[mythtv] [mythtv-users] HDPVR & 1080i streams

Mark Buechler mark.buechler at gmail.com
Tue May 26 23:50:03 UTC 2009


Hi

On Thu, May 21, 2009 at 9:58 AM, Mark Buechler <mark.buechler at gmail.com>wrote:

> Hi
>
> On Thu, May 21, 2009 at 7:10 AM, ryan patterson <ryan.goat at gmail.com>wrote:
>
>> On Wed, May 20, 2009 at 8:10 PM, Mark Buechler <mark.buechler at gmail.com>
>> wrote:
>> > I love the look of HDPVR recordings/LiveTV at 1080i, but I can't stand
>> the
>> > ping-pong effect the frontend has when RingBuffer files switch or the
>> HDPVR
>> > stops and restarts encoding. I'm sure many people have seen these in
>> their
>> > logs:
>> >
>>
>> I've had a HD-PVR working at 1080i for half a year and I've never seen
>> this problem.  Could you describe it?
>>
>> --
>>
>
> The video ping-pongs around the audio. The log messages I included show
> video behind audio, frame interval being halved, video catching up and
> surpassing the audio which results in frames being dropped so the audio can
> catch up and the whole process starts over.
>
> - Mark.
>

I apologize for moving this discussion to mythtv-dev, but nobody on -users
can help.

I think this may be ab easy fix, but I'm not seeing it:

2009-05-26 19:37:03.786 NVP: Video is 5.90302 frames ahead of audio,
                        doubling video frame interval to slow down.
2009-05-26 19:37:03.852 NVP: Video is 4.88431 frames ahead of audio,
                        doubling video frame interval to slow down.
2009-05-26 19:37:03.919 NVP: Video is 3.85803 frames ahead of audio,
                        doubling video frame interval to slow down.
2009-05-26 19:37:04.840 NVP: Video is 30 frames behind audio (too slow),
dropping frame to catch up.
2009-05-26 19:37:04.844 NVP: Video is 30 frames behind audio (too slow),
dropping frame to catch up.
2009-05-26 19:37:04.848 NVP: Video is 30 frames behind audio (too slow),
dropping frame to catch up.
2009-05-26 19:37:04.852 NVP: Video is 30 frames behind audio (too slow),
dropping frame to catch up.

The frontend correctly doubles the frame interval until video is within a
handful of frames from audio. Then we see a 30 frame jump in the other
direction almost one second later. From there on, it's a constant ping pong.

- Mark.
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