VLC 1.0.0/1.0.1 V4L2 + ALSA capture, xcode and stream prob.

[krakorar]

Hello,

I am surprised that I can no longer capture video from a v4l2 device and an alsa device simultaneously (video from webcam and audio from mic), transcode them and send them out via RTP with VLC 1.0.0->1.0.1. Instead of the v4l2-adev directive there is now a slave-input directive that does not appear to direct captured alsa input to the sout module like v4l2-adev did for previous versions of vlc. I can capture and transcode video and audio independently, but not together. Here is the command line that I am trying to invoke under vlc 1.0.1:

vlc -I dummy -V dummy --verbose=3 --dscp=0x01 v4l2:///dev/video1 :width=720 :height=480 :standard=0 :input-slave:alsa="hw:0,0" --sout '#transcode{vcodec=mp4v,vb=6000,fps=30,scale=1,acodec=mpga,ab=32,channels=2}:duplicate{dst=rtp{mux=ts,sdp=rtsp://192.168.1.178:16200/camera.sdp}' vlc://quit

...the result is a video only RTP encapsulated MPEG2 transport stream. What am I doing wrong??? Thanks in advance.

Rob Krakora

[Papageno]

Hi Krakorar,

I've a similar problem. I am using a webcam with mircophone and I can't stream the audio. What was your solution. Please can you post it.
My recorddevices:

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$ arecord -l ---]Karte 1: U0x46d0x9a1 [USB Device 0x46d:0x9a1], Gerät 0: USB Audio [USB Audio] Untergeordnete Geräte: 1/1 Untergeordnetes Gerät '0: subdevice #0 ...

My streaming-script:

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cvlc v4l2:///dev/video0:input-slave=alsa// :sout="#transcode{vcodec=mp2v,vb=800,scale=1,acodec=mpga,ab=128,channels=2,samplerate=44100}:duplicate{dst=std{access=udp,mux=ts{ttl=12},dst=239.155.1.1:1234},dst=display}"

Thanks.

[dj3c1t]

Hello,

Same problem here with VLC 1.0.2 on Ubuntu 9.10

this one plays line-in ok :

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vlc alsa://hw:0,0

this one plays webcam ok :

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vlc v4l2://

but this one only shows video without sound :

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vlc v4l2://:input-slave="alsa://hw:0,0"

did someone find a solution ?

[Rémi Denis-Courmont]

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vlc v4l2:// :input-slave="alsa://hw:0,0"

[Papageno]

Thanks a lot. The endless searching and trial/error is ended.

Here is my skript for a Video conversation directly to a specified computer (192.168.2.20). It needs only to play a network stream using rtp://:5004.

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cvlc v4l2:///dev/video1 :input-slave="alsa://hw:3,0" :sout="#transcode{vcodec=mp2v,vb=800,scale=1,acodec=mpga,ab=128,channels=2,samplerate=44100}:duplicate{dst=rtp{mux=ts{ttl=12},dst=192.168.1.20},dst=display}"

If you use this, don't forget to set v4l2:///dev/video1 and :input-slave="alsa://hw:3,0" to your device. And of course the IP of the receiver.

Live could be so easy (if you know the syntax for it )

Kind Regards
Hans