[mythtv] dvb zero length record

John Pullan john.pullan at gmail.com
Mon Jun 6 13:11:12 UTC 2005

On 06/06/05, Daniel Kristjansson <danielk at cat.nyu.edu> wrote:
> On Mon, 2005-06-06 at 20:56 +1000, Phil Vid wrote:
> > This has been resolved by turning off the 'Wait for SEQ Start Header'
> > flag in the DVB card setup. Thanks Will Uther for suggesting this fix.
> > Unfortunately I don't have any experience with MPEG video stream
> > decoding, so is anyone able to explain why this is necessary and what
> > the purpose of the sequence frame wait is?
> We try to wait for the sequence start header as a proxy for waiting for
> the first I frame. The reason we want to wait for the first I frame is
> two fold: first ffmpeg used to crash the program when you didn't, second
> if you don't wait for the first I frame then you can get weird visual
> effects as partial P and B frames arrive before the first full frame.

So assuming that this is Phil's issue, does this imply that the
detection code is broken in some way. If so how can we debug it to get
to the bottom of the problem ?


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