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On Feb 10, 2013, at 8:16 AM, Robin Gareus  wrote:
> On 02/10/2013 08:38 AM, Jeremy Hansen wrote:

quoted text
>>

>> I'm looking for a simple tool where I can point it at an http audio

>> stream, define a number of seconds to detect silence and exit with a

>> non-zero status if silence is detected.  It seems like this should be

>> easy but I've been search high and low for such a utility and nothing

>> simple exists.  Unfortunately I'm not much of a developer, but this

>> doesn't seem like it would be that difficult.  Maybe it's harder than

>> I think, hence no tool that I can find.

>

> https://github.com/x42/silan may do the job. It prints ranges or silence

> in a file or stream (incl. mp3,aac,wma,ogg,m4a,.. decoding and http,

> rtmp stream support thanks to libav/ffmpeg). It is used by airtime

> (sourcefabric's radio) to highlight silent ranges.

>

> silan -t 0.1 -s -60d "http://mp2.somafm.com:9016" \

> |  grep -quiet "Sound Off" \

> && echo " do something"

This is strange.  This works, but I'm unable to grep the output and I'm not sure why.  If I pipe to grep, I get nothing.  I tried redirecting stderr to stdout and doesn't seem to work.
[jeremy@serv src]$ ./silan -t 2.0 -s -40d "http://live.skidrowstudios.com:8000/live"

Info: signal threshold: 0.010000 ^= -40.000dBFS

0.069569 Sound On

15.814150 Sound Off
Doing the same test:
[jeremy@serv src]$ ./silan -t 2.0 -s -40d "http://live.skidrowstudios.com:8000/live" | grep "Sound Off"

Info: signal threshold: 0.010000 ^= -40.000dBFS
I get nothing.
Thanks

-jeremy

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