[Webkit-unassigned] [Bug 163433] playbackRate update while playing creates a small pause in the playback

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=163433

--- Comment #6 from Jer Noble <jer.noble at apple.com> ---
Created attachment 291663
  --> https://bugs.webkit.org/attachment.cgi?id=291663&action=review
AVPlayerSeekTest

Attaching the equivalent test using AVPlayer directly. Here's the log for running the video and audio tests:

Testing Audio.
Running (will take about 17 seconds)...
Speed 1.0: 0.949601, 1.1: 1.08663, 1.2: 1.18765
Diff 1.0: -0.252159, 1.1: -0.252159, 1.2: -0.252159
Wall clock: 1.0: 5.00329, 1.1: 5.17626, 1.2: 5.03575
Testing Video.
Running (will take about 17 seconds)...
Speed 1.0: 0.973931, 1.1: 1.09151, 1.2: 1.19286
Diff 1.0: -0.143297, 1.1: -0.143297, 1.2: -0.143297
Wall clock: 1.0: 5.49682, 1.1: 5.03157, 1.2: 5.53344

So the audio-only test case shows about a 250ms gap due to rate changes, and the audio+video test case shows a 143ms gap.

This should be filed as a Radar on http://bugreport.apple.com/ against AVFoundation.

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