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Create ffmpeg notes. With images.

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# Table of Contents
- [Table of Contents](#table-of-contents)
- [About ffmpeg](#about-ffmpeg)
- [Get Video Info with `mediainfo`](#get-video-info-with-mediainfo)
- [Get Test Image with ffmpeg](#get-test-image-with-ffmpeg)
- [Batch-ify ffmpeg Command](#batch-ify-ffmpeg-command)
- [Transcode Profiles](#transcode-profiles)
- [Original [40.3 Mb/s]](#original-403-mbs)
- [Mediainfo](#mediainfo)
- [Test Image](#test-image)
- [CRF 21 [19.9 Mb/s]](#crf-21-199-mbs)
- [Mediainfo](#mediainfo-1)
- [Test Image](#test-image-1)
- [CRF 27 [10.3 Mb/s]](#crf-27-103-mbs)
- [Mediainfo](#mediainfo-2)
- [Test Image](#test-image-2)
- [1080p CRF 21 [11.9 Mb/s]](#1080p-crf-21-119-mbs)
- [Mediainfo](#mediainfo-3)
- [Test Image](#test-image-3)
- [1080p CRF 27 [6,232 kb/s]](#1080p-crf-27-6232-kbs)
- [Mediainfo](#mediainfo-4)
- [Test Image](#test-image-4)
- [720p CRF 21 [6,314 kb/s]](#720p-crf-21-6314-kbs)
- [Mediainfo](#mediainfo-5)
- [Test Image](#test-image-5)
- [720p CRF 27 [3,305 kb/s]](#720p-crf-27-3305-kbs)
- [Mediainfo](#mediainfo-6)
- [Test Image](#test-image-6)
- [Test a New Profile](#test-a-new-profile)
# About ffmpeg
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/).
# Get Video Info with `mediainfo`
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).
To install on Debian, run `sudo apt install mediainfo`.
To get comprehensive media information about a file, simply use `mediainfo <file>`.
# Get Test Image with ffmpeg
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"`.
# Batch-ify ffmpeg Command
For a given `ffmpeg -i $video <do stuff>`, apply the command to all `.mp4` videos in a directory and send all outputs to `./Transcodes/` with the following structure:
```bash
for video in ./*.mp4
do
ffmpeg -i "$video" <do stuff> "Transcodes/${video%.*}.mp4"
done
```
# Transcode Profiles
## Original [40.3 Mb/s]
The pre-transcode data for the sample video. It was recorded using OBS with the following encoder settings at 1440p60:
| Parameter | Value |
|:---------:|:-----:|
| Rate Control | CBR |
| Bitrate | 40000 Kbps |
| Keyframe interval | 0s (auto) |
| Preset | Quality |
| Profile | high |
| Look-ahead | Yes |
| Psycho Visual Tuning | Yes |
| GPU | Nvidia RTX 3060 Ti |
| Max B-Frames | 2 |
### Mediainfo
```
General
Complete name : ffmpeg test file.mp4
Format : MPEG-4
Format profile : Base Media
Codec ID : isom (isom/iso2/avc1/mp41)
File size : 4.57 GiB
Duration : 16 min 12 s
Overall bit rate mode : Constant
Overall bit rate : 40.3 Mb/s
Writing application : Lavf59.16.100
Video
ID : 1
Format : AVC
Format/Info : Advanced Video Codec
Format profile : High@L5.1
Format settings : CABAC / 4 Ref Frames
Format settings, CABAC : Yes
Format settings, Reference frames : 4 frames
Codec ID : avc1
Codec ID/Info : Advanced Video Coding
Duration : 16 min 12 s
Source duration : 16 min 12 s
Bit rate mode : Constant
Bit rate : 40.0 Mb/s
Width : 2 560 pixels
Height : 1 440 pixels
Display aspect ratio : 16:9
Frame rate mode : Variable
Frame rate : 60.000 FPS
Minimum frame rate : 58.824 FPS
Maximum frame rate : 62.500 FPS
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Progressive
Bits/(Pixel*Frame) : 0.181
Stream size : 4.53 GiB (99%)
Source stream size : 4.53 GiB (99%)
Color range : Limited
Color primaries : BT.709
Transfer characteristics : BT.709
Matrix coefficients : BT.709
mdhd_Duration : 972666
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 : 318 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 : 36.9 MiB (1%)
Title : Track1
Default : Yes
Alternate group : 1
```
### Test Image
![Test Image - Original](img/ffmpeg/original.png)
## CRF 21 [19.9 Mb/s]
`ffmpeg -i "$input" -movflags +faststart -c:v libx264 -preset slower -crf 21 "$output"`
### Mediainfo
```
General
Complete name : CRF 21.mp4
Format : MPEG-4
Format profile : Base Media
Codec ID : isom (isom/iso2/avc1/mp41)
File size : 2.25 GiB
Duration : 16 min 12 s
Overall bit rate : 19.9 Mb/s
Writing application : Lavf58.45.100
Video
ID : 1
Format : AVC
Format/Info : Advanced Video Codec
Format profile : High@L5.1
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 : 19.8 Mb/s
Width : 2 560 pixels
Height : 1 440 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) : 0.089
Stream size : 2.24 GiB (99%)
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=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
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 (1%)
Default : Yes
