[mythtv-commits] Ticket #11852: IPTV recording with RTP protocol creates unusable videos

[MythTV]

#11852: IPTV recording with RTP protocol creates unusable videos
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 Reporter:  dvd-ram@…             |          Owner:  dekarl
     Type:  Bug Report - General  |         Status:  assigned
 Priority:  minor                 |      Milestone:
Component:  MythTV - Recording    |        Version:  0.27-fixes
 Severity:  medium                |     Resolution:
 Keywords:  IPTV RTP              |  Ticket locked:  0
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Comment (by dekarl):

 Replying to [comment:17 mbt2015@…]:
 > I started Wireshark and ran
 >   vlc rtp://@239.2.16.1:8208
 > for a few seconds.

 Thanks, that is exactly what I'm looking for.

 A1 TV appears to use encoders that implement RFC 5285 wrong. They use
 random bytes for padding when they must use 0 bytes for padding. Just open
 your trace in Wireshark and decode as RTP. Notice how most packets are
 malformed. This is due to the dissector trying to decode past the second
 header extension, when it actually is always just three random bytes of
 padding. (must be 0x00 0x00 0x00 instead)

 Find attached a candidate patch (compile tested) for review.

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Ticket URL: <https://code.mythtv.org/trac/ticket/11852#comment:24>
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