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

[John Pilkington]

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 for everything and ignore the second entry. Delete the 
>>> "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

John P