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• lavf : replace AVStream.codec with AVStream.codecpar

  18 juin 2014, par Anton Khirnov

  lavf : replace AVStream.codec with AVStream.codecpar
  Currently, AVStream contains an embedded AVCodecContext instance, which
  
  is used by demuxers to export stream parameters to the caller and by
  
  muxers to receive stream parameters from the caller. It is also used
  
  internally as the codec context that is passed to parsers.
  In addition, it is also widely used by the callers as the decoding (when
  
  demuxer) or encoding (when muxing) context, though this has been
  
  officially discouraged since Libav 11.
  There are multiple important problems with this approach :
  
      - the fields in AVCodecContext are in general one of
  
          * stream parameters
  
          * codec options
  
          * codec state
  
        However, it’s not clear which ones are which. It is consequently
  
        unclear which fields are a demuxer allowed to set or a muxer allowed to
  
        read. This leads to erratic behaviour depending on whether decoding or
  
        encoding is being performed or not (and whether it uses the AVStream
  
        embedded codec context).
  
      - various synchronization issues arising from the fact that the same
  
        context is used by several different APIs (muxers/demuxers,
  
        parsers, bitstream filters and encoders/decoders) simultaneously, with
  
        there being no clear rules for who can modify what and the different
  
        processes being typically delayed with respect to each other.
  
      - avformat_find_stream_info() making it necessary to support opening
  
        and closing a single codec context multiple times, thus
  
        complicating the semantics of freeing various allocated objects in the
  
        codec context.
  Those problems are resolved by replacing the AVStream embedded codec
  
  context with a newly added AVCodecParameters instance, which stores only
  
  the stream parameters exported by the demuxers or read by the muxers.
  

  • [DBH] libavdevice/alsa.c
  • [DBH] libavdevice/alsa_dec.c
  • [DBH] libavdevice/alsa_enc.c
  • [DBH] libavdevice/bktr.c
  • [DBH] libavdevice/fbdev.c
  • [DBH] libavdevice/jack.c
  • [DBH] libavdevice/libcdio.c
  • [DBH] libavdevice/libdc1394.c
  • [DBH] libavdevice/oss_dec.c
  • [DBH] libavdevice/oss_enc.c
  • [DBH] libavdevice/pulse.c
  • [DBH] libavdevice/sndio_dec.c
  • [DBH] libavdevice/sndio_enc.c
  • [DBH] libavdevice/v4l2.c
  • [DBH] libavdevice/vfwcap.c
  • [DBH] libavdevice/x11grab.c
  • [DBH] libavdevice/xcbgrab.c
  • [DBH] libavformat/4xm.c
  • [DBH] libavformat/a64.c
  • [DBH] libavformat/aacdec.c
  • [DBH] libavformat/adtsenc.c
  • [DBH] libavformat/adxdec.c
  • [DBH] libavformat/aea.c
  • [DBH] libavformat/aiffdec.c
  • [DBH] libavformat/aiffenc.c
  • [DBH] libavformat/amr.c
  • [DBH] libavformat/anm.c
  • [DBH] libavformat/apc.c
  • [DBH] libavformat/ape.c
  • [DBH] libavformat/apetag.c
  • [DBH] libavformat/asfdec.c
  • [DBH] libavformat/asfenc.c
  • [DBH] libavformat/assdec.c
  • [DBH] libavformat/assenc.c
  • [DBH] libavformat/au.c
  • [DBH] libavformat/audiointerleave.c
  • [DBH] libavformat/avformat.h
  • [DBH] libavformat/avidec.c
  • [DBH] libavformat/avienc.c
  • [DBH] libavformat/avisynth.c
  • [DBH] libavformat/avs.c
  • [DBH] libavformat/bethsoftvid.c
  • [DBH] libavformat/bfi.c
  • [DBH] libavformat/bink.c
  • [DBH] libavformat/bmv.c
  • [DBH] libavformat/c93.c
  • [DBH] libavformat/cafdec.c
  • [DBH] libavformat/cdg.c
  • [DBH] libavformat/cdxl.c
  • [DBH] libavformat/dashenc.c
  • [DBH] libavformat/dauddec.c
  • [DBH] libavformat/daudenc.c
  • [DBH] libavformat/dfa.c
  • [DBH] libavformat/dsicin.c
  • [DBH] libavformat/dss.c
  • [DBH] libavformat/dump.c
  • [DBH] libavformat/dv.c
  • [DBH] libavformat/dvenc.c
  • [DBH] libavformat/dxa.c
  • [DBH] libavformat/eacdata.c
  • [DBH] libavformat/electronicarts.c
  • [DBH] libavformat/ffmetadec.c
  • [DBH] libavformat/filmstripdec.c
  • [DBH] libavformat/filmstripenc.c
  • [DBH] libavformat/flac_picture.c
  • [DBH] libavformat/flacdec.c
  • [DBH] libavformat/flacenc.c
  • [DBH] libavformat/flic.c
  • [DBH] libavformat/flvdec.c
  • [DBH] libavformat/flvenc.c
  • [DBH] libavformat/g722.c
  • [DBH] libavformat/g723_1.c
  • [DBH] libavformat/gif.c
  • [DBH] libavformat/gsmdec.c
  • [DBH] libavformat/gxf.c
  • [DBH] libavformat/gxfenc.c
  • [DBH] libavformat/hdsenc.c
  • [DBH] libavformat/hls.c
  • [DBH] libavformat/hlsenc.c
  • [DBH] libavformat/hnm.c
  • [DBH] libavformat/id3v2.c
  • [DBH] libavformat/id3v2enc.c
  • [DBH] libavformat/idcin.c
  • [DBH] libavformat/idroqdec.c
  • [DBH] libavformat/iff.c
  • [DBH] libavformat/ilbc.c
  • [DBH] libavformat/img2dec.c
  • [DBH] libavformat/img2enc.c
  • [DBH] libavformat/internal.h
  • [DBH] libavformat/ipmovie.c
  • [DBH] libavformat/isom.c
  • [DBH] libavformat/iss.c
  • [DBH] libavformat/iv8.c
  • [DBH] libavformat/ivfdec.c
  • [DBH] libavformat/ivfenc.c
  • [DBH] libavformat/jvdec.c
  • [DBH] libavformat/latmenc.c
  • [DBH] libavformat/lmlm4.c
  • [DBH] libavformat/lxfdec.c
  • [DBH] libavformat/matroskadec.c
  • [DBH] libavformat/matroskaenc.c
  • [DBH] libavformat/mm.c
  • [DBH] libavformat/mmf.c
  • [DBH] libavformat/mov.c
  • [DB

