[MPlayer-users] Using mencoder to record from pwc webcam
Nicholas Piper
nick-mplayer at nickpiper.co.uk
Sun Apr 20 01:33:04 CEST 2003
Hi everyone,
I can get both a picture or audio from my PWC webcam, but not both at
the same time.
Using a command such as :
mencoder
-tv on:driver=v4l:width=640:height=480:adevice=/dev/dsp3:device=/dev/video0
-o /tmp/output.avi
-ovc lavc -lavcopts vcodec=mpeg4:vbitrate=900
-oac mp3lame -lameopts cbr:br=32
I get sound taken from my webcam, and a picture from my TV card (on
/dev/video0).
If I put device=/dev/video1 instead, I get a picture from the webcam,
but no sound.
It seems that it needs some response that the TV card gives it, before
it will enable sound recording.
I've tried with :forceaudio: and :forcechan=1:, with no
chance. forcechan=2 gives "Unable to set stereo: 1"
Below are some snippets from stdout, for both using video0 and video1.
Thanks for any help,
Nick
With device=/dev/video0
mencoder -tv on:driver=v4l:width=640:height=480:adevice=/dev/dsp3:device=/dev/video0 -o /tmp/output.avi -ovc lavc -lavcopts vcodec=mpeg4:vbitrate=900 -oac mp3lame -lameopts cbr:br=32
Selected driver: v4l
name: Video 4 Linux input
author: Alex Beregszaszi <alex at naxine.org>
comment: under development
Selected device: BT878(Hauppauge (bt878))
Capabilites: capture tuner overlay clipping frameram scales
Device type: 235
Supported sizes: 48x32 => 924x576
Inputs: 4
0: Television: tuner audio tv camera (tuner:1, norm:pal)
1: Composite1: audio camera (tuner:0, norm:pal)
2: S-Video: audio camera (tuner:0, norm:pal)
3: Composite3: audio camera (tuner:0, norm:pal)
audio block size too low, setting to 8192!
Using input 'Television'
[V] filefmt:9 fourcc:0x32315659 size:640x480 fps:25.00 ftime:=0.0400
==========================================================================
Opening audio decoder: [pcm] Uncompressed PCM audio decoder
AUDIO: 44100 Hz, 1 ch, 16 bit (0x10), ratio: 88200->88200 (705.6 kbit)
Selected audio codec: [pcm] afm:pcm (Uncompressed PCM)
==========================================================================
Opening video filter: [expand=-1:-1:-1:-1:1]
Expand: -1 x -1, -1 ; -1 (-1=autodetect) osd: 1
==========================================================================
Opening video decoder: [raw] RAW Uncompressed Video
VDec: vo config request - 640 x 480 (preferred csp: Planar YV12)
VDec: using Planar YV12 as output csp (no 0)
Movie-Aspect is undefined - no prescaling applied.
videocodec: libavcodec (640x480 fourcc=58564944 [DIVX])
Selected video codec: [rawyv12] vfm:raw (RAW YV12)
==========================================================================
MP3 audio selected
Building audio filter chain for 44100Hz/1ch/16bit -> 44100Hz/1ch/16bit...
Writing AVI header...
Forcing audio preload to 0, max pts correction to 0
Pos: 45.2s 1129f ( 0%) 25fps Trem: 0min 0mb A-V:0.000 [920:31]]
------------------------------------------------------------------------------------
With device=/dev/video1
mencoder -tv on:driver=v4l:width=640:height=480:adevice=/dev/dsp3:device=/dev/video1 -o /tmp/output.avi -ovc lavc -lavcopts vcodec=mpeg4:vbitrate=900 -oac mp3lame -lameopts cbr:br=32
Selected driver: v4l
name: Video 4 Linux input
author: Alex Beregszaszi <alex at naxine.org>
comment: under development
Selected device: Philips 740 webcam
Capabilites: capture
Device type: 1
Supported sizes: 160x120 => 640x480
Inputs: 1
0: Webcam: (tuner:0, norm:pal)
audio block size too low, setting to 8192!
Using input 'Webcam'
Selected input hasn't got a tuner!
[V] filefmt:9 fourcc:0x32315659 size:640x480 fps:25.00 ftime:=0.0400
Opening video filter: [expand=-1:-1:-1:-1:1]
Expand: -1 x -1, -1 ; -1 (-1=autodetect) osd: 1
==========================================================================
Opening video decoder: [raw] RAW Uncompressed Video
VDec: vo config request - 640 x 480 (preferred csp: Planar YV12)
VDec: using Planar YV12 as output csp (no 0)
Movie-Aspect is undefined - no prescaling applied.
videocodec: libavcodec (640x480 fourcc=58564944 [DIVX])
Selected video codec: [rawyv12] vfm:raw (RAW YV12)
==========================================================================
Writing AVI header...
Forcing audio preload to 0, max pts correction to 0
Pos: 11.4s 103f ( 0%) 9fps Trem: 0min 0mb A-V:0.000 [377:0]
--
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