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• How to md5 the video track (only) in ffmpeg

  10 octobre 2024, par David542

  I have a .mov file with a video and several audio tracks. To md5 the entire file I can do :

  


  [pdev@d ~]$ md5sum 1_TRAILER_HD_2CH_ES419_ENSUB_16X9_178_2398_DIGITAL_FINAL.mov
042f0e177fe25f562079cc07208ec446


  


  Though when I try doing the same thing in ffmpeg, I get a different value :

  


  $ ffmpeg -i 1_TRAILER_HD_2CH_ES419_ENSUB_16X9_178_2398_DIGITAL_FINAL.mov -f md5 -
MD5=74bd904f1edb4eb1368040e2792d7497   0kB time=00:01:59.11 bitrate=   0.0kbits/s speed=2.36x
frame= 2867 fps= 56 q=-0.0 Lsize=       0kB time=00:01:59.57 bitrate=   0.0kbits/s speed=2.35x
video:23222700kB audio:22421kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown


  


  Why is the value different ? Additionally, how can I checksum only the video track ? I have various files that have different audio tracks and want to see if I have the same video track on those files.

  


  ---

  


  Update : I believe this answer shows how to compute an audio-only checksum, but not sure about video-only : https://superuser.com/a/1044419/118248.

  


• avformat/matroskadec : adjust the cluster time to the track timebase

  15 novembre 2020, par Steve Lhomme

  avformat/matroskadec : adjust the cluster time to the track timebase
  The Block timestamp read in matroska_parse_block() is in track timebase and is
  
  passed on as such to the AVPacket which uses this timebase.
  In the normal case the Cluster and Track timebases are the same because the
  
  track->time_scale is 1.0. But when it is not the case, the values in Cluster
  
  timebase need to be transformed in Track timebase so they can be added
  
  together.
  Signed-off-by : Anton Khirnov <anton@khirnov.net>
  

  • [DH] libavformat/matroskadec.c

• Replacing audio in section of a video with another track using ffmpeg

  3 décembre 2020, par b-rad15

  Basically I have a video with it's original audio, video.mp4 and a different audio, audio.ogg, between 30 seconds into the video and the length of the audio + 30 seconds (this calc I'd be willing do via probing the file but a better solution would also be appreciated for that)

  


  Assuming audio.ogg is 3 minutes long, I could do this now with a complex filter like ffmpeg -i video.mp4 -t 30 -i video.mp4 -ss 3:30 video.mp4 -i audio.mp3 -filter_complex '[1:a][3:a][2:a]concat=n=3:v=0:a=1[a]' -map '[a]' -map 0:v -c:v copy out.mp4 but is there a simple way than that like a different filter I'm missing ? I was even wondering if you could mute a section of time in the audio then simply overlay the new audio on that muted section