[FFmpeg-trac] #4168(undetermined:new): defect : mpeg2 interlaced yuv420 chroma incorrectly decoded

FFmpeg trac at avcodec.org
Fri Dec 12 00:08:43 CET 2014

#4168: defect : mpeg2 interlaced yuv420 chroma incorrectly decoded
             Reporter:  clam         |                    Owner:
                 Type:  defect       |                   Status:  new
             Priority:  normal       |                Component:
              Version:  git-master   |  undetermined
             Keywords:               |               Resolution:
             Blocking:               |               Blocked By:
Analyzed by developer:  0            |  Reproduced by developer:  0

Comment (by cehoyos):

 Replying to [comment:19 clam]:
 > MPEG2 is mostly used for interlaced videos

 This is simply not true here: Except for news and sports, everything I
 watch is progressive (but is flagged as interlaced).

 > The decoders must know they work on interlaced pictures since it changes
 the way macroblocks are encoded in the stream.

 That is why this flag is always set to interlaced for (many or most) dvb
 streams and at least for some progressive DVDs. As a result, the flag
 cannot be used to tell the scaler if the content is interlaced or not.

Ticket URL: <https://trac.ffmpeg.org/ticket/4168#comment:21>
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