[Icecast] Keeping icecast + ices 2.X running on a strict schedule?
Jordan Verner
jv_erner at hotmail.com
Sun May 25 14:03:10 UTC 2014
Hello,
Regarding accounting for track lengths, could sox (soxi) be getting it wrong?
Here's my approach atm:
$lengths = array();
foreach($files as $val)
{
//Note that $files has already been populated by glob()
$temp = explode(":", shell_exec('soxi -d "'.$val.'"'));
$length = $temp[0] * 60 * 60;//convert the hours to seconds.
$length += ($temp[1] * 60);//convert minutes to seconds
$length += $temp[2];//add the seconds
$length *= 1000;//convert to milliseconds.
$lengths[$val] = $length;
}
With that done, I can retrieve lengths like this:
$test = $lengths["/home/caturria/songs/etc.ogg"];
I'm going to try subtracting a tenth of a second or so from these values just to see if I can get slightly more sane results.
Thanks,
Jordan.
Date: Sun, 25 May 2014 13:23:09 +0000
From: thomas at ruecker.fi
To: icecast at xiph.org
Subject: Re: [Icecast] Keeping icecast + ices 2.X running on a strict schedule?
On 05/25/2014 01:13 PM, Jordan Verner
wrote:
Icecast and Ices are running on the same machine
and it is a dedicated server.
It is a Xeon 1270 V2 CPU with 16 GB ram running Centos 64-bit.
Any thoughts on which settings I could try next? I have tried
everything that appears to relate to the speed at which the
stream occurs to no avail.
One point I forgot to mention is that some tracks bring on more
deviation than others. Shorter tracks, like spots, through it
off more than longer tracks (I think). There are definitely
tracks that inflict this effect more than others.
I'm going to revise my guess. It's probably inaccuracies in how you
account for track length in your system. But ultimately it's
irrelevant.
I'd suggest to explore the idea of a filler jingle, as pointed out
earlier. If you want to get fancy, you can even have several to
dynamically chose to adjust for the offset more accurately.
Although, I'm going to say that this is overkill and a 10s
jingle/sound file should be just fine, also most listener software
will have a buffer of 10-60s anyway, so being "on the dot" doesn't
really come out right anyway. If you want silence, then please note
that you should use very low level noise instead of digital silence.
For the listener it will be indistinguishable, as the noise will
probably be below the noise floor of their sound card, but for the
vorbis encoder this makes a crucial difference. Digital silence
compresses down to single bits per second and will lead to source
timeouts and ill effects in listener software and should be avoided
at all cost when streaming.
I haven't experienced any other timing oddities on
the machine.
If you can live with the above, then I'd suggest to take that route.
Cheers
TBR
> Date: Sun, 25 May 2014 07:05:42 +0000
> From: thomas at ruecker.fi
> To: icecast at xiph.org
> Subject: Re: [Icecast] Keeping icecast + ices 2.X running
on a strict schedule?
>
> Hi,
>
> On 05/24/2014 11:29 PM, Jordan Verner wrote:
> > I'm using Icecast, Ices, and the script module
configuration to serve
> > the playlist to the server. Playlists are scheduled
once per day with
> > regularely placed events (like spots) which run at
specific times.
> > Unfortunately it's being served too fast, so it's
always getting ahead
> > of schedule (gaining about 10 seconds on every
hour).
>
> Sounds like the clocking is faster for some reason.
>
> > I have tried adjusting the flush-samples setting in
ices.xml and the
> > queue size in the icecast.xml file to no avail.
> > I've had to resort to implementing a forced delay
into the php script
> > which feeds the filenames to ices, so that if ices
calls it
> > significantly early it'll wait to issue the next
filename until it's
> > closer to it's scheduled start time. This was
causing disconnects
> > whenever it became deviated beyond 10 seconds.
Disabling source
> > timeout fixed this, but still it tries to get as far
ahead as
> > physically possible and takes as much wiggle room as
I give it plus more.
>
> That won't fix it. You're inserting gaps into the stream
and that's a
> bad thing for your listeners too.
>
> > Is there any fix for this? Streaming for 24 hours
would have it
> > calling the script as much as 4 minutes ahead of
schedule, forcing my
> > script to hang for all that time before issuing each
and every filename.
> > This is way too much deviation for streams which
stick to a schedule.
> > Two weeks of streaming would have everything an hour
early.
>
> So for some reason on your system Ices is running 0.28%
faster. I'm not
> sure what causes this and where those samples go. Is it
by chance a
> virtual machine?
>
> You can try to fiddle further with ices settings. If that
doesn't fix it
> then you could always have your script insert a 10s
filler jingle if it
> detects that you're out of the timeframe.
>
> Other options would be to explore different automation
solutions, but
> they might suffer the same problem if it's some
underlying clock oddity
> on your system.
>
> Cheers
>
> Thomas
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