Webcam audio skips causing asynchronous audio/video using GUVCView

[finny388]

I tried Cheese but it would hang when I clicked record and create 0 byte files.

I tried Kasomo but the videos would play back at 3x speed with no sound.

Finally I tried GUVCViewer and it appeared to work but now I find the video and audio are out of sync.

In a 9 min video the audio will finish 30 sec before the video.
The audio skips fwd intermittently by a second or two while the video rolls on meaning parts of the audio are missing and causing it to pull out of sync further and further.

I tried changing audio sample rate from default to:
8,000 - VLC said the video was broken and only played 2 seconds then video froze.
22,050 - Audio skipped just as before

My settings in GUVCView:
AUDIO

• Input Device: /dev/dsp (other choices are 'default' or 'HDA Intel: ALC662 rev1 Analog (hw:0,0))
• Sample Rate: Dev. Default (choices range from 8,00 - 96,000)
• Channels: Dev. Default (mono or stereo)
• Audio Format:MP2 (or PCM)

VIDEO

• Device: USB 2.0 Camera (no other choice)
• Frame Rate: 1/30 fps (no other choice)
• Resolution: 320x240 (I changed it from default 640x480)
• Camera Output: YUYV (no other choice)
• Video Codec: YUY2 - uncomp YUV (8 other choices - I figured uncompressed would be fastest)
• Video Format: AVI (other choice is MKV)

I am running Kubuntu 9.10 on an eee-pc 900:

• CPU: Intel Celeron M ULV 900MHz
• RAM: 1GB DDR2 RAM (667MHz)
• Video: Integrated Intel GMA 900 GPU
• Audio: Integrated Intel HDA ALC662 rev1 analog
• Cam: 1.3 MP webcam

Any thoughts out there on how to correct this?

[vinnywright]

Re: Webcam audio skips causing asynchronous audio/video using GUVCView

see what hapens if you record it with VLC media>open capture device ... and see how well it dose at recording you..

VINNY

[GreyGeek]

Re: Webcam audio skips causing asynchronous audio/video using GUVCView

http://blog.raphinou.com/2007/08/bui...h-vlc-ion.html

[vinnywright]

Re: Webcam audio skips causing asynchronous audio/video using GUVCView

http://blog.raphinou.com/2007/08/bui...h-vlc-ion.html

nice link ................I just put /dev/video0 in the "video device name" feald when you click open capture device and then the record button and VLC gave me a nice .avi in ~/ ... :P

VINNY

[GreyGeek]

Re: Webcam audio skips causing asynchronous audio/video using GUVCView

If you have the newer version of VLC you can use this method: http://techistan.blogspot.com/2010/0...viewebcam.html

[GreyGeek]

Re: Webcam audio skips causing asynchronous audio/video using GUVCView

.......

I am running Kubuntu 9.10 on an eee-pc 900:

• CPU: Intel Celeron M ULV 900MHz
• RAM: 1GB DDR2 RAM (667MHz)
• Video: Integrated Intel GMA 900 GPU
• Audio: Integrated Intel HDA ALC662 rev1 analog
• Cam: 1.3 MP webcam

Any thoughts out there on how to correct this?

I'm not sure you can. 900MHz CPU speed is pretty limiting.

guvcview gives a very fast video output. It would be hard to create a video with higher video and audio rates.

[Detonate]

Re: Webcam audio skips causing asynchronous audio/video using GUVCView

Check out Paulo Assis's site at:

http://developer.berlios.de/projects/guvcview/

He has always been very helpful to me.

[finny388]

Re: Webcam audio skips causing asynchronous audio/video using GUVCView

Thanks for the replies.

I'd like to try VLC (b/c it's already installed) or tone down GUVC since it almost works.
So I'm going look at VLC first:

Video works fine but no audio:

Your input can't be opened:
VLC is unable to open the MRL 'alsa:///dev/dsp'. Check the log for details.

I use /dev/dsp in GUVC so I find this odd.

I found camera identified in the folder '/dev/v4l/by-id/

Should I find the microphone there or where to look?

Vinnie, did you get sound?
thx

btw, Greygeek I found the record buttons under View/Adv... thanks

[vinnywright]

Re: Webcam audio skips causing asynchronous audio/video using GUVCView

@finny388 ...........no I couldent test sound as I dont have a mic ........I'm acualey surprised the cam worked as old as it is

the old A$$ mic I had got it's plug riped off by my nefue accedentley OOps

VINNY