[MPlayer-users] Playing from v4l

[Jerome Etienne]

as a side note, i succeed to have sound from my webcam using xawtv.
i never tried to do it with mplayer, so i dont know mplayer to make
mplayer do it

On Fri, Nov 07, 2003 at 10:18:41AM -0800, Todd Lyons wrote:
> [Automatic answer: RTFM (read DOCS, FAQ), also read DOCS/bugreports.html]
> I'm trying to play and later archive video/sound from a v4l device.  The
> driver (bttv and btaudio) are both successfully loaded, see below for dmesg
> output.  Video displays properly with no problems.  But no sound is played.
> Am I mistaken in thinking that I can have mplayer grab video/audio (physical
> devices video0 and dsp1) from the capture card and play the video back on
> the screen with audio out through /dev/dsp (my regular sound chip)?  I've
> monitored system load with top and it's practically idle, so it's not load
> related.
> 
> Hmmm, that sounds like I worded something wrong.  I should be trying to use
> the ALSA plugin since ALSA is running.  But I don't think that's my issue as
> I haven't gotten any file lock errors, meaning it doesn't even look like
> it's trying to open /dev/dsp.  I'm kind of lost as to what to try next.
> I've not studied any of the lavc options yet, so that may have some bearing
> on my state of being lost.
> 
> (The next step is to make it archive the stream.  Then the final step is to
> get mplayer or gmplayer working with whatever file format we end up using.
> But those are later, once I get regular streaming working properly.)
> 
> System info:  P4 1.7GHz, 512 Megs RAM, Osprey 210 (BT878), Mandrake 9.2,
> Mplayer 1.0 (precompiled from PLF), win codecs, ALSA sound drivers, devfs
> enabled.
> 
> These are the commandlines that I've tried.  Note that in almost all of
> them, the video works normally, but the sound never does.  There are some
> obvious ones that do something different such as 921 or the lines with
> syntax errors.  (Half of the battle is figuring out which options are
> relevant to mplayer versus mencoder versus both).  I've culled all the
> "help" and "man" options out of this grep.
> 
>   896  mplayer tv:// -tv driver=v4l:width=640:height=480:outfmt=i420 -vc
> rawi420 -vo xv
>   898  mplayer tv:// -tv driver=v4l:width=640:height=480:outfmt=i420 -vc
> rawi420 -vo xv
>   899  mplayer tv:// -tv driver=v4l:outfmt=i420 -vc rawi420 -vo xv
>   900  mplayer tv:// -tv driver=v4l:width=320:height=240:outfmt=i420 -vc
> rawi420 -vo xv
>   901  mplayer tv:// -tv driver=v4l:width=320:height=240 -vc rawi420 -vo xv
>   902  mplayer tv:// -tv driver=v4l:width=320:height=240:outfmt=i420 -vo xv
>   903  mplayer tv:// -tv driver=v4l:width=320:height=240:outfmt=i420 -vc
> rawi420
>   904  mplayer tv:// -tv driver=v4l:width=320:height=240:outfmt=i420 -vc
> rawi420 -vo xv
>   908  mplayer tv:// -tv driver=v4l:width=320:height=240:outfmt=i420 -vc
> rawi420 -vo x11
>   909  mplayer tv:// -tv driver=v4l:width=320:height=240:outfmt=i420 -vc
> rawi420 -vo gl
>   910  mplayer tv:// -tv driver=v4l:width=320:height=240:outfmt=i420 -vc
> rawi420 -vo gl2
>   911  mplayer tv:// -tv driver=v4l:width=320:height=240:outfmt=i420 -vc
> rawi420 -vo xv
>   912  mplayer tv:// -tv driver=v4l:width=320:height=240:outfmt=i420 -vc
> rawi420 -vo png
>   918  mplayer tv:// -tv driver=v4l:width=320:height=240:outfmt=i420 -vc
> rawi420 -vo png
>   921  mplayer "*.png"
>   978  mplayer tv:// -tv driver=v4l:width=640:height=480:outfmt=i420 -vc
> rawi420 -vo
