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From: Juliusz Chroboczek <jch@irif.fr>
To: err404@free.fr
Cc: galene@lists.galene.org
Subject: [Galene] Re: poor screen sharing quality on galene (vp9) when the cpu is not strong enough.
Date: Wed, 29 Dec 2021 19:18:56 +0100	[thread overview]
Message-ID: <87ee5vl1f3.wl-jch@irif.fr> (raw)
In-Reply-To: <250d8537-8742-1e65-ce54-66ffead13256@free.fr>

> the video stream quality was good but when I tried to share my screen,
> the screen sharing quality was uggly, really...  even on a not moving
> screen (displaying static text).

[...]

> I tried the same on another computer (better cpu, better graphic card),
> the quality was better on screen sharing

> it is appear that every second (or two), the quality drop again to
> ugly. (seem the stream was lost and restarted)

Interesting.  The periodic drop in quality indicates that somebody is
requesting a new keyframe every two seconds.  This may happen if either
the browser or the server believes that the stream is broken.  I'll see if
I can reproduce the issue.

Was that over WiFi?  Did the statistics interface indicate large numbers
of lost packets?  What happens when you disable simulcast on the sender
side?  What happens if you set the sender's video quality to "low"?  What
happens if you set the sender's video quality to "unlimited"?

> I though that sharing a static screen was easier than streaming a 720p
> webcam :p

The reolution of the webcam is chosen by the browser, it's most probably
lower than 720p (probably 640x400).  You may manually toggle the
resolution by doing

  /set resolution [1024,768]

then restarting the video stream.  (This is deliberately undocumented,
until I find a good UI.  Unfortunately, the JavaScript API does not allow
me to find out the webcams native resolution, so it's tricky.)

-- Juliusz

      reply	other threads:[~2021-12-29 18:18 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-12-29 12:09 [Galene] " err404
2021-12-29 18:18 ` Juliusz Chroboczek [this message]

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