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

[Kfir Lavi]

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