With alpha channel, we observe the artifacts on the receiver side, and
the reason is that when YUV channel has a key frame, it gives frame_buffer2
a chance to drop some previous frames. Then it is possible that some alpha
frames got dropped, which break the alpha frame dependence chain.
In this CL, we pack the YUV frame and alpha encoded frame together as one
entity to solve the issue.
Bug: webrtc:8773
Change-Id: Ibe746a46cb41fd92b399a7069e1d89f02f292af7
Reviewed-on: https://webrtc-review.googlesource.com/38481
Commit-Queue: Qiang Chen <qiangchen@chromium.org>
Reviewed-by: Emircan Uysaler <emircan@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#21737}
5670c86aec