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• avcodec_decode_video2 always sets got_picture_ptr to 0 while using with live555

  10 octobre 2013, par Richard Macwan

  I am trying to decode frames using libavcodec. My applications retrieves rtp packets from on rtsp stream using live555. I have searched quite a lot for reasons of avcodec_decode_video setting got_picture_ptr to 0 but haven't been able to find it.
  Can anyone tell me how avcodec_decode_video2 works internally ? What reasons might lead the got_picture_ptr pointer to be set to zero ?
  PS : The function does read bytes i.e the return value is always a positive number, not -1.
  I'm stumped here, any help would be appreciated. I haven't quoted any code since the code to decode using avcodec_decode_video2 is fairly generic and there is nothing special in my code.(I have decoded rtsp streams earlier using libavcodec, just not along with live555)

• How do i use libavfilter to deinterlace frames in my video player software

  19 juin 2014, par justanothercoder

  I’m using libavformat/libavcodec/libswscale/libavutil/libavfilter (ffmpeg related libraries) to make a video player.

  I’v gotten into issues with interlaced videos, it just pairs them incorrectly... It always draws the previous bottom frame with the current top frame. Which results in things I don’t want. And i’v tried messing about with the variables around this, it just won’t work. (I haven’t found a player which would play the videos I have correctly, no you can’t have them, i’m sorry)

  I managed to find a way around this, by re-encoding the video with the following command :

  ffmpeg -i video.mp4 -filter:v yadif -vcodec mpeg4 out.avi

  Now what i’d need is directions on how to do this with c++ code, inside my video player.

  I haven’t found any tutorials on the matter and the ffmpeg.c source code is just too alien to me.

  A link to a tutorial would be fine, i just haven’t found it..

  Edit :

  Also this example was worth checking out :

  https://github.com/krieger-od/imgs2video/blob/master/imgs2video.c

  It’s by a gentleman named Andrey Utkin

• javacv FFmpegFrameGrabber.start() blocked,not run next line

  23 août 2017, par L.U

  when i run grabber.start it blocked,not run next line.

  FFmpegFrameGrabber grabber = new  FFmpegFrameGrabber("rtsp://admin:123456@192.168.3.2:10554/tcp/av0_0");
  
  grabber.start();
  
  final AtomicBoolean interruptFlag = new AtomicBoolean(false);

  get console message :

  • [rtsp @ 00000000004ec600] CSeq 6 expected, 0
    received.
  • [rtsp @ 00000000004ec600] CSeq 6 expected, 0
    received.
  • [rtsp @ 00000000004ec600] CSeq 6 expected, 0
    received.
  • [rtsp @ 00000000004ec600] CSeq 6 expected, 0
    received.

  how to resole it ?thanks