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From: Tim Panton <tim@pi.pe>
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Date: Mon, 10 Jul 2023 11:54:38 +0100
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Subject: [Galene] Re: Heads up: default video codec is now VP9
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> On 10 Jul 2023, at 10:04, Juliusz Chroboczek <jch@irif.fr> wrote:
>=20
>> =46rom our experience the deal with autoplay on safari is that you =
can
>> only successfully call play from a click.
>=20
> Galene creates videos asynchronously, as people join and leave the =
group.
> We cannot require a click everytime somebody joins

You don=E2=80=99t need that - I think - if you have at least one <audio> =
or <video> tag playing already.
The problem crops up when that drops to zero.

> .
>=20
> There's an (undocumented?) hack in Safari, which allows autoplay if a =
page
> holds a reference to a microphone or webcam stream.  So what we do is =
that
> we keep a reference to a microphone stream throughout a session.  That
> seems to work on iPad, so I'm surprised it doesn't work on desktop.

I=E2=80=99m not surprised - the iOS implementation is much closer to the =
hardware,  it allocates actual hardware resources on demand.
whereas the Mac one seems to have a multiplexing layer over the hardware =
which isolates things somewhat.

>=20
> (Thankfully, we don't need to do that on other browsers, since users =
like
> the ability to follow a lecture on Galene without being required to =
grant
> microphone access.  Thanks to Safari's "security" features, =
videoconferencing
> software can spy on you.)

I think you can achieve the same thing by playing silent audio or =
=E2=80=98hold music' into a media tag. (Keeping the playing tags > zero)=20=

What you are seeing is that creating an echo cancelling mic session also =
allocates a playable output channel and so satisfies the criteria.

You still need a user click on chrome to activate play - but only for =
the first few sessions - which is a nightmare to test.

T.

>=20
> -- Juliusz
>=20