[mythtv] AVSync2 Improvements

[John P Poet]

On Tue, Feb 12, 2019 at 10:31 AM David Engel <david at istwok.net> wrote:

> On Tue, Feb 12, 2019 at 11:01:19AM -0500, Peter Bennett wrote:
> > I have been using the latest patch
> https://code.mythtv.org/trac/attachment/ticket/13383/20190208_1644_catchup_plus.patch
> > for a couple of days and it looks good now.
> >
> > Mark- you said you may have some improvements - I plan to commit it
> anyway
> > and those can always be done afterwards.
> >
> > You said that making the wait into a series of short waits may improve
> > things. Currently on a desktop system everything is between -5 and +5 ms
> so
> > I don't know if much improvement is possible. Also on thinking about it I
> > don't know how that would help, if the operating system is going to delay
> > resuming a process on one wait, would it be less likely to delay it on a
> > bunch of smaller waits?
> >
> > If I don't hear anything back I will commit that patch to master and
> > fixes/30.
>
> Peter,
>
> Perhaps you must have missed my report on IRC.  The 0208 patch causes
> problems with live TV.  When starting live TV or changing channels,
> playback stutters badly until it is briefly paused or skipped back.  I
> don't know if earlier patches did this since I didn't test them on
> live TV.
>

I have not had a chance to try the last couple of patch candidates.  For
me, that Live TV issue is "long standing" and seems to depend on the source
material -- mpeg2 is fine, but H.264 with large key-frame distance has that
behavior.  In other words, the new avsync does not 'create' that problem,
at least for me.

John
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