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

[Kfir Lavi <lavi.kfir@gmail.com>]

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On Sun, May 8, 2011 at 12:35 PM, <meino.cramer@gmx.de> wrote:

> Kfir Lavi <lavi.kfir@gmail.com> [11-05-08 11:32]:
> > On Sun, May 8, 2011 at 12:00 PM, <meino.cramer@gmx.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
>
>
> You said that this file is a recording of the webcam with sound.
Can you record again from your webcam and then play the file?
Does the file you record is the same compression algorithm as the file that
doesn't work?

Kfir

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