I forgot to mention that these issues don't occur with the unified pipeline disabled.

It turns out the freezing occurs when:
* MediaCodec is waiting for an output buffer to be returned to it, and
* the video is offscreen, so the rendering pipeline is holding onto an unrendered frame, and
* when you scroll the video back on screen, if more than 2 seconds have elapsed, the AVDA timer will have stopped. So when the output buffer is released, the timer is still off so playback freezes.

does keeping the timer on all the time fix it?  when i saw a very similar problem, it didn't.

how many unrendered buffers is MediaCodec willing to provide in this case?  i saw that it was willing to provide many, and they were returned to AVDA without rendering.  are you seeing frames come back in ReusePictureBuffer when it's off-screen?

if MC is only providing one buffer, then it makes sense.  making the codec image start the timer is easy enough.

Matt, can you take it or assign appropriately?

Dale, were you still looking into fixing this?