[FFmpeg-trac] #6236(undetermined:new): FFmpeg bandwidth skyrockets upon scene change after the scene has been identical for 5 minutes.

FFmpeg trac at avcodec.org
Mon Mar 13 17:44:57 EET 2017


#6236: FFmpeg bandwidth skyrockets upon scene change after the scene has been
identical for 5 minutes.
-------------------------------------+-------------------------------------
             Reporter:  adamfenn28   |                     Type:  defect
               Status:  new          |                 Priority:  normal
            Component:               |                  Version:
  undetermined                       |  unspecified
             Keywords:               |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
 Summary of the bug:

 When RTMP streaming with FFmpeg, using either videotoolbox or x264, and
 streaming a static image for 5 or more minutes, before a scene change to a
 different image or motion video, FFmpeg will suddenly produce huge frames
 upon the scene change, resulting in 2-3x the configured bit rate, for 60
 seconds.   If the scene is left consistent for longer than 5 minutes, the
 impact will last for longer than 60 seconds.


 How to reproduce:

 Stream with FFmpeg using x264 or videotoolbox, and stream a static image
 for 5 minutes.  Observer the output bit rate and output frame size.  Then
 change the scene to a video.  The frame size and bit rate will skyrocket.
 Wait 60 seconds.  Continue to observe the bitrate and frame size.  They
 will be reduced.

 This is using ffmpeg version 3.2

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Ticket URL: <https://trac.ffmpeg.org/ticket/6236>
FFmpeg <https://ffmpeg.org>
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