[mythtv-users] Problem with 1080i h264 video - video appears to be twice as long as it should.

John P Poet jppoet at gmail.com
Tue Jun 2 17:29:02 UTC 2009

On Tue, Jun 2, 2009 at 10:02 AM, Manuel McLure<manuel at mclure.org> wrote:
> On Tue, Jun 2, 2009 at 12:06 AM, belcampo <belcampo at zonnet.nl> wrote:
>> Manuel McLure wrote:
>>> My TV provider (which uses IPTV) recently switched from MPEG2 to h264
>>> streams, and since then I'm seeing a problem with new recordings. When
>>> they're playing, Mythtv shows the length as being twice what it really
>>> is - i.e. a recording from 5:00 to 6:00 shows as 1:59 in length. Also,
>>> fast forwarding and rewinding as well as commercial skip don't work
>>> correctly - sometimes a "skip forward" command will actually skip back
>>> in the show.
>> That's because it's interlaced material and ffmpeg libs until recently
>> wasn't able to distinguish between field and frames. So that's why it
>> doubles and seeking is a problem.
> I'm building against ffmpeg 0.5 - what version do I need for this to
> work correctly? Also, interlaced 1080i MPEG2 streams work fine - is
> the ffmpeg limitation only applicable to h264 streams?

Recording with Myth, right?  The problem as actually with Myth's basic
parsing of the H.264 stream during recording.  This has been fixed in
trunk, but is unlikely to be backported to the fixes branch.

At least this is true for HD-PVR and DVB recordings.  I am not sure
how IPTV works.

A: Because it messes up the order in which people normally read text.
Q: Why is top-posting such a bad thing?

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