>   979  mplayer tv:// -tv
> driver=v4l:width=640:height=480:outfmt=i420:norm=ntsc -vc rawi420 -vo xv
>   980  mplayer tv:// -tv
> driver=v4l:width=640:height=480:outfmt=i420:norm=ntsc -vc rawi420
>   987  mplayer tv:// -tv
> driver=v4l:width=640:height=480:outfmt=i420:norm=ntsc -vc rawi420
>   990  mplayer tv:// -tv
> driver=v4l:width=640:height=480:outfmt=i420:norm=ntsc -vc rawi420 -oac
> mp3lame
>   991  mplayer tv:// -tv
> driver=v4l:width=640:height=480:outfmt=i420:norm=ntsc -vc rawi420
>   992  mplayer tv:// -tv
> driver=v4l:width=640:height=480:outfmt=i420:norm=ntsc:adevice=/dev/dsp1 -vc
> rawi420
>   993  mplayer tv:// -tv
> driver=v4l:width=640:height=480:outfmt=i420:norm=ntsc:adevice=/dev/mixer1
> -vc rawi420
>   994  mplayer tv:// -tv
> driver=v4l:width=640:height=480:outfmt=i420:norm=ntsc:adevice=/dev/dsp2 -vc
> rawi420
>   995  mplayer tv:// -tv
> driver=v4l:width=640:height=480:outfmt=i420:norm=ntsc:adevice=/dev/dsp2:amod
> e=2 -vc rawi420
>   996  mplayer tv:// -tv
> driver=v4l:width=640:height=480:outfmt=i420:norm=ntsc:amode=2 -vc rawi420
>   997  mplayer tv:// -tv
> driver=v4l:width=640:height=480:outfmt=i420:norm=ntsc:amode=2 -vc rawi420
> -ao alsa:/dev/dsp
>   998  mplayer tv:// -tv
> driver=v4l:width=640:height=480:outfmt=i420:norm=ntsc:amode=2 -vc rawi420
> -ao alsa:/dev/dsp -mixer /dev/mixer1
> 
> Dmesg output:
> i2c-core.o: i2c core module version 2.8.0 (20030714)
> Linux video capture interface: v1.00
> bttv: driver version 0.7.107 loaded
> bttv: using 4 buffers with 2080k (8320k total) for capture
> bttv: Host bridge is Silicon Integrated Systems [SiS] 650 Host
> bttv: Bt8xx card found (0).
> bttv0: Bt878 (rev 17) at 00:09.0, irq: 11, latency: 32, mmio: 0xec102000
> bttv0: detected: Osprey-200 [card=88], PCI subsystem ID is 0070:ff01
> bttv0: using: BT878(Osprey 200/250) [card=88,autodetected]
> bttv0: osprey eeprom: card=89 name=Osprey 210/220 serial=3040275
> bttv0: using tuner=-1
> bttv0: PLL: 28636363 => 35468950 .. ok
> bttv0: registered device video0
> bttv0: registered device vbi0
> bttv0: PLL can sleep, using XTAL (28636363).
> bttv0: PLL: 28636363 => 35468950 .. ok
> bttv0: PLL can sleep, using XTAL (28636363).
> bttv0: PLL: 28636363 => 35468950 .. ok
> bttv0: PLL can sleep, using XTAL (28636363).
> bttv0: PLL: 28636363 => 35468950 .. ok
> bttv0: PLL can sleep, using XTAL (28636363).
> bttv0: PLL: 28636363 => 35468950 .. ok
> bttv0: PLL can sleep, using XTAL (28636363).
> bttv0: PLL: 28636363 => 35468950 .. ok
> bttv0: PLL can sleep, using XTAL (28636363).
> bttv0: PLL: 28636363 => 35468950 .. Ok
> btaudio: driver version 0.7 loaded [digital+analog]
> btaudio: Bt878 (rev 17) at 00:09.1, irq: 11, latency: 32, mmio: 0xec103000
> btaudio: using card config "Osprey 200"
> btaudio: registered device dsp1 [digital]
> btaudio: registered device dsp2 [analog]
> 
> Comments welcome!  I don't claim to be an expert on video, nor do I claim to
> be an expert on mplayer, so please point me in the direction or point me to
> URLs.  I've pored over the docs at mplayerhq.hu and they're good, but I'm
> hoping to find more of a tutorial than a technical reference (damn I feel
> like a newbie cause that's what every single one of them says about man
> pages).  I suppose that the more complex the commandline options get, the
> more comfortable a tutorial becomes for a newbie as opposed to technical
> guides.
> 
> Regards...                      Todd
> 
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