[mythtv] Android playback synchronization (was Re: mythfrontend-20210221-arm-v32-Pre-2365-gb6e2003f64)

[David Hampton]

On Wed, 2021-02-24 at 21:22 +0000, John Pilkington wrote:
> On 23/02/2021 18:12, Peter Bennett wrote:
> > 
> > On 2/23/21 11:23 AM, Peter Bennett wrote:
> > > 
> > > On 2/23/21 9:34 AM, Peter Bennett wrote:
> > > > 
> > > > On 2/23/21 8:43 AM, John wrote:
> > > > > Playback is very jerky with  the latest android build but
> > > > > fine with 
> > > > > the same release on Intel hardware.
> > > > > 
> > > > > Tested on F4K & Shield TV.
> > > > > 
> > > > > I cannot say whether the issue is UK specific, tested with 
> > > > > 1920*1080 at 25fps.
> > > > > 
> > > > > H264 vaapi is good.
> > > > > 
> > > > > Mediacodec and opengl on android poor.
> > > > > 
> > > > > Apologies as I can't compile for android I cannot bisect the
> > > > > issue.
> > > > > 
> > > > > FWIW mythfrontend-20201222-arm-v32-Pre-1870-g283caa7b84 is
> > > > > fine.
> > > > > 
> > > > > 
> > > > > 
> > > > Have you tried the various options in the playback profile? I
> > > > believe 
> > > > the default playback profile for Mediacodec may have two
> > > > entries, the 
> > > > first one being for "Standard" decoding. If you have that it
> > > > will use 
> > > > "Standard" Entry if you have one and look at the Mediacodec
> > > > entry. 
> > > > There are options for Mediacodec and Mediacodec(decode only).
> > > > Try 
> > > > various options here to see if the problem is resolved.
> > > > 
> > > > You may have already done this. I will try it out later myself
> > > > to see 
> > > > if I have the same issues and respond.
> > > > 
> > > > At this point I am not working on the mythfrontend playback,
> > > > Mark 
> > > > Kendall is doing all of the work. I am just doing the packages.
> > > > If 
> > > > the problem persists, please create a ticket in github and Mark
> > > > can 
> > > > take a look at it.
> > > > 
> > > > Peter
> > > > 
> > > I tried it and I agree that playback is awful. There seems to be
> > > no 
> > > synchronization of audio and video. The video shoots ahead at
> > > high 
> > > speed and then slows to a crawl, then repeats that again.
> > > 
> > > Possibly caused by chrono changes or playback changes.
> > > 
> > > Peter
> > > 
> > > 
> > > 
> > Just checked and it is only the 32bit build of Android mythfrontend
> > that 
> > has the problem. On the shield you can run the 64bit version and
> > that 
> > works fine. The fire stick will not support 64 bit and needs the
> > 32bit 
> > build.
> > 
> > Peter
> 
> I have several times watched good continuous playback of mpeg2 video
> for 
> 30 minutes or so - and then quite suddenly erratic speed changes and 
> loss of sync start and look likely to the end.  On the recording I
> have 
> playing now it's OK for 36 minutes.  Firestick 4K, Peter's build at 
> 2365, 32 bit, MPEG-2 ffmpeg, Deint 4xCPU 2x CPU Onefield

I just committed a change that should fix the playback problem on 32-
bit android. Please try again after Peter updates his builds.

David