[mythtv-users] Two odd issues with NBC DTV recordings

[Tom Dexter]

On Thu, Oct 2, 2008 at 1:19 PM, David Engel <david at istwok.net> wrote:
> On Thu, Oct 02, 2008 at 12:12:27PM -0400, Doug Larrick wrote:
>> Tom Dexter wrote:
>> > 2008-10-01 03:11:24.902 [mpeg2video @ 0xb7306028]warning: first frame
>> > is no keyframe
>> >
>> > I believe they're from NBC recordings as well.
>>
>> The DVB recorder is not properly finding keyframes on some HD recordings:
>> http://svn.mythtv.org/trac/ticket/2849 , which was marked as a duplicate
>> of http://svn.mythtv.org/trac/ticket/799 .  The solution is to do a more
>> thorough parsing (partial decoding) of the video stream while it's being
>> recorded.
>
> I missed the first message in this thread so I would have responded
> earlier.
>
> I noticed this problem for a few weeks already and finally figured it
> out the other night.  The problem is NBC is encoding its video with
> keyframes further apart than the MythTV dtvrecorder expects.
> Consequently, the dtvrecorder thinks there aren't any keyframes and
> inserts seektable entries for non-keyframes.  I'm going to check in a
> change shortly which makes the dtvrecorder be a little more patient
> waiting for keyframes.
>
> While I'm at it, is anyone experiencing audio underruns with OTA Fox
> recordings?  That's another problem I'm still working on.
>
> David
> --
> David Engel
> david at istwok.net
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>
Thanks for the update.  I've been getting a few sparse audio underruns
in my frontend log but I can't tell for sure what recordings caused
them.  I'll try and keep an eye out for them.

Tom