[mythtv-users] DVB subtitles and delay

Kenni Lund kenni at kelu.dk
Thu Apr 15 10:32:28 UTC 2010

2010/4/14 Mark Kendall <mark.kendall at gmail.com>:
> On 13 April 2010 03:54, Martin <martin.rene.mortensen at gmail.com> wrote:
>> MythTV has since the 0.22 ffmpeg sync not had great support for DVB
>> subtitles. They are delayed - and this off course has very low WAF.
>> Theres a bug report on it, fix is seemingly a somewhat large rewrite and has
>> been postponed to 0.24 now.
>> TRAC ticket 6753: http://svn.mythtv.org/trac/ticket/6753
> The problem lies somewhere between the broadcaster and ffmpeg's
> demuxing of the stream, with the net result that some subtitles arrive
> very late. I worked with the patch that Janneg posted to the ticket
> for queueing transmitted packets and that did generate some
> improvements but it certainly did not fix it and was far from a
> complete/commitable solution. There are various issues - though
> ideally this would be fixed within ffmpeg itself. Overall there is no
> simple fix that I can see that sits within the main MythTV code.

Mark, I just did a quick test with FFMPEG SVN r22837 and when playing
the clip in ticket #6753 with ffplay, the subtitles are close to, if
not perfectly, in sync :) So it seems like this have been fixed in
upstream FFMPEG...

Best Regards

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