Disable automatic frame rate conversion for MediaCodec on nVidia shields

Disable automatic frame rate conversion for MediaCodec on nVidia shields

MediaCodec on nVidia shield tablets has logic to change the frame
timestamps to convert the video frame rate to better map to the display
refresh rate. This breaks AVDA because it assumes the timestamps of the
frames submitted to MediaCodec are unaltered. The workaround, taken from
ExoPlayer, is to set "auto-frc": 0 in the MediaFormat.

BUG=637606

[watk, 2016-08-20 01:17:22]

watk@chromium.org changed reviewers:
+ dalecurtis@chromium.org

[watk, 2016-08-20 01:17:22]

Untested until we get the shield.

[DaleCurtis, 2016-08-21 22:49:53]

On 2016/08/20 at 01:17:22, watk wrote:
> Untested until we get the shield.

I think we always want to set this on Shield. My hunch is prior to M it didn't
rewrite timestamps and caused drift, now in M it is doing both and that fixes
Exoplayer and breaks us

[watk, 2016-08-22 17:19:40]

On 2016/08/21 22:49:53, DaleCurtis wrote:
> On 2016/08/20 at 01:17:22, watk wrote:
> > Untested until we get the shield.
> 
> I think we always want to set this on Shield. My hunch is prior to M it didn't
> rewrite timestamps and caused drift, now in M it is doing both and that fixes
> Exoplayer and breaks us

Ah, yeah, done. No reason to not always enable it.

[DaleCurtis, 2016-08-22 17:29:52]

lgtm assuming nvidia engineers can test this on a shield they have.

[watk, 2016-08-23 20:20:53]

Description was changed from

==========
Disable automatic frame rate conversion for MediaCodec on nVidia shields

MediaCodec on nVidia shield tablets has logic to change the frame
timestamps to convert the video frame rate to better map to the display
refresh rate. This breaks AVDA because it assumes the timestamps of the
frames submitted to MediaCodec are unaltered. The workaround, taken from
ExoPlayer, is to set "auto-frc": 0 in the MediaFormat.

BUG=637606
==========

to

==========
Disable automatic frame rate conversion for MediaCodec on nVidia shields

MediaCodec on nVidia shield tablets has logic to change the frame
timestamps to convert the video frame rate to better map to the display
refresh rate. This breaks AVDA because it assumes the timestamps of the
frames submitted to MediaCodec are unaltered. The workaround, taken from
ExoPlayer, is to set "auto-frc": 0 in the MediaFormat.

BUG=637606
==========

[watk, 2016-08-23 20:22:09]

Closing. This wasn't the actual issue. "Framerate filtering" is the thing
adjusting timestamps.