The VideoLAN Forums

Posted: **02 Apr 2016 05:53**

I'm trying to setup a Raspberry pi as a baby monitor. I have video working, but can't manage to figure out how to mux in audio from my USB microphone.

Specs:
Raspberry Pi B+
Raspberry Pi Camera Module
USB Microphone

Code: Select all

# Video Working
raspivid -h 972 -w 1296 -fps 12 -br 46 -o - -t 0 | cvlc -v stream:///dev/stdin --sout '#rtp{sdp=rtsp://:8554/}' :demux=h264

I've tried several variations but can't seem to get a working stream.

Code: Select all

# alsa  input-slave
raspivid -h 972 -w 1296 -fps 12 -br 46 -o - -t 0 | cvlc -v stream:///dev/stdin --sout '#rtp{sdp=rtsp://:8554/}' :demux=h264 :mux=ts --input-slave=alsa://plughw:1,0

# Output -- results in a bunch of scrolling output like this
#...
[00d32858] core input error: demux doesn't like DEMUX_GET_TIME
[00d32858] core input error: demux doesn't like DEMUX_GET_TIME
[00d32858] core input error: demux doesn't like DEMUX_GET_TIME
[00d32858] core input warning: clock gap, unexpected stream discontinuity
[00d32858] core input warning: feeding synchro with a new reference point trying to recover from clock gap
[00d32858] core input error: demux doesn't like DEMUX_GET_TIME
[00d32858] core input warning: clock gap, unexpected stream discontinuity
[00d32858] core input warning: feeding synchro with a new reference point trying to recover from clock gap
[00d32858] core input error: demux doesn't like DEMUX_GET_TIME
[00d32858] core input error: demux doesn't like DEMUX_GET_TIME
[00d32858] core input error: demux doesn't like DEMUX_GET_TIME
[00d32858] core input error: demux doesn't like DEMUX_GET_TIME
[00d32858] core input error: demux doesn't like DEMUX_GET_TIME
[00d32858] core input error: demux doesn't like DEMUX_GET_TIME
[00d32858] core input error: demux doesn't like DEMUX_GET_TIME
[00d32858] core input error: demux doesn't like DEMUX_GET_TIME
[00d32858] core input error: demux doesn't like DEMUX_GET_TIME
[00d32858] core input error: demux doesn't like DEMUX_GET_TIME
[00d32858] core input error: demux doesn't like DEMUX_GET_TIME
[00d32858] core input warning: clock gap, unexpected stream discontinuity
[00d32858] core input warning: feeding synchro with a new reference point trying to recover from clock gap
[00d32858] core input error: demux doesn't like DEMUX_GET_TIME
[00d32858] core input warning: clock gap, unexpected stream discontinuity
[00d32858] core input warning: feeding synchro with a new reference point trying to recover from clock gap
[00d32858] ^Cmmal: Aborting program

[00d32858] core input warning: clock gap, unexpected stream discontinuity
[00d32858] core input warning: feeding synchro with a new reference point trying to recover from clock gap
[00d32858] core input error: demux doesn't like DEMUX_GET_TIME
[b441a4c8] core decoder error: cannot continue streaming due to errors

and

Code: Select all

# the microphone device as input slave
raspivid -h 972 -w 1296 -fps 12 -br 46 -o - -t 0 | cvlc -v stream:///dev/stdin --sout '#rtp{sdp=rtsp://:8554/}' :demux=h264 --input-slave=/dev/snd/by-id/usb-C-Media_Electronics_Inc._USB_PnP_Sound_Device-00


#Output

VLC media player 2.2.0-rc2 Weatherwax (revision 2.2.0-rc1-118-g22fda39)
[009c7370] core interface error: no suitable interface module
[008566e0] core libvlc error: interface "globalhotkeys,none" initialization failed
[009c7210] dbus interface error: Failed to connect to the D-Bus session daemon: Unable to autolaunch a dbus-daemon without a $DISPLAY for X11
[009c7210] core interface error: no suitable interface module
[008566e0] core libvlc error: interface "dbus,none" initialization failed
[009c7210] dummy interface: using the dummy interface module...
[b440bb50] core access error: read error: File descriptor in bad state
[b440bb50] filesystem access error: read error: File descriptor in bad state
[b440bd18] core stream error: cannot pre fill buffer
[008699a0] core input warning: cannot create a stream_t from access
[008699a0] core input error: Invalid PCR value in ES_OUT_SET_(GROUP_)PCR !
[008699a0] core input error: ES_OUT_SET_(GROUP_)PCR  is called too late (pts_delay increased to 300 ms)
[008699a0] core input error: ES_OUT_RESET_PCR called

What am I missing?

Thanks for your help!

Erik

Posted: **15 Jul 2016 19:04**

Having the same issue here.

You got some results?

My last try was:
raspivid -o - -t 0 -n -w 640 -h 360 -fps 40 | cvlc -v --sout-transcode-vfilter adjust --brightness 1.4 stream:///dev/stdin :v4l2-standard=ALL :input-slave=alsa://hw:1,0 :live-caching=3000 --sout '#transcode{}:http{dst=:8556/kizi.mpg}' :demux=h264

But keep getting "core input error: demux doesn't like DEMUX_GET_TIME"

Posted: **15 Jul 2016 21:57**

I haven't had any luck. Would love a nudge in the right direction by someone who really knows VLC inside and out....

Posted: **15 Jul 2016 23:34**

Input video format does not convey timestamps compatible with ALSA. Muxing is impossible.

Posted: **01 Sep 2016 19:22**

I'm having the same issue - is there anyway to make the timestamps compatible - or to use something besides Alsa with a USB mic that would allow this to work?

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