I’ve had a few queries regarding streaming audio as well as video on the Raspberry Pi, so tonight I set up my little Raspberry Pi with a Logitech C110. This webcam also has a microphone integrated which the Pi can use to record audio.
Everything has been setup as per part 3 of my ffmpeg streaming guide.

A little investigation reveals which hardware device the microphone is recognised as.
`

arecord -l

List of CAPTURE Hardware Devices
card 1: C110 [Webcam C110], device 0: USB Audio [USB Audio]
Subdevices: 1/1
Subdevice #0: subdevice #0
`
So the device is recognised as card 1. This comes in later when we are setting up the audio part of the streaming.

I’ve updated the webcam.sh script to reflect the fact that we are now recording sound –
ffserver -f /root/ff.conf & ffmpeg -vcodec mjpeg -v verbose -r 15 -s 176x128 -f video4linux2 -i /dev/video0 -f alsa -ac 1 -i hw:1 http://localhost:81/webcam.ffm

And I also need to update ff.conf with the new streaming settings
The Stream webcam section has now turned into this –
<Stream webcam.avi> Feed webcam.ffm Format avi VideoSize 176x128 VideoFrameRate 15 VideoBufferSize 40 VideoBitRate 64 AudioBitRate 32 AudioChannels 1 AudioSampleRate 11025 VideoQMin 1 VideoQMax 20

With this configuration, I could start ffmpeg with audio and video streaming. However I could not get my laptop with vlc to connect to it for now, so I’ll have to keep investigating that.
Hopefully this helps though.

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