[mythtv] Android OpenGL Performance

[David Engel]

On Mon, Dec 31, 2018 at 06:43:42PM -0500, Peter Bennett wrote:
> On 12/31/18 6:26 PM, David Engel wrote:
> > On Mon, Dec 31, 2018 at 05:05:33PM -0500, Peter Bennett wrote:
> > > In the latest master, Android OpenGL performance is now unacceptable.
> > > I notice the UYVY option has been removed from settings. Does this mean UYVY
> > > is now the default?
> > That settings has been gone for a more than a week.  I think the
> > default is now RGBA.
> > 
> > > In most cases OpenGL is not able to keep up with playback and frames are
> > > being dropped, where before it was keeping up successfully.
> > > 
> > > NVidia Shield
> > > With default setting (YV12 unchecked) - dropping frames on 1080i and 720p
> > > content
> > That's probably what I reported to Mark.  I don't remember seeing it
> > with 720p, though.  I'll try to retest it later.
> > 
> > >   - SD (480i) picture jumps up and down in a most disconcerting fashion (both
> > > Linear Blend and kernel deint)
> > I didn't try SD.
> > 
> > > With YV12 checked - 1080i is OK but dropping frames on 720p content
> > >   - SD (480i) picture is OK with linear blend
> > I didn't distinctly notice any dropping with 1080i but a/v sync seemed
> > to take longer than before after skipping.
> > 
> > > Amazon Fire 4K
> > > With default setting (YV12 unchecked) - dropping frames on 1080i and 720p
> > > content
> > >   - SD (480i) picture jumps up and down in a most disconcerting fashion
> > > With YV12 checked - dropping frames with 1080i, 720p is OK
> > >   - SD (480i) picture is OK
> > > Fire 4K still needs "extra stage" checked otherwise sometimes the screen is
> > > blank.
> > I haven't tried my Stick yet with the recent code yet.
> > 
> > David
> I changed the parameters in AndroidManifest.xml.in to -v playback. I think
> maybe we should use that as default so that users can easily see from the
> log if there are playback issues such as dropped frames. Some of the
> combinations were dropping fewer frames, so it was less noticeable visually.

I don't have a problem with making -v general,playback the default on
Android.  Though, if the user can is capable of running adb logcat, they
are proably capable of connecting to the control socket to change the
verbose setting too.

Here is my latest testing with with git version cc25495b on my Shield.

YV12 mpeg2 480i : No problems (including at 2x).

YV12 mpeg2 720p : No problems (including at 2x).

YV12 mpeg2 1080i : No problems (including at 2x).

no-YV12 mpeg2 480i : No problems (including at 2x).

no-YV12 mpeg2 720p : No problems (including at 2x).

no-YV12 mpeg2 1080i : Jittery at 1xx.  I uploaded a -v playback log at
https://pastebin.com/rD9Wvjv5 .

David
-- 
David Engel
david at istwok.net