Re: [gentoo-user] No Sound while video capturing with guvcview

Kfir Lavi <lavi.kfir@×××××.com> [11-05-08 11:32]:
> On Sun, May 8, 2011 at 12:00 PM, <meino.cramer@×××.de> wrote:
>
> > Hi,
> >
> > may be one can help me...
> >
> > I am using a webcam (lsusb: Bus 001 Device 002: ID 1415:2000 Nam Tai
> > E&E Products Ltd. or OmniVision Technologies, Inc. Sony Playstation
> > Eye) on my window board to capture videos from the crow, which often
> > visits me  in summer.
> >
> > The PS-Eye cam has one (four?) microphones to capture audio and
> > delivers up to 60 fps.
> >
> > The setup was working last summer with video AND audio.
> >
> > This summer only video is captured. The resulting video file
> > seems to contain a "null audio" (no sound samples other than
> > zeroes...)
> >
> > When playing the file with mplayer, this is the output on the terminal
> > (the video plays ok beside the fact that there is no sound to hear...)
> >
> >    [aviheader] Video stream found, -vid 0
> >    [aviheader] Audio stream found, -aid 1
> >
> >    Badly interleaved AVI file detected - switching to -ni mode...
> >    AVI: No audio stream found -> no sound.
> >    VIDEO:  [MJPG]  640x480  24bpp  60.094 fps  29695.7 kbps (3625.0
> > kbyte/s)
> >    Clip info:
> >    Title:
> >    Software: guvcview-1.4.5
> >    Comments:      Sun May  8 09:51:35 2011
> >
> >  ==========================================================================
> >    Opening video decoder: [ffmpeg] FFmpeg's libavcodec codec family
> >    Selected video codec: [ffmjpeg] vfm: ffmpeg (FFmpeg MJPEG)
> >
> >  ==========================================================================
> >
> >  ==========================================================================
> >    Opening audio decoder: [pcm] Uncompressed PCM audio decoder
> >    AUDIO: 44100 Hz, 1 ch, s16le, 705.6 kbit/100.00% (ratio: 88200->88200)
> >    Selected audio codec: [pcm] afm: pcm (Uncompressed PCM)
> >
> >  ==========================================================================
> >    AO: [alsa] 48000Hz 1ch s16le (2 bytes per sample)
> >    Starting playback...
> >    Movie-Aspect is undefined - no prescaling applied.
> >    VO: [gl2] 640x480 => 640x480 Planar 422P
> >    [gl2] You have OpenGL >= 1.2 capable drivers, GOOD (16bpp and BGR is
> > ok!)
> >    [gl2] antialiasing off
> >    [gl2] bilinear linear
> >    A:  -0.0 V:   1.3 A-V: -1.265 ct: -0.126  77/ 77 14% 88%  0.0% 0 0
> >    Capturing not enabled (forgot -capture parameter?)
> >    A:  -0.0 V:  14.8 A-V:-14.844 ct: -1.486 893/893 10% 89%  0.0% 0 0
> >
> > What can I do/check/test/experiment to get back the audio again....?
> >
> > Thank you very much for any help in advance!
> >
> > Have a nice sunday!
> > Best regards
> > mcc
> >
> >
> > From your output it shows that the sound is not null.
> Does your sound works playing other files (alsamixer)?
> Can you record now a picture with the webcam and play it with sound after?
>
> Kfir

Hi Kfir,

thank you for your reply! :)

sorry, English isn't my mothers tongue...

When playing other videos there is no problem with the sound.

What did you mean with 

    "Can you record now a picture with the webcam and play it with sound after?"


mcc