How to reproduce:
1. Open the attached project
2. Open and play Far Plane scene. Video will start playing
3. Press "PlaybackSpeed" button in the scene and slide up to increase the value (~3)
4. Press ">|" Nex video button
5. VP8 video starts playing

Actual result: AudioSampleProvider buffer overflow. ... sample frames discarded warning is spawned
Expected result: There is no such warning spawned

Note: if you continue with the same playback speed to the next H264 video, warning stop

Reproducible: 2019.4.21f1, 2020.1.17f1, 2021.1.1f1.2209.3, 2021.2.0a10.1508

Tested and reproduced on:
OSX Unity Editor
VLNQA00152, HUAWEI P9, 7.0.0, HiSilicon Kirin 955, Mali-T880
VLN0150, iPad Pro 10.5", iOS 12.3.1, A10X, Metal