[mythtv] 20180705 Android Observations

[Aman Gupta]

On Thu, Jul 12, 2018 at 12:39 PM Peter Bennett <pb.mythtv at gmail.com> wrote:

>
>
> On 07/11/2018 03:16 PM, David Engel wrote:
>
> I tried using yesterday's patch to watch the World Cup last night and
> some other stuff.  I had to abandon that when playback got very
> stuttery and I didn't have time to debug.  I suspect your sledge
> hammer was getting used repeatedly.  I tried again later and it
> happened again and then went away.  It didn't happen on my other
> shield, but I didn't test with it much.
>
> Was this in normal playback, time stretch or fast forward? AFAIK the
> IllegalStateException that the sledge hammer handles only happens in fast
> forward or occasionally in skip/jump. (i.e. when flush is used).
>
> I suppose I need to dig into the FFmpeg source code and figure out the
> IllegalStateException and find the correct FFmpeg fix.
>
> According to mediacodec documentation, IllegalStateException only happens
> on dequeue output if the decoder is not executing or it is in asynchronous
> mode.
>
> It is not in asynchronous mode or dequeue output would never work.
>
> The ways it can stop executing are if you call "stop" or "reset" or
> "release" it. In ffmpeg there is a "stop" routine but it is never called,
> and there is no reset routine.  It seems that there is no way to get into a
> non-executing state. Prehaps it is in an error state. Unfortunately there
> is no native API that will tell you the state.
>
> It seems that this may be a bug in mediacodec on the shield. I don't know
> how much I should do to try and work around it. I have tried reordering
> calls and adding a stop and start after the flush, but nothing has helped.
>

FWIW I am not able to reproduce this issue with mpv-android. Are you maybe
calling ffmpeg APIs from different native threads?

Aman


> FYI, this might be related.https://forums.geforce.com/default/topic/1056259/shield-tv/shield-experience-upgrade-7-0/post/5834167/#5834167
> .  Kodi doesn't use ffmpeg (AFAIK) for MediaCodec.  I don't know about
> Plex.
>
>
> Perhaps I need to report this to NVidia
>
>
> Peter
>
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