[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
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Reporter: Mark.Buechler at gmail.com | Owner: ijr
Type: defect | Status: new
Priority: minor | Milestone: unknown
Component: mythtv | Version: head
Severity: medium | Resolution:
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Changes (by DannyCan at gmail.com):
* version: 0.20 => head
Comment:
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
simple.[[BR]]
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
repeats.[[BR]]
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
it.[[BR]]
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 =
1)!
}}}
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>
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