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• How to use FFmpeg Colorspace Options

  13 octobre 2024, par Matt McManis

  I'm trying to understand the difference between Colorspace FFmpeg arguments :

  


  

  • Normal option, -colorspace bt709

  


  • Number, -colorspace 1

  


  • Codec Params -x264-params "colorspace=bt709"

  


  • Filter -vf "colorspace=bt709"

  


  


  The Colorspace categories are :

  


  

  • all

  


  • iall

  


  • colorspace

  


  • transfer

  


  • primaries

  


  • color range

  


  • color matrix

  


  


  ---

  


  Question

  


  When should each be used when encoding from raw, or transcoding/converting from one format to another ? Such as mpg to mp4.

  


  Do I need to specify the input colorspace or will FFmpeg auto-detect ?

  


  ---

  


  Problems

  


  There is no -vp8-params, only -x264-params. Should I use normal options or -vf instead for vp8 and other codecs ?

  


  ---

  


  Errors

  


  


  • There are no Normal -all or -colormatrix options, but there are all= and colormatrix= for -x264-params and -vf.

    


  


  • With Codec Params -x264-params "colorspace=bt709", I get Error parsing option 'colorspace = bt709'.
    
However colorprim=bt709, transfer=bt709, colormatrix=bt709 all work.

    


  


  


  ---

  


  Resources

  


  https://ffmpeg.org/ffmpeg-filters.html#colormatrix
  
https://ffmpeg.org/ffmpeg-filters.html#colorspace
  
https://trac.ffmpeg.org/wiki/colorspace

  


• FFMPEG Container ERROR Playback cannot continue. No available working or supported playlists [closed]

  14 septembre 2023, par NormalUser

  I tried to convert a mkv video to hls with a docker container, I get the error message "Playback cannot continue. No available working or supported playlists.". But when I did it without the docker container video.js could play it too, probably I forgot an important line ?
Docker code

  


  docker run --rm \
  -v /mnt:/config \
  linuxserver/ffmpeg \
  -i /config/input.mkv \
  -c:v copy \
  -c:a copy \
  -sn \
  -f hls \
  -hls_list_size 0 \
  /config/homepage/assets/hls/videos/output.m3u8


  


  Normal command

  


  ffmpeg -i input.mkv -c:v h264 -master_pl_name master.m3u8 -hls_time 10 -hls_list_size 0 -f hls -map 0 -c:a aac -b:a 128k -strict -2 -vf "subtitles=input.mkv" -map a -map v -map s -var_stream_map "a:0,v:0,s:0 a:1,v:1 s:1" test/stream_%v.m3u8


  


  The result of the docker format can not be played in the browser but with vlc, with the normal command it is the other way around, on the web page yes, vlc no.
there is no need to look at the directory structure, it works.
Is the Syntax right ?

  


• How to detect noisy R channel in ffmpeg ? [closed]

  17 novembre 2024, par davidvankemenade

  Does anyone know how ffmpeg can identify that the R channel in the example below is noisy ?

  


  waveform : noisy R channel
flac file with noisy R channel

  


  For reference, the following file's R channel is not noisy (except from the first few seconds) :

  


  waveform : normal R channel
flac file with normal R channel

  


  How could ffmpeg be used to classify the first file as "poor" and the second file as "OK" ?

  


  I've not yet been able to find an example to solve this problem.