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• FFMPEG - force webm clusters duration [closed]

  1er avril 2021, par Vlad Sineok

  in short, i'm modifying a game that uses a VP8 video format.
the original videos are at 25 fps and have all clusters of nice and perfect duration 0.96 seconds and contain 25 blocks each (except for that last cluster, which usually varies). also every cluster starts with a keyframe. (all that information i gathered using webm_info from google's libwebm repo)

  


  unless all of the requirements are met, the game struggles to play the webm file smoothly, so my own webm files stutter most of the time, because ffmpeg fails to create the correct clusters and mkclean doesn't help either.
so my question is : how would i force ffmpeg to make all clusters have that perfect duration ?
here's what my command currently looks like

  


  for %%f in (*.webm) do (
ffmpeg -y -i %%f -vcodec libvpx -cpu-used 1 -pass 1 -reserve_index_space 16384 -fflags +genpts -crf 15 -slices 8 -g 25 -keyint_min 25 -vprofile 1 -auto-alt-ref 1 -arnr-maxframes 5 -arnr-strength 3 -deadline good -vf scale=512:384,setsar=1:1 -vb 4000k -an -r 25 -movflags use_metadata_tags -f webm NUL && ^
ffmpeg -y -i %%f -vcodec libvpx -cpu-used 1 -pass 2 -reserve_index_space 16384 -fflags +genpts -crf 15 -slices 8 -g 25 -keyint_min 25 -vprofile 1 -auto-alt-ref 1 -arnr-maxframes 5 -arnr-strength 3 -deadline good -vf scale=512:384,setsar=1:1 -vb 4000k -an -r 25 -movflags use_metadata_tags -f webm %%~nf.webm
)


  


• How to handle FFMPEG module missing probe inside docker ?

  2 avril 2021, par DarkFantasy

  I am AWARE of how to solve this problem of missing problem module with spleeter on WINDOWS. Here is the solution
https://github.com/deezer/spleeter/issues/101

  


  How can I achieve the same inside my docker container ? In my docker file, the FFMPEG is being installed but it is missing the probe module. This is a common problem but one that I don't know how to solve inside of Docker.

  


  I tried doing

  


  RUN apt-get install -y ffmpeg
RUN pip uninstall ffmpeg-python
RUN pip install -r requirements.txt


  


  in my docker file but didn't work. The thing is, it was all working until last night. Today morning, I am getting this error when I rebuilt my docker image. Any help is appreciated.

  


• avformat/matroskaenc : Check chapter ids for duplicates

  15 mars 2021, par Andreas Rheinhardt

  avformat/matroskaenc : Check chapter ids for duplicates
  Up until now, there has been no check that each chapter has a unique id ;
  
  there was only a check for whether a chapter id is zero (this happens
  
  often when the chapters originated from a format that lacks the concept
  
  of chapter id and simply counts from zero) which is invalid in Matroska.
  
  In this case the chapter ids are offset by 1 to make them nonnegative.
  
  Yet offsetting won't fix duplicate ids, therefore this is changed to
  
  simply create new chapter uids when the input chapter uids don't conform
  
  to the requirements of Matroska (in which case it can be presumed that
  
  they did not originate from Matroska, so that we don't need to bother
  
  to preserve them).
  Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
  

  • [DH] libavformat/matroskaenc.c