• ffmpeg - Stream multiple files over an ffserver to one ffplay at different times ? [closed]

  13 mai 2013, par golmschenk

  I have an ffserver up and running. Using this server I can run a simple ffplay command :

  ffplay udp://localhost:7777

  which then waits for a stream. Then if I stream something to the server with a simple ffmpeg command :

  ffmpeg -re -i small.mp4 -f mpegts udp://localhost:7777

  The video pops up and plays fine. However, after the video is finished and the ffplay is still waiting open with the display window showing the last frame of the video just sent, then if I try to run the same ffmpeg command again to play the video again, the ffplay gets a bunch of warnings which look similar to :

  [mpegts @ 0x7fde1c0008c0] Continuity check failed for pid 256 expected 2 got 0

  And there is no playback. I would like to be able to stream one video, leave the same ffplay open and a little while after the first video has stopped stream another video. Is there a way I can achieve this ? Thank you much !

• IE9+ not playing portait video in HTML5 video tag

  12 avril 2013, par ptrn

  For some reason I can't get IE9/10 to play video that is taller than wide, when using HTML5 video tags.

  Demo :
  http://s.l6.no/demo/video+html5/

  The demo shows one video scaled down from 1280x720, which plays perfectly fine in all tested browsers, and one video scaled down from 720x1280 which plays for all browsers but IE9/10.

  Tested and works for :

  • Chrome 26, Windows 7 64-bit
  • Chromium 24, Ubuntu 64-bit
  • Firefox 14, Windows 7 64-bit

  Tested and does not work for :

  • Internet Explorer 9, Windows 7 64-bit
  • Internet Explorer 10, Windows 7 64-bit

  I'm using FFmpeg to code the videos to MP4(x264) and WebM(VP8), with the current command dummed down to this :

  ffmpeg -i in.mp4 -vcodec libx264 -pix_fmt yuv420p -y -b:v 4000k out.mp4

  The lack of profile settings would be my first point, but since the other video is playing just fine, I can't see why it should matter.

  Any ideas ?

  Edit : soft rotating the video isn't really an option, as the user is to be able to download the video to play offline. I could transcode an extra version just for IE, but come on, there's gotta be another way, no ?