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• Write mdat of mpeg-4 into mpeg-ts using ffmpeg

  20 juin 2013, par Ardoramor

  If I have an mp4 file with incomplete ftyp and moov but a valid mdat, can I write mdat frames into mpeg-ts ? Do I really need to get sps and pps if I do not plan to decode/encode ? Shouldn't it simply read/write frames from input stream into output stream ?

• Playing H.264 video in an application through ffmpeg using DXVA2 acceleration

  28 avril 2012, par cloudraven

  I am trying to output H.264 video in a Windows application. I am moderately familiar with FFMPEG and I have been successful at getting it to play H.264 in a SDL window without a problem. Still, I would really benefit from using Hardware Acceleration (probably through DXVA2)

  I am reading raw H264 video, no container, no audio ... just raw video (and no B-frames, just I and P). Also, I know that all the systems that will use this applications have Nvidia GPUs supporting at least VP3.
  Given that set of assumptions I was hoping to cut some corners, make it simple instead of general, just have it working for my particular scenario.

  So far I know that I need to set the hardware acceleration in the codec context by filling the hwaccel member through a call to ff_find_hwaccel. My plan is to look at Media Player Classic Home Cinema which does a pretty good job at supporting DXVA2 using FFMPEG when decoding H.264. However, the code is quite large and I am not exactly sure where to look. I can find the place where ff_find_hwaccel is called in h264.c, but I was wondering where else should I be looking at.

  More specifically, I would like to know what is the minimum set of steps that I have to code to get DXVA2 through FFMPEG working ?

  EDIT : I am open to look at VLC or anything else if someone knows where I can find the "important" piece of code that does the trick. I just mentioned MPC-HC because I think it is the easiest to get to compile in Windows.

• Evolution #2995 : Couleur du bouton "parcourir" sous IE9 presque invisible.

  12 mai 2013, par Franck Dalot

  il y a des chances qu’il faudrait plutôt faire un changement, de la couleur d’arrière plan dans ce cas là, s’il devait y avoir modification.
  Bon, cela dit, il n’y a pas mort d’homme non plus, mais cela faisait un moment que je voulais le dire, mais j’y pensais jamais :-D

  Suivant le navigateur, parfois le texte lui même change (parcourir/choisissez un fichier/choisir), par contre, là, je suppose que cela vient des navigateurs et non de spip.
  J’ai fait des captures d’écran :
  Chrome version 26.0.1410.64 m
  Firefox 20.0.1
  Opera 12.15

  cela m’a fait remarquer un autre truc (je vais faire un ticket pour ne pas tout mélanger)
  Franck