[mythtv] AVSync Problem on entering recorded playback

[Graham Finlayson]

Stephen,

I also have encountered this problem in the past and it was annoying me. I
made the following quick hack based on what you have discovered, and this
works on my environment. In the for loop in AvFormatDecoder::ScanStreams  I
added

if ( enc->enc_type == CODEC_TYPE_VIDEO && enc->bit_rate == 0 )
    continue;

I also have DVB-T in the UK.

Graham

On 3/29/06, Stephen Williams <stephen.gw at gmail.com > wrote:
>
> On 3/28/06, Stephen Williams < stephen.gw at gmail.com> wrote:
> > Okay, i've been making some progress on this now. Disabling the
> > dropping of frames / doubling of frame times and allowing the AVSync
> > code to settle down (takes a few minutes to stabilise) it has become
> > apparent that on initial entry to recorded playback it is trying the
> > play the video at 30fps (note that this is PAL content at 25fps).
> >
> > After pausing / unpausing it then starts to play the content correctly
> at 25fps.
> >
> > Now for the million dollar question, why are we initially defaulting to
> 30fps?
> >
> > Stephen
>
> OK, I have a 'fix' but may be treating the symptom and not the cause.
>
> It appears that the AVD (avformatdecoder) it detecting _two_ video
> streams in each of my mpg files (note, these are all DVB-T in the UK).
> One of the video streams looks legit whilst the other apparently has a
> bit-rate of 0 and seems to just pick up some default params from AVD
> (e.g. 30fps, 640x480).
>
> NVP::SetVideoParams was being called for both video streams and was
> clearly just getting confused.
>
> For the time being I have added a check in AVD::ScanStreams that
> discards any video streams with a bit-rate of 0, as I said previously,
> this 'fixes' my problem.
>
> Is there any other tool I can use to look at the mpeg file and double
> check the existence of this second video stream? My hunch is that the
> stream doesn't really exist and there may be a problem with
> AVD::ScanStreams.
>
> Any advice greatly appreciated.
> Stephen
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