[FFmpeg-trac] #3757(avcodec:new): -b_strategy 2 may cause severe artifacts

FFmpeg trac at avcodec.org
Sun Jul 6 11:51:59 CEST 2014

#3757: -b_strategy 2 may cause severe artifacts
             Reporter:  ejlasota  |                     Type:  defect
               Status:  new       |                 Priority:  normal
            Component:  avcodec   |                  Version:  git-master
             Keywords:            |               Blocked By:
             Blocking:            |  Reproduced by developer:  0
Analyzed by developer:  0         |
 Summary of the bug: Using -b_strategy 2 can cause severe artifacts on
 P-frames.  Higher -bf values increase the severity.

 How to reproduce:
 Execute the following on the attached file.

 % ffmpeg -i testinput_small.avi -vcodec mpeg1video -bf 16 -b_strategy 2
 -q:v 3 -an -y output.mpg

 ffmpeg version N-63833-gd4be318
 built on July 7, 2014
 (Zeranoe FFmpeg git-689e028 64-bit Static Windows build)

Ticket URL: <https://trac.ffmpeg.org/ticket/3757>
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