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• Anomalie #3398 : Date du thread modifiée lorsqu’un message de forum est soumis, sans tenir compte ...

  14 mai 2015, par marcimat ☺☮☯♫

  Complété par http://zone.spip.org/trac/spip-zone/changeset/89344 et http://zone.spip.org/trac/spip-zone/changeset/89345

• Debugging an MP4 opened by VLC but not by ffplay

  15 mai 2017, par MaMazav

  I’m writing a code which creates MP4 files. To check it I’ve created an MP4 file.

  The file is played correctly by VLC and Firefox, but not by ffplay or by Chrome. I guess the file contains error which VLC can cope with but more aggressive MP4 reader cannot.

  I’ve thought about repairing the file and check what are the differences to fix my code. However I tried some programs to repair MP4 files, without success until now.

  Can someone reccommend another way to debug the problem, or a good tool to fix MP4 files ? The file is a fragmented MP4 contains both the init section (ftyp, moov boxes) and one fragment section (moof and empty sidx).

  Here is the video file :

  https://www.dropbox.com/s/rojxzvkfxfj31u8/400k00001-3_serialized.mp4?dl=0

  EDIT : It doesn’t work also in Firefox, when using Media Source Extensions like in this example :
  http://people.mozilla.org/ jyavenard/tests/mse_mp4/paper.html

  (don’t forget to enable MSE on Firefox, as explained here :
  http://www.linuxveda.com/2015/04/02/enable-mse-native-html5-support-firefox-linux/)

  EDIT2 : In chrome ://media-internals, I see the following error with the above example :
  Append : stream parsing failed. Data size=131072 append_window_start=0 append_window_end=inf

  (Change the URL to be the file and change the codec to be ’avc1.4d401f’ instead of ’avc1.64000d,mp4a.40.2’).

• Where is the initialization of motion vector in source code ?

  3 novembre 2019, par Alex

  In IMPROVED RATE CONTROL AND MOTION ESTIMATION FOR H.264 ENCODER this paper introduce initialize with extra motion vector. I would like to try some other initialization methods, but I can not find where the initialization code realized.

  



  In encoder/me.c I can only find the function which uses mvc. But for where mv is initialized, I am get confused with the code.