[FFmpeg-trac] #11172(undetermined:open): M2TS: parser assumes until PES or in PES at least one packet has no 0x47 byte in TP_extra_header

[FFmpeg]

#11172: M2TS: parser assumes until PES or in PES at least one packet has no 0x47
byte in TP_extra_header
-------------------------------------+-------------------------------------
             Reporter:  Balling      |                    Owner:  llyyr
                 Type:  defect       |                   Status:  open
             Priority:  normal       |                Component:
                                     |  undetermined
              Version:  git-master   |               Resolution:
             Keywords:  m2ts         |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
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Comment (by llyyr):

 > Can you apply your patch?

 I'm not sure what you want from me. I've posted the patch. It just needs
 to be reviewed/pushed.

 > just check the fifth byte is 0x47 and then check that 4 previous bytes
 are not 0x47

 You're misunderstanding the problem. Your bug occurs when the 5th byte is
 where the TS packet starts, and it's prefixed by 4 bytes of
 TP_extra_header and those 4 bytes happen to include the sync byte.
 Skipping the first four bytes for 192 bytes packets is the fix, no need to
 backtrack or anything like that.
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Ticket URL: <https://trac.ffmpeg.org/ticket/11172#comment:3>
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