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• FFMPEG - batch extracting media duration and writing to a text file

  5 décembre 2022, par lyrically wicked

  I have ten media files in a folder. I want to create a text file containing two columns - filename and its duration (seconds) :

  



  video1.mp4|300 seconds 
video2.mp4|360 seconds 
video3.mp4|420 seconds 
... 
audio10.wav|120 seconds 


  



  I did not find any similar question on the Web, so I don't have any hint of how to do this...

  


• Convert *.mov file to *.mp4 with media source support

  4 février 2017, par Yerzhan Torgayev

  My goal is to play converted *.mp4 file with HTML5 Media Source Extension (MSE).
  I made a small video with iMovie on my Mac and exported this video to *.mov file. Using ffmpeg I’ve converted *.mov file to fragmented *.mp4 file.
  I used code from Mozilla Media Source tutorial to make simple html5 video player.

  https://developer.mozilla.org/en-US/docs/Web/API/Media_Source_Extensions_API/Transcoding_assets_for_MSE

  But I couldn’t get my video played with this tutorial. Other *.mp4 videos play just fine. But I have troubles with converted *.mov videos.

  I’ve checked codec support for my video.
  On this page I’ve got my codec info :

  http://nickdesaulniers.github.io/mp4info/

  track #0 codec string: mp4v
  
  track #1 codec string: mp4a.40.2
  
  track #2 codec string: tmcd
  
  MediaSource.isTypeSupported('video/mp4; codecs="mp4v, mp4a.40.2, tmcd"'); // => false

  I found that tmcd codec is not supported by MSE :

  https://cconcolato.github.io/media-mime-support/

  I couldn’t find the way to get my video work with MSE. Can anyone help me with this issue ?

• ffmpeg API encoding mpeg-4 Windows Media Player error

  9 juin 2017, par user1505129

  We have an app that uses the ffmpeg C API to encode mpeg-4 (AV_CODEC_ID_MPEG4) files in a mp4 container. The problem is that the files don’t play in Windows Media Player or the Windows 10 video player "Movies & TV" app. It plays in VLC, google chrome, Ubuntu’s video player, and all other video players I’ve tried.

  The two Windows players are able to play other files encoded with mpeg-4 in mp4 container. I also tested transcoding video files to the same format using the command line ’ffmpeg’ tool and was successfully able to play the video using the following command :

  ffmpeg input.avi -c:v mpeg4 output.mp4

  While I found the following commands do not work :

  ffmpeg input.avi -c:v mpeg4 -vtag xvid output.mp4

  ffmpeg input.avi -c:v libxvid output.mp4

  # the last command wont play with windows media player but VLC can still play it.  If the extension of the output file is changed to avi for the last two commands then Windows media player can play it.

  I started looking at the ffmpeg src code but it appears a bit large/complex, I tried using the simpler "encode_video.c" example, which was able to encode a video and play it in Ubuntu’s default video player but VLC nor Windows Media Player could play it.

  We need to encode these using the ffmpeg API, not the command line tool, so I am wondering what the ffmpeg command line tool is doing that I am not, or any ideas on what the problem could be and how to get this working.

  Thanks.