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• mpeg-ts h264/aac into mp4 container change unplayable on Quicktime playable on VLC [closed]

  16 avril 2013, par arbief

  I'm trying to change the container of a video streamed with HLS into an mp4 file. The capture and conversion is being done with ffmpeg libavformat, the output video is playable in VLC but not on quicktime the quicktime decoder crashes when trying to decode it.

  I'm not experienced with h264 NAL/PPS/SPS to identify if something is not liked by quicktime there. And I dont know how to get at least an error message from quicktime to maybe have a clue of where the problem lies.

  I havent changed anything from the h264 packets obtained by ffmpeg. I just pass them along to the ffmpeg muxer (I just modify the timestamps for it to play in sync with the video)

  What makes this video unplayable on quicktime but playable on VLC ?

  Example MP4

• FFDEC_H264 dropping non-key frames

  15 avril 2013, par Kranti

  I am working on a sample GStreamer application to play MPEG2TS Video.

  My pipeline is :

  appsrc ! h264parse ! ffdec_h264 ! ffmpegcolorspace ! ximagesink

  If I pump the data without setting any timestamp, all the frames are getting played

  videoBuffer = gst_app_buffer_new (rawVideo, bufSize, test_free_video, rawVideo);

  But if I set the timestamp to the buffer, only I-frames are getting played :

  videoBuffer = gst_app_buffer_new (rawVideo, bufSize, test_free_video, rawVideo);
  
  GST_BUFFER_TIMESTAMP(videoBuffer)  = calc_timestamp(rawVideo);

  calc_timestamp() is a function to calculate timestamp based on PES header info

  From the GST_LOGS :

  Dropping non-keyframe (seek/init)
  
  Dropping non-keyframe (seek/init)
  
  Dropping non-keyframe (seek/init)

  The above logs are getting repeated. I don't have any clue, why is this happening ? Any input would be appreciated.

  Thanks in advance,
  Kranti

• ffmpeg not using wildcard properly from batch script

  20 mars 2013, par Paul Green

  What I want to do is actually super simple and is working just fine if executed from within the cmd window, though it does not work when used within a batch script. The following command would normally get all .png files with the pattern anim_xxxx.png (%04d stands for 4 numbers in ffmpeg).

  ffmpeg -f image2 -i anim_%04d.png -vcodec mjpeg -q:v 0 -r 25 foo.avi

  Now the error I get is with the wildcard for my image sequence and I have no clue what the problem is. Using another wildcard like * gives me the same error.

  [image2 @ 000000000033e8c0] Could find no file with with path
  'anim_render.bat4d.png' and index in the range 0-4
  anim_render.bat4d.png : No such file or directory

  does %04d resemble any variable in a batch file that does not exist outside of batch files ? I could not find any similar cases so far.