[mythtv-users] Varying data formats during digital reception

[Jose Paulo Moitinho de Almeida]

On Tuesday 06 November 2012, Mark Greenwood wrote:
> On Tuesday 06 Nov 2012 08:09:25 Gary Buhrmaster wrote:
> > On Tue, Nov 6, 2012 at 6:29 AM, Mark Greenwood <fatgerman at gmail.com>
> > wrote: ...
> > 
> > > I have 0.26 (on mythbuntu 12.04) and VDPAU. I tried a few things.
> > > 
> > > Plays fine in mythtv (as a Movie, not sure if that matters)
> > > Plays fine in mplayer when mplayer is set to use vdpau output
> > > Set mplayer to use xv output and the video stops at the change of
> > > aspect but the audio carries on. The mplayer output gives you the
> > > problem:
> > > 
> > > [h264 @ 0x7faa4c59e280]Width/height changing with threads is not
> > > implemented. Update your Libav version to the newest one from Git. If
> > > the problem still occurs, it means that your file has a feature which
> > > has not been implemented. [h264 @ 0x7faa4c59e280]decode_slice_header
> > > error
> > > [h264 @ 0x7faa4c59e280]no frame!
> > 
> > Note that this has been reported against FFmpeg/Libav recently, so it
> > is possible that a fix may eventually make it into the codes(*).  When
> > it does, and the next FFmpeg merge happens, you should get a fix.
> > Until then, you are probably out of luck if using the software
> > decoder.  I suppose you could try running without multiple threads
> > to see if it works.
> 
> I did try setting the number of threads (using the smplayer GUI) to 1 but
> it made no difference. I have always had my doubts as to whether that
> option actually does anything.
> 
> Mark
> 
> > Gary
> > 
> > (*) I expect that some rework of the codes is needed to synchronize
> > the change(s) across the threads working on the stream.  If it would
> > have been easy, I would expect it would already be in there.

Multi threading seems to be the problem for rendering
"ffplay -threads 1 12002_20121104214000.mpg" works, as well as 
"mplayer -lavdopts threads=1 12002_20121104214000.mpg" (though with the sound 
advanced..)

but neither "ffplay -threads 2 12002_20121104214000.mpg" nor
"mplayer -lavdopts threads=2 12002_20121104214000.mpg" manage to pass the 
aspect ratio transition.

I expect that when at home I change my playback profile to be single threaded 
the problems will disappear (under the carpet!). Should be OK as I only play 
SD content.

If I understand correctly the question initially raised, regarding the effect 
of these changes in Lossless-Cut and (eventually) in some HDHomerun recordings 
is unrelated.

Regards

ZP