Moritz Barsnick barsnick at gmx.net
Mon Dec 14 23:15:35 CET 2015

On Mon, Dec 14, 2015 at 18:56:18 +0000, Nick LaCommare wrote:

> Looking for a way to capture a windows PC's default recording device
> and transcode it to MP3 audio and stream via UDP to a Barix box that
> only accepts MPEG1/MP3 audio.
> ffmpeg -f dshow -i audio="Transmit (Plantronics C435-M)" -acodec libmp3lame -f mp2 udp://
> ffmpeg -f dshow -i audio="Transmit (Plantronics C435-M)"  -f mp3 udp://

a) "-acodec libmp3lame -f mp2"
   I think MP3 audio in an MP2 container (which is a "raw" MP2 audio
   container) shouldn't work, even though ffmpeg happily muxes it.
b) "-f mp3"
   You are streaming raw MP3. This may or may not be fine for your
   Barix box. According to Barix documentation[1], this should work.
   Said documentation seems to show how to configure CBR 192 kbit/s,
   but says the device can handle "all frequencies/bitrates".
   Perhaps you should just try "-c:a libmp3lame -b:a 192k -f mp3 [...]".
   You could also try RTP.

> This electronic message transmission, and all attachments, contains
> information from Extron Electronics which is confidential and
> privileged.

Is it? Then why do you spread it all around the internet?


[1] http://www.barix.com/fileadmin/data/howto/How_to_use_the_VLC_Media_Player_v15.pdf

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