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<p>Thanks for the help and you're right about the 2 seconds.</p>
<p>I switched to Kurento media server (RTSP to WebRTC server) and i
can't get any closer than a 2s latency, but it's a lot better than
the 8s i had previously.<br>
</p>
<pre class="moz-signature" cols="72">Guillaume</pre>
<div class="moz-cite-prefix">Le 28/03/2017 à 17:20, Josh Gustafson a
écrit :<br>
</div>
<blockquote
cite="mid:CAOVFAB0mNoVkVMzOcP8PCVihuhLLhQX4mLXawiKW6RcGKZrKsw@mail.gmail.com"
type="cite">
<div dir="ltr">
<div class="gmail_extra">
<div class="gmail_quote">On Tue, Mar 28, 2017 at 2:29 AM,
Guillaume <span dir="ltr"><<a moz-do-not-send="true"
href="mailto:libav@shadowprojects.org" target="_blank">libav@shadowprojects.org</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin:0px 0px 0px
0.8ex;border-left:1px solid
rgb(204,204,204);padding-left:1ex">Hello,<br>
<br>
I have a dvr with security camera and one of them is
displayed (through a rspi 2) on a web page (rtsp stream)
with vlc plugin to show who is at the door and open it
remotely.<br>
Problem is, firefox 52 disabled npapi plugins (flash
player excepted) so it doesn't work anymore.<br>
<br>
I am trying to convert the stream in real time to one
compatible with html5 video tag, but at best, i have a 8
seconds delays. And it keeps filling the drive with
streaming files.<br>
But i don't see any bottleneck on the rspi, cpu, ram and
io seems fine.<br>
<br>
Here's the rtsp stream informations : Video: h264 (High),
yuv420p, 352x288, 1k tbr, 90k tbn<br>
<br>
I am running this command : avconv -v info -i "rtsp://<a
moz-do-not-send="true"
href="http://login@192.168.3.90:554/user=login&password=password&channel=1&stream=1.sdp"
rel="noreferrer" target="_blank">login@192.168.3.90:554<wbr>/user=login&password=password&<wbr>channel=1&stream=1.sdp</a>"
-c:v copy -bufsize 10240k -pix_fmt yuv420p
/var/www/portier.m3u8<br>
<br>
I can ran the conversion on a lxc container (with Ubuntu
16.04) which is more powerfull than a rspi 2, but even
there, i have a 4s delay (and still a growing number of
temporary files which fill the drive).<br>
<br>
Is there a way to do a better job and tell avconv to
remove its old files ?<br>
</blockquote>
<div><br>
</div>
<div>I've been working on something similar (though using
the APIs rather than the CLI.) There's a few things you
may find helpful in the options supported by the HLS
muxer: <a moz-do-not-send="true"
href="https://www.ffmpeg.org/ffmpeg-formats.html#hls-1">https://www.ffmpeg.org/ffmpeg-formats.html#hls-1</a></div>
<div><br>
</div>
<div>Under `hls_flags`, there's `delete_segments`, which
will cause the mux to automatically delete segments which
have "fallen off" the end of the playlist. So that part's
easy.</div>
<div><br>
</div>
<div>Latency is harder (or has been harder in my
experience.) One source of latency is the time it takes to
gather all the stream info from the source prior to the
start of muxing; I've found that with h264 from rtsp
cameras, this simply takes time and I haven't found a way
around it. A second source of latency is the HLS segment
size - HLS won't publish a segment until it's complete,
which means a latency at least as great as the (longest)
segment duration, which defaults to 2 seconds. You can try
adjusting that with `hls_time` and `hls_init_time`, but
when you're remuxing, the minimum segment duration is in
practice bound by the interval between keyframes, and with
the h264 streams I've seen from security cameras, that's
going to be around 2 seconds anyway. :-/</div>
<div><br>
</div>
<div>Josh</div>
<div><br>
</div>
</div>
</div>
</div>
<br>
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<br>
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</pre>
</blockquote>
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