Rasmus Brandt 9673ca42ea Add field trial for bitrate limit interpolation for simulcast resolutions <180p.
Prior to this fix, bitrate limit interpolation would be effectively
disabled for resolutions <180p, since the interpolation anchors
in the table were identical for 320x180 and 0x0.

By reducing the target and max bitrates for 0x0 to 0 kbps,
respectively, this fix will enable interpolation. The min bitrate
is unchanged, in order to not reduce the min bitrate and thus
risk poor interactions with the BWE in the low bitrate regime.

The purpose of this field trial is to evaluate the video quality
in a large scale test. If that falls out well, we will flip the
trial to be a kill switch instead.

Bug: webrtc:12415
Change-Id: Ib4ed74c611bf289712be8990ca059b9f4556c448
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/202026
Commit-Queue: Rasmus Brandt <brandtr@webrtc.org>
Reviewed-by: Ilya Nikolaevskiy <ilnik@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#33102}
2021-01-29 14:23:17 +00:00
..