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• FFMPEG scaling video disable viewing it while process is not ended, for video transcoding on the fly

  5 juillet 2022, par Lucas F

  Good day all,

  


  I'm working on a video player with 1080p original video files, and I would like to change their resolution on the fly :

  


  Actually I host all my original video files under a web mp4 1080p format, and I would like to be able to offer 720p, 480p, etc ... qualities.

  


  So I started to look for tutorials about video transcoding on the fly and I found the FFMPEG tool.

  


  I'm actually using the following command to scale videos - to 720p for e.g. :

  


  ffmpeg -i input.mp4 -vf scale=-1:720 output.mp4


  


  The problem is, once FFMPEG starts scaling it, I have to wait the end of the process before being able to play the video. Do you know if there is any parameter for this command to allow playing the video while it's under scaling ?

  


  Or any workaround that can help me doing this ?

  


  Thank you in advance for your help !

  


  EDIT

  


  Now I found how to access readable content while transcoding (by transcoding to fragmented MP4) :

  


  ffmpeg -i input.mp4 -vf scale=-2:720 -movflags +frag_keyframe+separate_moof+omit_tfhd_offset+empty_moov output.mp4


  


  But my problem is when opening the video it comes as an "ended" video of the current transcoded data.

  


  So if video lasts 1min and is half transcoded, I'll see only 30s, it will not load more data, once the rest is transcoded.

  


• How to acurately trim audio and video with ffmpeg ? [closed]

  6 janvier 2024, par ws90

  I'm trying to automate the trimming and concatenation of video clips that also contain audio using ffmpeg.
The following commands are being used to trim clips and then concatenate the trimmed clips.

  


  .\ffmpeg -ss $startInSeconds -i $inputFile -t $partDurationInSeconds $outputFile


  


  This is done once per input file, the values of $startInSeconds and $partDurationInSeconds are different for different clips.

  


  .\ffmpeg -f concat -safe 0 -i .\list.txt -c copy $concatOutputFile


  


  list.txt is a list of $outputFile from the first trim command.

  


  The audio of the concat video file gradually de-syncs over time (slowing down compared to the trimmed clips), which is the problem I'm looking to fix.
It seems to slow down by about half a frame at each concat join.

  


  Why is the concat command causing this de-sync and what can I do about it ?

  


  I thought this was due to a mismatch in duration between the audio and video tracks of a trimmed clip (the audio would often be shorter than the video after trimming). I then tried padding the audio to match the video before concatenating but the problem persists.
I also found an example where the tracks were identical in length and the problem persists, so I think the concat command is the culprit, not the trim command.

  


• vdpau : add av_vdpau_bind_context()

  4 octobre 2014, par Rémi Denis-Courmont

  vdpau : add av_vdpau_bind_context()
  This function provides an explicit VDPAU device and VDPAU driver to
  
  libavcodec, so that the application is relieved from codec specifics
  
  and VdpDevice life cycle management.
  A stub flags parameter is added for future extension. For instance, it
  
  could be used to ignore codec level capabilities (if someone feels
  
  dangerous).
  Signed-off-by : Anton Khirnov <anton@khirnov.net>
  

  • [DBH] doc/APIchanges
  • [DBH] libavcodec/vdpau.c
  • [DBH] libavcodec/vdpau.h
  • [DBH] libavcodec/vdpau_internal.h
  • [DBH] libavcodec/version.h