Alternate group : 1
```
### Test Image
![Test Image - CRF 21](img/ffmpeg/CRF%2021.png)
## CRF 27 [10.3 Mb/s]
`ffmpeg -i "$input" -movflags +faststart -c:v libx264 -preset slower -crf 27 "$output"`
### Mediainfo
```
General
Complete name : CRF 27.mp4
Format : MPEG-4
Format profile : Base Media
Codec ID : isom (isom/iso2/avc1/mp41)
File size : 1.17 GiB
Duration : 16 min 12 s
Overall bit rate : 10.3 Mb/s
Writing application : Lavf59.9.102
Video
ID : 1
Format : AVC
Format/Info : Advanced Video Codec
Format profile : High@L5.1
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 : 10.2 Mb/s
Width : 2 560 pixels
Height : 1 440 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) : 0.046
Stream size : 1.15 GiB (99%)
Writing library : x264 core 164 r3075 66a5bc1
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
Color range : Limited
Color primaries : BT.709
Transfer characteristics : BT.709
Matrix coefficients : BT.709
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
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 (1%)
Source stream size : 15.2 MiB (1%)
Default : Yes
Alternate group : 1
mdhd_Duration : 972629
```
### Test Image
![Test Image - CRF 27](img/ffmpeg/CRF%2027.png)
## 1080p CRF 21 [11.9 Mb/s]
`ffmpeg -i "$input" -movflags +faststart -vf scale=1920:1080 -c:v libx264 -preset slower -crf 21 "$output"`
### Mediainfo
```
General
Complete name : 1080p CRF 21.mp4
Format : MPEG-4
Format profile : Base Media
Codec ID : isom (isom/iso2/avc1/mp41)
File size : 1.35 GiB
Duration : 16 min 12 s
Overall bit rate : 11.9 Mb/s
Writing application : Lavf58.45.100
Video
ID : 1
Format : AVC
Format/Info : Advanced Video Codec
Format profile : High@L5
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 : 11.8 Mb/s
Width : 1 920 pixels
Height : 1 080 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) : 0.095
Stream size : 1.33 GiB (99%)
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=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
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 (1%)
Default : Yes
Alternate group : 1
```
### Test Image
![Test Image - 1080p CRF 21](img/ffmpeg/1080p%20CRF%2021.png)
## 1080p CRF 27 [6,232 kb/s]
`ffmpeg -i "$input" -movflags +faststart -vf scale=1920:1080 -c:v libx264 -preset slower -crf 27 "$output"`
Our test file described in the [Get Video Info](#get-video-info-with-mediainfo) section was compressed from 40.5 Mbps (over 16m12s) to
### Mediainfo
```
General
Complete name : ffmpeg test file - 1080p crf 27.mp4
Format : MPEG-4
Format profile : Base Media
Codec ID : isom (isom/iso2/avc1/mp41)
File size : 723 MiB
Duration : 16 min 12 s
Overall bit rate : 6 232 kb/s
Writing application : Lavf58.45.100
Video
ID : 1
Format : AVC
Format/Info : Advanced Video Codec
Format profile : High@L5
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 : 6 089 kb/s
Width : 1 920 pixels
Height : 1 080 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) : 0.049
Stream size : 706 MiB (98%)
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=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
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 (2%)
Default : Yes
Alternate group : 1
```
### Test Image
![Test Image - 1080p CRF 27](img/ffmpeg/1080p%20crf%2027.png)
## 720p CRF 21 [6,314 kb/s]
`ffmpeg -i "$input" -movflags +faststart -vf scale=1280:720 -c:v libx264 -preset slower -crf 21 "$output"`
### Mediainfo
```
General
Complete name : 720p CRF 21.mp4
Format : MPEG-4
Format profile : Base Media
Codec ID : isom (isom/iso2/avc1/mp41)
File size : 732 MiB
Duration : 16 min 12 s
Overall bit rate : 6 314 kb/s
Writing application : Lavf59.9.102
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 : 6 169 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) : 0.112
Stream size : 715 MiB (98%)
Writing library : x264 core 164 r3075 66a5bc1
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
Color range : Limited
Color primaries : BT.709
Transfer characteristics : BT.709
Matrix coefficients : BT.709
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
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
```
### Test Image
![Test Image - 720p CRF 21](img/ffmpeg/720p%20CRF%2021.png)
## 720p CRF 27 [3,305 kb/s]
`ffmpeg -i "$input" -movflags +faststart -vf scale=1280:720 -c:v libx264 -preset slower -crf 27 "$output"`
### 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
![Test Image - 720p CRF 27](img/ffmpeg/720p%20CRF%2027.png)
# 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!

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