[FFmpeg-trac] #4000(undetermined:closed): mpeg4: Magenta color shift in first GOP

[FFmpeg]

#4000: mpeg4: Magenta color shift in first GOP
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             Reporter:               |                    Owner:
  ErikCJohansson                     |                   Status:  closed
                 Type:  defect       |                Component:
             Priority:  normal       |  undetermined
              Version:  unspecified  |               Resolution:  invalid
             Keywords:               |               Blocked By:
             Blocking:               |  Reproduced by developer:  1
Analyzed by developer:  0            |
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Changes (by michael):

 * status:  new => closed
 * resolution:   => invalid
 * reproduced:  0 => 1


Comment:

 MPEG* is lossy compression, the magenta is the result of that in this
 case.
 you can use a higher bitrate like with  -b 10M -rc_init_cplx 1000 or force
 a lower quantizer to avoid this. There are also probably a few other
 options. It affects just the first frames because the rate control code
 lacks information at the begin and thus makes different decissions

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Ticket URL: <https://trac.ffmpeg.org/ticket/4000#comment:8>
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