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• FFMPEG : Sync problem between audio and video on Live Stream

  20 mai 2022, par zeitnot

  I am using NGINX RTMP as an RTMP server and FFMPEG as a client for live stream. When I connect to the RTMP server with the following command, I get an output file that contains slow motion for almost 5 seconds. But the sound is OK.

  


  ffmpeg -re -i rtmp://somertmp -c copy -f flv rtmp://a.rtmp.youtube.com/live2/sometoken -f flv output.mp4


  


  As the preceding example shows, I deliver the stream to youtube and at the same time, I get a copy. Youtube does not show slow motions but when I open the file with ffplay I can see the problematic frames.

  


  I want to fix these slow motions and make it synced with audio with ffmpeg or if not possible I want to tell ffmpeg to cut those slow frames along with audio channel so video and audio would be synced.

  


  For days, I am trying to find a solution for this problem but unfortunately, I could not. Any help will be appreciated.

  


• Extract frames from video with ffmpeg - header problem ?

  19 juillet 2019, par Jehol

  I want to convert .AVI files coming from a camera-trap to individuals frames, ideally using ffmpeg. Up to now I am not succeeding.

  The most simple thing I tried, to try to locate the problem, is this (I want all frames and my test file is test.avi) :

  ffmpeg -i test.avi output_%04d.png

  It fails with the following console message :

  [avi @ 0x559fb596f8c0] unknown stream type 73647578
  
  [avi @ 0x559fb596f8c0] Something went wrong during header parsing, tag [0][0]id has size 338702712, I will ignore it and try to continue anyway.
  
  [mjpeg @ 0x559fb59709e0] No JPEG data found in image
  
      Last message repeated 100 times
  
  [avi @ 0x559fb596f8c0] decoding for stream 0 failed
  
  [avi @ 0x559fb596f8c0] Could not find codec parameters for stream 0 (Video: mjpeg (MJPG / 0x47504A4D), none(bt470bg/unknown/unknown), 1280x720): unspecified pixel format
  
  Consider increasing the value for the 'analyzeduration' and 'probesize' options
  
  [avi @ 0x559fb596f8c0] Could not find codec parameters for stream 1 (Video: none (JUNK / 0x4B4E554A), none, 11025x22050): unknown codec
  
  Consider increasing the value for the 'analyzeduration' and 'probesize' options
  
  Input #0, avi, from 'test.avi':
  
    Duration: 00:00:10.50, start: 0.000000, bitrate: 28129 kb/s
  
      Stream #0:0: Video: mjpeg (MJPG / 0x47504A4D), none(bt470bg/unknown/unknown), 1280x720, 20.01 fps, 20.01 tbr, 20.01 tbn, 20.01 tbc
  
      Stream #0:1: Video: none (JUNK / 0x4B4E554A), none, 11025x22050, 11025 tbr, 11025 tbn, 11025 tbc
  
  Stream mapping:
  
    Stream #0:1 -> #0:0 (? (?) -> png (native))
  
  Decoder (codec none) not found for input stream #0:1

  The actual video duration is 10s (when read using vlc for instance, and this is indeed the length of video programmed on the camera-trap. ffmpeg says the duration is 10.50s, and says there is a problem with header parsing (see above).

  I have no idea how to sort this, despite having looked at more than many ffmpeg ’convert video to frames’ post. Any hint would be appreciated, thanks.

• Revision 03a60b78db : Add a new control of golden frame boost in CBR mode 0 means that golden boost i

  27 octobre 2014, par Yaowu Xu

  Changed Paths :
   Modify /vp9/encoder/vp9_encoder.h

  
   Modify /vp9/vp9_cx_iface.c

  
   Modify /vpx/vp8cx.h

  
   Modify /vpxenc.c

  
  
  Add a new control of golden frame boost in CBR mode

  0 means that golden boost is off, and uses average frame target rate,
  a non-zero number means the percentage of boost over average frame
  bitrate is given initially to golden frames in CBR mode.

  Change-Id : If4334fe2cc424b65ae0cce27f71b5561bf1e577d