On Dec 20, 2020, at 11:40 AM, Micael Silva <[email protected]> wrote:
> 
> I’m not so sure, but I think that no sound MP4 can autoplay. I’ve seen 
> situations like these before.

Yeah, a quick, non-exhaustive test on MacOS 10.15.7 gave the following

Safari: Autoplay works, whether sound set to 0 or not
Chrome & Firefox: Autoplay will play when volume is set to 0.  Otherwise it 
will not.

Setting the "volume to 0" is not the same as setting the attribute 'muted' to 
'true'.
in other words <video autoplay="true" muted="true"></video> is not sufficient 
to trigger autoplay.

This is beyond FFmpeg issues, but it's interesting.

Thanks again for your insights.
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