[mythtv-commits] Ticket #2498: DVB: 720p mpeg2 doesn't play correctly

MythTV mythtv at cvs.mythtv.org
Wed Jan 17 00:11:46 UTC 2007

#2498: DVB: 720p mpeg2 doesn't play correctly
 Reporter:  Mark.Buechler at gmail.com  |        Owner:  ijr    
     Type:  defect                   |       Status:  new    
 Priority:  minor                    |    Milestone:  unknown
Component:  mythtv                   |      Version:  head   
 Severity:  medium                   |   Resolution:         
Changes (by DannyCan at gmail.com):

  * version:  0.20 => head


 I believe this is a problem with support for frame repeats which is
 discussed here http://forum.doom9.org/showthread.php?t=119242&page=2[[BR]]

 Here is a quote from the forum:
 harissa is right. I think it is something else, something real
 I believe that the RFF flags are being used for frame repeats rather than
 field repeats.[[BR]]
 That makes perfectly good sense given that the output is supposed to be
 progressive: 720P.[[BR]]
 That causes a big problem for DGMPGDec, because it supports only field
 I'll have to add support for frame repeats.

 I will verify my theory in the debugger today but it's the only plausible
 theory that fits the known facts.[[BR]]
 My successful encode working with that theory also tends to corroborate
 But I want to see the MPEG syntax in the debugger.

 As to why there are patches of frame repeats mixed with non-repeated
 sections, I do not know, but at least I know how to fix the D2V process
 for streams like these.

 EDIT: Theory confirmed in the debugger (RFF plus progressive_sequence =
 I think it's some sort of new thing broadcasters are using for some reason
 so support seems to be limited at this point.[[BR]]
 However, after reading the topic I have been able to use VirtualDub-MPEG2
 to convert those recordings to Xvid without any sync issues.

Ticket URL: <http://svn.mythtv.org/trac/ticket/2498#comment:2>
MythTV <http://www.mythtv.org/>

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