[App_rpt-users] Streaming questions
kt9ac at ameritech.net
Fri Sep 23 11:57:53 EDT 2011
Thanks Steve, I'll play with these settings. I initially tried 3K as a cutoff but still hear the "artifacts" noise that comes with Allison announcing things (that's how I test quietly). It reminds me of how P25 sounds on the fringe, so its likely something in the conversion to MP3 from RAW or GSM.
I guess for streaming, we don't need a range like what a radio would provide (say 300-3000hz), but perhaps something narrower.
To answer Bote as well, I'm using these standard settings for Lame, and most changes from say 8K to 22.05K make it sound like Chipmunks got into the system. I'm still learning the settings.
I still need to figure out how to get the stream to work at the base URL, not requiring a filename.
--- On Fri, 9/23/11, Steve Passmore <k6kya at hokeynet.net> wrote:
From: Steve Passmore <k6kya at hokeynet.net>
Subject: Re: [App_rpt-users] Streaming questions
To: app_rpt-users at ohnosec.org
Date: Friday, September 23, 2011, 12:03 AM
Got my Highs and Lows swapped... oops
On 9/22/2011 22:00, Steve Passmore wrote:
I don't believe wav is a stream-able protocol. The metallic sound
is more an artifact of compression than the protocol used. You
might try bumping up the bitrate and/or adding a lowpass filter to
strip off the highest frequencies, this is commonly done with
stream encoders. I've added a highpass filter to remove
PL. I imagine you could do low pass the same way.
Here's what I use.
outstreamcmd=/bin/sh,-c,/usr/bin/lame --preset cbr 24 --highpass
0.2 -r -m m -s 8 --bitwidth 16 - - | /usr/bin/ezstream -c
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