[mythtv-users] Varying data formats during digital reception

Jose Paulo Moitinho de Almeida moitinho at civil.ist.utl.pt
Mon Nov 5 17:46:40 UTC 2012


On Monday 05 November 2012, Mike Perkins wrote:
> On 05/11/12 16:00, John Pilkington wrote:
> > On 05/11/12 14:37, Jose Paulo Moitinho de Almeida wrote:
> >> On Saturday 03 November 2012, Mike Perkins wrote:
> >> ....
> >> 
> >>> The question is: What changes are being made to mythtv to cope with the
> >>> fact that the bitrate, framerate, resolution, etc of any recorded file
> >>> may change from instant to instant?
> >> 
> >> Last Saturday I updated to 0.26 (mythbuntu system with an old nvidia
> >> card ==> nouveau, opengl, no vdpau) and since then I have been "trying
> >> to understand" why the frontend sometimes hangs. The files are ok for
> >> vlc, but mplayer does not like them.
> >> 
> >> The problem happen when some new programs start and I was ready to blame
> >> the broadcaster, but reading this information I realised that the
> >> problem seems to happen exactly when the program changes from wide to
> >> 4:3, something that happened in 0.25 without problem.
> >> 
> >> Is there a possible relation? I can try to cut a sample with the
> >> problematic passage.
> > 
> > I would think it's very likely.  The various players probably look at
> > different places in the recording to identify the streams that are
> > present.
> > 
> > If you can create a series of cutpoints using the MythTV editor you may
> > be able to get a usable version using this.  It needs only a seektable
> > based on valid keyframes.  I haven't had occasion to use it recently and
> > it used mythconfig.txt, which is no more.
> > 
> > http://www.mythtv.org/wiki/Mythpycutter
> 
> ...problem is, he has to get the program started before he can use the
> editor to set the cutpoints...
> 
> possible if you have sufficient padding before the actual content starts, I
> suppose. But will the editor fail be
> cause the format changed, even so?

I am not at home but, effectively, using the editor is not possible. Editing 
those files past that point also hangs the frontend. 

But I can work with "tail/head -c" by iteration/bisection of the file, until I 
just capture the zone of the relevant point. 

I'll post that tonight.

Regards

ZP



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