfo "$profile.mp4"`
|
|
4. Update this doc! |