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• FFMPEG video conversion for pygame

  19 avril 2016, par Vladimir Shevyakov

  I am currently making a program on python (3) using the pygame module. One of the things I need it to do is to play a video which is currently in AVI format.

  From what I managed to understand from the pygame.movie documentation I have to use FFMPEG and not another program to convert the video to an MPEG (I tried it with NCH Prism and the result was quite memorable).

  I managed to convert my file to an MPG using the sample command found in the pygame.movie documentation (ffmpeg -i <infile> -vcodec mpeg1video -acodec libmp3lame -intra </infile>) but the video quality dropped very much. I tried looking at different cites but they never actually had a working example...

  Is there a way to keep the current video quality ? I don’t really care about the file size...

  Thanks in advance !

• intrax8 : Use local destination buffers

  20 février 2016, par Vittorio Giovara

  intrax8 : Use local destination buffers
  These buffers are just a way to store frame pointers and be able to
  
  modify them without touching the original ones.
  The two dependent decoders (WMV2 and VC1) do not need special care for
  
  these fields : the former does not seem to use the dest buffers, while
  
  the latter reinits them every time to the current frame data buffers.
  So only keep a local copy rather than the one from mpegvideo.
  

  • [DBH] libavcodec/intrax8.c
  • [DBH] libavcodec/intrax8.h

• Capture ffmpeg's metadata output in powershell

  17 mars 2016, par xdhmoore

  I’m trying to capture the output of ffmpeg in PowerShell(tm) to get some metadata on some ogg & mp3 files. But when I do :

  ffmpeg -i file.ogg 2>&1 | sls GENRE

  The output includes a bunch of lines without my matching string, "GENRE" :

        album_artist    : Post Human Era
  
        ARTIST          : Post Human Era
  
        COMMENT         : Visit http://posthumanera.bandcamp.com
  
        DATE            : 2013
  
        GENRE           : Music
  
        TITLE           : Supplies
  
        track           : 1
  
  At least one output file must be specified

  I am guessing something is different in the encoding. ffmpeg’s output is colored, so maybe there are color control characters in the output that are breaking things ? Or, maybe ffmpeg’s output isn’t playing nicely with powershell’s default UTF-16 ? I can’t figure out if there is another way to redirect stderr and remove the color characters or change the encoding of stderr.

  EDIT :
  Strangely, I also get indeterminate output. Sometimes the output is as shown above. Sometimes with precisely the same command the output is :

        GENRE           :

  

  Which makes slightly more sense, but is still missing the part of the line I care about (’Music’).

  Somewhere powershell is interpreting something as newlines that is not newlines.