[vlc] capture from microphone

Mon Oct 15 15:06:29 CEST 2007

2007/10/15, Gun Akkor <gakkor at patton.com>:
>
> All,
>
> I am trying to capture/stream video from a Video4Linux compatible
> capture card, and audio from an on-board microphone input using a x86
> based Intel motherboard, linux OS (kernel 2.6.23-rc), and VLC version
> 0.8.6c
>
> Here is the command line I use for capturing video:
>
> vlc -vvv v4l:// :v4l-vdev="/dev/video0" :v4l-norm=1 :v4l-width=320
> :v4l-height=240 :v4l-fps=15 :v4l-audio=2 --sout
> '#duplicate{dst="transcode{vcodec=mp4v, vb=1024, sfilter=time,
> soverlay}:std{access=udp, mux=ts, dst=192.168.200.10:1235}"}'
>
> This works perfectly, and video is received at the destination.
>
> For audio,
>
> vlc -vvv v4l:// :v4l-adev="/dev/audio" :v4l-audio=2 --sout
> '#duplicate{dst="transcode{acodec=mp4a, ab=192}:std{access=udp, mux=ts,
> dst=192.168.200.10:1235}"}'
>
> This works just fine, too. Audio is received at the destination.
>
> However, when I try to do both simultaneously, I only receive audio, but
> no video, i.e.
>
> vlc -vvv v4l:// :v4l-adev="/dev/audio" :v4l-vdev="/dev/video0"
> :v4l-norm=1 :v4l-width=320 :v4l-height=240 :v4l-fps=15 :v4l-audio=2
> --sout '#duplicate{dst="transcode{vcodec=mp4v, vb=1024, acodec=mpga,
> ab=192, sfilter=time, soverlay, channels=2, audio-sync}:std{access=udp,
> mux=ts, dst=192.168.200.10:1235}"}'
>
> Could somebody help me with this? I must be missing something,
>
> Thanks in advance !
>
> GA
>
> Here is the debug output for the audio/video combo case:
>
> *****
> [00000001] main private debug: checking builtin modules
> [00000001] main private debug: checking plugin modules
> [00000001] main private debug: loading plugins cache file
> /root/.vlc/cache/plugins-04041e.dat
> [00000001] main private debug: recursively browsing `modules'
> [00000001] main private debug: recursively browsing `/usr/lib/vlc'
> [00000001] main private debug: recursively browsing `plugins'
> [00000001] main private debug: module bank initialized, found 178 modules
> [00000001] main private debug: opening config file /root/.vlc/vlcrc
> [00000001] main private warning: config file /root/.vlc/vlcrc does not
> exist yet
> [00000001] main private debug: CPU has capabilities 486 586 MMX MMXEXT
> SSE SSE2 FPU
> [00000001] main private debug: looking for memcpy module: 3 candidates
> [00000001] main private debug: using memcpy module "memcpymmxext"
> [00000226] main playlist debug: waiting for thread completion
> [00000226] main playlist debug: thread 16386 (playlist) created at
> priority 0 (playlist/playlist.c:184)
> [00000227] main private debug: waiting for thread completion
> [00000227] main private debug: thread 32771 (preparser) created at
> priority 0 (playlist/playlist.c:210)
> [00000228] main interface debug: looking for interface module: 1 candidate
> [00000228] main interface debug: using interface module "hotkeys"
> [00000228] main interface debug: thread 49156 (interface) created at
> priority 0 (interface/interface.c:231)
> [00000230] main interface debug: looking for interface module: 1 candidate
> [00000230] main interface debug: using interface module "screensaver"
> [00000230] main interface debug: thread 65541 (interface) created at
> priority 0 (interface/interface.c:231)
> [00000226] main playlist debug: adding playlist item `v4l://' ( v4l:// )
> [00000232] main interface debug: looking for interface module: 1 candidate
> Remote control interface initialized. Type `help' for help.
> [00000232] main interface debug: using interface module "rc"
> [00000232] main interface debug: thread 81926 (manager) created at
> priority 0 (interface/interface.c:216)
> [00000226] main playlist debug: creating new input thread
> [00000234] main input debug: waiting for thread completion
> [00000234] main input debug: thread 98311 (input) created at priority 0
> (input/input.c:265)
> [00000234] main input debug: creating statistics handler
> [00000236] main stream output debug: stream=`duplicate'
> [00000237] main private debug: looking for sout stream module: 1 candidate
> [00000237] stream_out_duplicate private debug: creating 'duplicate'
> [00000237] stream_out_duplicate private debug:  * adding
> `transcode{vcodec=mp4v, vb=1024, acodec=mpga, ab=192, sfilter=time,
> soverlay, channels=2, audio-sync}:std{access=udp, mux=ts,
> dst=192.168.200.10:1235}'
> [00000236] main stream output debug: stream=`transcode'
> [00000239] main private debug: looking for sout stream module: 1 candidate
> [00000236] main stream output debug: stream=`std'
> [00000242] main private debug: looking for sout stream module: 1 candidate
> [00000242] main private debug: set sout option: sout-standard-access to
> udp
> [00000242] main private debug: set sout option: sout-standard-mux to ts
> [00000242] main private debug: set sout option: sout-standard-dst to
> 192.168.200.10:1235
> [00000242] stream_out_standard private debug: creating
> `udp/ts://192.168.200.10:1235'
> [00000242] stream_out_standard private debug: extension is 10:1235
