[FFmpeg-trac] #1601(avcodec:open): msmpeg4 reencode MB as intra or picture with higher quantizer if syntax limits are hit (was: msmpeg4v2 enc: blinking square at the bottom-right corner of the video)

[FFmpeg]

#1601: msmpeg4 reencode MB as intra or picture with higher quantizer if syntax
limits are hit
-------------------------------------+-------------------------------------
             Reporter:  ami_stuff    |                    Owner:
                 Type:  enhancement  |                   Status:  open
             Priority:  normal       |                Component:  avcodec
              Version:  git-master   |               Resolution:
             Keywords:  msmpeg4      |               Blocked By:
  qscale                             |  Reproduced by developer:  1
             Blocking:               |
Analyzed by developer:  1            |
-------------------------------------+-------------------------------------
Changes (by michael):

 * status:  new => open
 * reproduced:  0 => 1
 * component:  undetermined => avcodec
 * keywords:   => msmpeg4 qscale
 * version:  unspecified => git-master
 * analyzed:  0 => 1
 * type:  defect => enhancement


Comment:

 This is a sideeffect of the motion estimation, bitrate and limitations of
 msmpeg4.
 You can workaround the issue by using -mbd 2.

 Its a bit borderline but i think this is a feature request not so much a
 bug. The bug is in the way msmpeg4v2 was designed. MS made a mistake there
 in the range that is needed to store coefficients.

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Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/1601#comment:1>
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