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• Are there any resources listing current codecs and formats not supported by FFmpeg ?

  4 mars 2020, par Alexander Swann

  We are building a service where we do not know what format/codec a video uploaded by a user is in. Due to the nature of the application, we expect input video formats to be very fragmented, diverse and niche. We are currently using FFmpeg to transcode input formats to a consistent output (e.g. mp4).

  Due to the above scenario, I would like to establish a general list of what formats and codecs are not currently supported by FFmpeg. This is so I can research other open source video transcoding tools which I can utilise to fill in the gaps and allow our service to be more reliable for the user.

  Are there resources online that can help at least get a general idea of what might not be supported by FFmpeg ?

• How to trim a large video with ffmpeg ?

  5 août 2015, par slacker

  I am trying to trim a video that is 75 GB size and 1 hour and 28 minutes long

  I only want to get 7 seconds out of it

  When I try this

  ffmpeg -i Replay.mp4 -ss 01:21:24.0000 -to 01:21:32.0000 -acodec copy -vcodec copy ShortReplay2.mp4

  I get this

  Stream mapping:
  
    Stream #0:1 -> #0:0 (copy)
  
    Stream #0:0 -> #0:1 (copy)
  
  Press [q] to stop, [?] for help
  
  frame=    0 fps=0.0 q=-1.0 size=       0kB time=00:00:00.00 bitrate=N/A

  It’s stuck and nothing happens, have waited for about 30 minutes and is still stuck

  However when I try trimming it from the beginning of the video

  ffmpeg -i Replay.mp4 -ss 00:00:00.000 -to 00:20:00.000 -acodec copy -vcodec copy ShortReplay2.mp4

  It works without issues

  Is it because the file size is too big and the program takes too long to read it ? What can I do ?

• bash loop through list of file paths - characters get removed when sending to ffmpeg [duplicate]

  9 octobre 2018, par Brad Johnson

  This question already has an answer here :

  • Bash while loop stops for no reason ?
    
    1 answer
    

  I have a text file that contains a list of paths to flac files I want to convert to wav. Here is a small section of it :

  /mnt/nfs/Music/Rob D/1995 - Clubbed To Death/Rob D - 02 - Clubbed To Death _Kurayamino Variation_.flac
  
  /mnt/nfs/Music/Blonde Redhead/2000 - Melody of Certain Damaged Lemons/11 - For the Damaged Coda.flac
  
  /mnt/nfs/Music/I Monster/2001 - Daydream In Blue/01 - Daydream In Blue.flac
  
  /mnt/nfs/Music/Moby/2002 - Extreme Ways/01 - Extreme Ways.flac
  
  /mnt/nfs/Music/RJD2/2002 - Deadringer/01 - The Horror.flac
  
  /mnt/nfs/Music/RJD2/2002 - Deadringer/03 - Smoke & Mirrors.flac
  
  /mnt/nfs/Music/RJD2/2002 - Deadringer/06 - Ghostwriter.flac
  
  /mnt/nfs/Music/RJD2/2002 - Deadringer/10 - Chicken-Bone Circuit.flac
  
  /mnt/nfs/Music/FC Kahuna/2003 - Hayling/01 - Hayling _Original_.flac
  
  /mnt/nfs/Music/Lamb/2003 - Between Darkness and Wonder/04 - Angelica.flac

  I’m trying to loop through it like so :

  while read -r line; do
  
   wavfile=$(basename "$line")
  
   wavfile="${wavfile%.*}"
  
   ffmpeg -i "$line" "$2/$wavfile.wav"
  
  done <$1

  ...where $1 is where I would pass the name of the text file and $2 is the destination directory.

  Here is the output with the irrelevant ffmpeg junk pruned out :

  Input #0, flac, from '/mnt/nfs/Music/Rob D/1995 - Clubbed To Death/Rob D - 02 - Clubbed To Death _Kurayamino Variation_.flac':
  
  ...
  
  Output #0, wav, to '/mnt/gray/Clubbed To Death/Rob D - 02 - Clubbed To Death _Kurayamino Variation_.wav':
  
  ...
  
  /nfs/Music/Blonde Redhead/2000 - Melody of Certain Damaged Lemons/11 - For the Damaged Coda.flac: No such file or directory
  
  ...
  
  Input #0, flac, from '/mnt/nfs/Music/I Monster/2001 - Daydream In Blue/01 - Daydream In Blue.flac':
  
  ...
  
  Output #0, wav, to '/mnt/gray/Clubbed To Death/01 - Daydream In Blue.wav':
  
  ...
  
  nt/nfs/Music/Moby/2002 - Extreme Ways/01 - Extreme Ways.flac: No such file or directory
  
  ...
  
  Input #0, flac, from '/mnt/nfs/Music/RJD2/2002 - Deadringer/01 - The Horror.flac':
  
  ...
  
  Output #0, wav, to '/mnt/gray/Clubbed To Death/01 - The Horror.wav':
  
  ...
  
  nt/nfs/Music/RJD2/2002 - Deadringer/03 - Smoke & Mirrors.flac: No such file or directory
  
  ...
  
  Input #0, flac, from '/mnt/nfs/Music/RJD2/2002 - Deadringer/06 - Ghostwriter.flac':
  
  ...
  
  Output #0, wav, to '/mnt/gray/Clubbed To Death/06 - Ghostwriter.wav':
  
  ...
  
  nt/nfs/Music/RJD2/2002 - Deadringer/10 - Chicken-Bone Circuit.flac: No such file or directory
  
  ...
  
  Input #0, flac, from '/mnt/nfs/Music/FC Kahuna/2003 - Hayling/01 - Hayling _Original_.flac':
  
  ...
  
  Output #0, wav, to '/mnt/gray/Clubbed To Death/01 - Hayling _Original_.wav':
  
  ...
  
  /nfs/Music/Lamb/2003 - Between Darkness and Wonder/04 - Angelica.flac: No such file or directory

  If you pay attention to the paths that ffmpeg reports don’t exist, you’ll see that a seemingly random number of characters has been removed from the beginning. This appears to happen on even numbered lines, but odd numbered lines work. I can only reproduce this behavior when using ffmpeg. If I replace the ffmpeg line with a simple echo statement, every file path is shown to be correct. How can this be ?

  Other suggestions of accomplishing this are also welcome, however I do need the files processed in the order by which I have them listed in the file.