PSA: libwebrtc now reports spec compliant and internally consistent video de-jitter buffer delays

[Rasmus Brandt]

We have recently landed changes (cl1, cl2) that update and improve the implementations of the following video webrtc-stats:

• jitterBufferDelay
• jitterBufferTargetDelay
• jitterBufferEmittedCount
• jitterBufferMinimumDelay

All of these should now be both spec compliant and internally consistent. The updated implementations are planned to ship with Chrome M115.

In particular, jitterBufferDelay has been changed to measure the actual time spent in the video de-jitter buffer, rather than the target time to spend in the video de-jitter buffer. If you have previously relied on the exact definition of the non-spec compliant version, you can estimate it like this: oldDefinitionJitterBufferDelay = jitterBufferMinimumDelay + totalDecodeTime + 10.

-- Rasmus