On 2020-09-13 11:21, Graham Perrin wrote:

1. Chromium simply does not play AV content e.g. <https://www.ted.com/talks/james_geary_metaphorically_speaking> – after a click to play, there's a moment of visual motion but no playback

2. if Firefox media.cubeb.backend set to oss then behaviour is the same as Chromium

3. if Firefox media.cubeb.backend is not set (audio backend defaults to pulse-rust) then playback occurs through IDT 92HD81B1X (Analog) – not USB.

Try to configure a smaller audio buffer size in virtual_oss . Sometimes devices request a very small audio buffer .

--HPS
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