tree 79cfe87cd672d1b2ed680a276c43bef2dcdf9954
parent 8f0b876fc10fecd817aa1f6a69646d9ce049e26a
author Linus Nilsson <lnilsson@google.com> 1596049013 -0700
committer Linus Nilsson <lnilsson@google.com> 1596138856 -0700

Transcoder: Improve video transcoding with audio passthrough performance

MediaSampleWriter was stalling the video transcoding when processing
chunks of audio samples at a time. Since the underlying muxer
buffers ~1 sec worth of data and interleaves tracks anyway the
sample writer now prioritizes pulling samples from the track that is
farthest behind while making sure the tracks are kept reasonably
in sync, i.e. max ~1 second divergence.

This change also raises the priority of the video transcoding thread
since that will be the bottleneck when audio is pased through.

Test: Unit tests
Fixes: 160268606
Change-Id: I004583b2a31a57882ea543072be321f9f1347508