> [00000242] stream_out_standard private debug: extension -> mux=(null)
> [00000242] stream_out_standard private debug: using
> `udp/ts://192.168.200.10:1235'
> [00000244] main private debug: looking for sout access module: 1 candidate
> [00000244] main private debug: net: connecting to 192.168.200.10 port 1235
> [00000244] main private debug: localized Domain Names not supported -
> disabled
> [00000246] main private debug: thread 114696 (sout write thread) created
> at priority 0 (udp.c:268)
> [00000244] access_output_udp private debug: udp access output
> opened(192.168.200.10:1235)
> [00000244] main private debug: using sout access module
> "access_output_udp"
> [00000242] stream_out_standard private debug: access opened
> [00000247] main private debug: looking for sout mux module: 1 candidate
> [00000247] mux_ts private debug: shaping=200000 pcr=70000 dts_delay=400000
> [00000247] main private debug: using sout mux module "mux_ts"
> [00000236] main stream output debug: muxer support adding stream at any
> time
> [00000242] stream_out_standard private debug: mux opened
> [00000242] main private debug: using sout stream module
> "stream_out_standard"
> [00000239] main private debug: set sout option: sout-transcode-vcodec to
> mp4v
> [00000239] main private debug: set sout option: sout-transcode-vb to 1024
> [00000239] main private debug: set sout option: sout-transcode-acodec to
> mpga
> [00000239] main private debug: set sout option: sout-transcode-ab to 192
> [00000239] main private debug: set sout option: sout-transcode-sfilter
> to time
> [00000239] main private debug: set sout option: sout-transcode-soverlay
> to (null)
> [00000239] main private debug: set sout option: sout-transcode-channels to
> 2
> [00000239] main private debug: set sout option:
> sout-transcode-audio-sync to (null)
> [00000239] stream_out_transcode private debug: codec audio=mpga 0Hz 2
> channels 192Kb/s
> [00000239] stream_out_transcode private debug: codec video=mp4v 0x0
> scaling: 1.000000 1024kb/s
> [00000249] main private debug: looking for sub filter module: 1 candidate
> [00000249] main private debug: using sub filter module "time"
> [00000248] main private debug: Registering subpicture channel, ID: 2
> [00000239] main private debug: using sout stream module
> "stream_out_transcode"
> [00000237] main private debug: using sout stream module
> "stream_out_duplicate"
> [00000234] main input debug: `v4l://' gives access `v4l' demux `' path `'
> [00000234] main input debug: creating demux: access='v4l' demux='' path=''
> [00000251] main demuxer debug: looking for access_demux module: 1
> candidate
> [00000251] v4l demuxer debug: V4L device BT878 video (ProVideo PV150) 2
> channels 0 audios 48 < w < 768 32 < h < 480
> [00000251] v4l demuxer debug: setting channel Composite0(0) 0 tuners
> flags=0x2 type=0x2 norm=0x1
> [00000251] v4l demuxer error: cannot set audio (Invalid argument)
> [00000251] v4l demuxer debug: openened adev=`/dev/audio' stereo 44100Hz
> [00000251] v4l demuxer debug: v4l grabbing started
> [00000251] v4l demuxer debug: new audio es 2 channels 44100Hz
> [00000234] main input debug: selecting program id=0
> [00000251] main demuxer debug: using access_demux module "v4l"
> [00000253] main packetizer debug: looking for packetizer module: 14
> candidates
> [00000253] main packetizer debug: using packetizer module
> "packetizer_copy"
> [00000253] main packetizer debug: thread 131081 (decoder) created at
> priority 0 (input/decoder.c:159)
> [00000234] main input debug: starting in sync mode
> [00000234] main input debug: `v4l://' successfully opened
> status change: ( new input: v4l:// )
> status change: ( audio volume: 256 )
> status change: ( play state: 1 )
> [00000236] main stream output debug: adding a new input
> [00000237] stream_out_duplicate private debug: duplicated a new stream
> codec=s16l (es=0 group=0)
> [00000239] stream_out_transcode private debug: creating audio
> transcoding from fcc=`s16l' to fcc=`mpga'
> [00000276] main decoder debug: looking for decoder module: 17 candidates
> [00000276] araw decoder debug: samplerate:44100Hz channels:2
> bits/sample:16
> [00000276] main decoder debug: using decoder module "araw"
> [00000277] main encoder debug: looking for encoder module: 4 candidates
> [00000277] ffmpeg encoder debug: libavcodec initialized (interface 3352064
> )
> [00000277] ffmpeg encoder debug: found encoder MPEG Audio layer 1/2
> [00000277] main encoder debug: using encoder module "ffmpeg"
> [00000247] main private debug: adding a new input
> [00000247] mux_ts private debug: adding input codec=mpga pid=68
> [00000247] mux_ts private debug: new PCR PID is 68
> [00000237] stream_out_duplicate private debug:     - added for output 0
> [00000239] stream_out_transcode private debug: drift is too high,
> resetting master sync
>
> ****
>
>
--sout-all???

--sout-all, --no-sout-all
Enable streaming of all ES (default disabled)
Stream all elementary streams (video, audio and subtitles) (default disabled)


-- 
Alejandro Vazquez Fente
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