[mythtv] FFmpeg sync

[Janne Grunau]

On Tuesday 14 October 2008 03:30:31 David Engel wrote:
> This time with attachments.
>
> On Mon, Oct 13, 2008 at 11:17:44PM +0200, Janne Grunau wrote:
> > On Saturday 11 October 2008 21:30:46 David Engel wrote:
> > > When I played an HDPVR 480p H.264 recording using mythfrontend,
> > > the video played fine but I got no audio and the following log
> > > messages:
> > >
> > > 2008-10-11 13:43:40.745 Opening audio device 'default'. ch 1(1)
> > > sr 12000 2008-10-11 13:43:40.745 Opening ALSA audio device
> > > 'default'. 2008-10-11 13:43:40.763 AudioOutput Error: Unable to
> > > get period size for playback: Invalid argument 2008-10-11
> > > 13:43:40.763 AudioOutput Error: Unable to set ALSA parameters
> > > 2008-10-11 13:43:40.763 NVP: Disabling Audio, reason is: Unable
> > > to set ALSA parameters
> >
> > Is that a recording with AAC audio? please send a complete log, the
> > error looks unrelated to the ffmpeg merge.
>
> None of these problem occur without the ffmpeg patch.  This is with
> svn r18673, BTW.
>
> It looks like AAC.  It's whatever the HD-PVR generates by default
> from the analog inputs.
>
> See attached hdpvr.log.
>
> Also see attached hdpvr2.log.  It's from a different recording and
> results in an infinite loop.

Strange, it looks like the aac parser is still broken.
>
> > > This was with mythtv configured with "--enable-debug".  When I
> > > rebuilt later with "--compile-type=debug", audio worked.
> >
> > could you try with with --compile-type=profile? --enable-debug
> > shouldn't be used.
>
> What's wrong with just --enable-debug by itself?  What's the
> recommended way to get debug symbols without losing optimzation?  If
> that's suppoed to be compile-type=profile then it's very mislabeled.

it is, and it's not that mislabeled. you need debugging symbols for 
profiling and you want you're profile matching the release build a 
close as possible. --enable-debug is only inherited from ffmpeg's 
configure

> > > When I played a QAM 720p MPEG2 recording using mythtv, it
> > > segfaulted with with "--enable-debug" and "--compile-type=debug".
> > >  The backtrace from the "--compile-type=debug" version is
> > > attached.
> >
> > The backtrace is useless, it looks if it is for two separate
> > processes and it misses symbols for libmythavcodec. And please
> > don't cut the message in which thread and function the segfault
> > occured. If the error with that recording is reproduceable a sample
> > would help.
>
> See attached mpeg2hd.log and mpeg2hd.gdb.
>
> It happens with the kdfw2.mpg file I gave you for the other problem.
> I'll send you the URL privately in case you don't still have it.

I still have it and it never caused problems for me. it looks like an 
error in the ac3 parser/decoder.

Is this a 32bit system?

Janne