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AVideo

https://ffmpeg.org/documentation.html
https://ffmpeg.org/ffmpeg-filters.html

https://www.codeproject.com/Tips/5356341/

FFmpeg A/V

• Change aspect ratio

  ffmpeg -y -i "input.mp4" -aspect "4:3" -c copy "output.mp4"

• Get a 1 min sample from 2 min of the beginning

  ffmpeg -y -ss 00:02:00 -i "input.mp4" -t 00:01:00 -c copy "output.mp4"

• Get a 1 min sample with audio only

  ffmpeg -y -ss 00:02:00 -i "input.mp4" -t 00:01:00 -map 0:1 -c copy "output.mp4"

• Get a 1 min samle with video only

  ffmpeg -y -ss 00:02:00 -i "input.mp4" -t 00:01:00 -map 0:0 -c copy "output.mp4"

• Get file informations

  ffprobe -hide_banner "input.mp4"

  ffprobe -v quiet -show_format -show_streams "input.mp4"

FFmpeg Audio

• Mp3 encoding

  ffmpeg -y -i "input.m4a" -c:a libmp3lame -b:a 192k "output.mp3"

• Keep left channel

  ffmpeg -y -i "input.mp4" -c:v copy -c:a libmp3lame -b:a 192k -af "pan=stereo|c0=c0|c1=c0" "output.mp4"

• Keep right channel

  ffmpeg -y -i "input.mp4" -c:v copy -c:a libmp3lame -b:a 192k -af "pan=stereo|c0=c1|c1=c1" "output.mp4"

• Audio normalize

  http://superuser.com/questions/323119/

  Analyze audio level with volumedetect

  ffmpeg -y -i "input.mp4" -af "volumedetect" -f null /dev/null

  Read "max_volume", for example -22.5 dB, then amplify audio channel by +22.5dB.

  ffmpeg -y -i "input.mp4" -c:v copy -c:a libmp3lame -b:a 192k -af "volume=22.5dB" "output.mp4"

• Advance or delay audio by one second

  ffmpeg -y -i "input.mp4" -itsoffset -1.0 -i "input.mp4" -map 0:0 -map 1:1 -c copy "output.mp4"

  ffmpeg -y -i "input.mp4" -itsoffset +1.0 -i "input.mp4" -map 0:0 -map 1:1 -c copy "output.mp4"

• Choose default audio channel

  ffmpeg -y -i "input.mp4" -map 0:0 -map 0:2 -map 0:1 \
  -disposition:a:0 default -disposition:a:1 none -c copy "output.mp4"
  

• Change audio speed

  ffmpeg -y -i "audio.mp3" -af "atempo=1.001" -b:a 192k "audio-faster.mp3"

• Audio filter

  ffmpeg -y -i "input.mp4" -c:v copy -af "highpass=f=100" "output.mp4"

FFmpeg Images

• Resize image

  ffmpeg -hide_banner -loglevel error -y \
  -i "input.jpg" -q:v 1 -vf scale=1680:1050:flags=lanczos "output.jpg"
  

mpv

https://www.reddit.com/r/linuxquestions/comments/clyt9z/  

In mpv.conf : `ytdl-format=bestvideo[height<=?480]+bestaudio/best`

Subtitles

• Convert sub to srt online

  https://subtitletools.com/convert-sub-idx-to-srt-online

• Extract subs with MKVToolNix

  mkvextract tracks "input.mkv" 2:out.idx

• Remove subtitles and chapters

  ffmpeg -y -i "input.mp4" -c copy -sn "output.mp4"

  ffmpeg -y -i "input.mp4" -c copy -map_chapters -1 "output.mp4"

  ffmpeg -y -i "input.mp4" -c copy -dn -map_metadata:c -1 "output.mp4"

yt-dlp

• Download subtitles from YouTube

  yt-dlp --list-subs "URL"
  yt-dlp --write-sub --sub-lang en --skip-download "URL"
  yt-dlp --write-sub --convert-subs=srt --skip-download "URL"
  yt-dlp --write-auto-sub --sub-lang fr --skip-download "URL"
  

• Download thumbnail

  yt-dlp --write-thumbnail --skip-download "URL"

• Use cookies

  yt-dlp --cookies=cookies/youtube.txt "URL"

Other

• Concatenating files

  https://stackoverflow.com/questions/7333232/
  https://trac.ffmpeg.org/wiki/Concatenate

  Create a file containing the list of files to concatenate :

  file 'part1.mp4'
  file 'part2.mp4'
  file 'part3.mp4'
  

  Then execute the concat command :

  ffmpeg -f concat -safe 0 -i "input.txt" -c copy "output.mp4"

• Write title metadata

  ffmpeg -y -i "input.mp4" -c copy -metadata title="Test title" "output.mp4"