I can see video image using the 'luvcview' program. This indicates that the webcam hardware is working. I can use mplayer to display the webcam image. But when I try to use mencoder to record the webcam stream, it causes a floating point exception. Any help is greatly appreciated Thanks in advance. My system spec: opensuse 11.2 32bit with KDE Creative webcam NX Pro (usb webcam) $ uname -a Linux myhostname 2.6.31.12-0.2-default #1 SMP 2010-03-16 21:25:39 +0100 i686 i686 i386 GNU/Linux $ lsusb Bus 001 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 001 Device 002: ID 041e:401e Creative Technology, Ltd Webcam NX Pro Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 002 Device 002: ID 046d:c016 Logitech, Inc. M-UV69a/HP M-UV96 Optical Wheel Mouse # lspci 00:00.0 Host bridge: Intel Corporation 82845 845 [Brookdale] Chipset Host Bridge (rev 04) 00:01.0 PCI bridge: Intel Corporation 82845 845 [Brookdale] Chipset AGP Bridge (rev 04) 00:1d.0 USB Controller: Intel Corporation 82801CA/CAM USB Controller #1 (rev 02) 00:1d.1 USB Controller: Intel Corporation 82801CA/CAM USB Controller #2 (rev 02) 00:1e.0 PCI bridge: Intel Corporation 82801 Mobile PCI Bridge (rev 42) 00:1f.0 ISA bridge: Intel Corporation 82801CAM ISA Bridge (LPC) (rev 02) 00:1f.1 IDE interface: Intel Corporation 82801CAM IDE U100 Controller (rev 02) 00:1f.5 Multimedia audio controller: Intel Corporation 82801CA/CAM AC'97 Audio Controller (rev 02) 00:1f.6 Modem: Intel Corporation 82801CA/CAM AC'97 Modem Controller (rev 02) 01:00.0 VGA compatible controller: nVidia Corporation NV17 [GeForce4 420 Go] (rev a3) 02:08.0 Ethernet controller: Intel Corporation 82801CAM (ICH3) PRO/100 VE (LOM) Ethernet Controller (rev 42) 02:0b.0 CardBus bridge: Toshiba America Info Systems ToPIC100 PCI to Cardbus Bridge with ZV Support (rev 32) 02:0b.1 CardBus bridge: Toshiba America Info Systems ToPIC100 PCI to Cardbus Bridge with ZV Support (rev 32) 02:0d.0 System peripheral: Toshiba America Info Systems SD TypA Controller (rev 03) >>>luvcview is working ok. I can see the video stream. $ luvcview -v /dev/video0 -i 25 -s 640x480 luvcview version 0.2.1 interval: 25 fps size width: 640 height: 480 Video driver: x11 A window manager is available video /dev/video0 Stop asked Clean Up done Quit >>>Mplayer is able to display the webcam stream with this command $ mplayer tv:// -tv driver=v4l2:device=/dev/video0:fps=10:width=640:height=480 -vf scale=640:480 MPlayer SVN-r30725-4.4 (C) 2000-2010 MPlayer Team Playing tv://. TV file format detected. Selected driver: v4l2 name: Video 4 Linux 2 input author: Martin Olschewski <olschewski at zpr.uni-koeln.de> comment: first try, more to come ;-) v4l2: your device driver does not support VIDIOC_G_STD ioctl, VIDIOC_G_PARM was used instead. Selected device: USB Camera (041e:401e) Capabilites: video capture read/write streaming supported norms: inputs: 0 = zc3xx; Current input: 0 Current format: unknown (0x4745504a) tv.c: norm_from_string(pal): Bogus norm parameter, setting default. v4l2: ioctl enum norm failed: Invalid argument Error: Cannot set norm! Selected input hasn't got a tuner! v4l2: Cannot get fps v4l2: ioctl set mute failed: Invalid argument v4l2: ioctl query control failed: Invalid argument v4l2: ioctl query control failed: Invalid argument Opening video filter: [scale w=640 h=480] ========================================================================== Opening video decoder: [ffmpeg] FFmpeg's libavcodec codec family Selected video codec: [ffmjpeg] vfm: ffmpeg (FFmpeg MJPEG) ========================================================================== Audio: no sound Starting playback... Movie-Aspect is undefined - no prescaling applied. [swscaler @ 0x8ac4400]using unscaled yuv422p -> yuyv422 special converter VO: [xv] 640x480 => 640x480 Packed YUY2 v4l2: ioctl set mute failed: Invalid argument v4l2: 54 frames successfully processed, -14 frames dropped. Exiting... (Quit) >>>When I try to record the webcam video stream, mencoder exits with a floating point exception. $ mencoder -v tv:// -tv driver=v4l2:device=/dev/video0:width=640:height=480:amode=0:forceaudio:audiorate=32000 -ovc lavc -lavcopts vcodec=mpeg4:acodec=libmp3lame:aspect=4/3:gray -ffourcc DX50 -oac mp3lame -lameopts vol=10:mode=3:preset=standard:highpassfreq=0:lowpassfreq=17500 -o myvid-yyyymmdd-00.avi MEncoder SVN-r30725-4.4 (C) 2000-2010 MPlayer Team Configuration: --prefix=/usr/local/bin/mplayer20100224 init_freetype Using MMX (with tiny bit MMX2) Optimized OnScreenDisplay STREAM: [tv] tv:// STREAM: Description: TV Input STREAM: Author: Benjamin Zores, Albeu STREAM: Comment: success: format: 9 data: 0x0 - 0x0 TV file format detected. Selected driver: v4l2 name: Video 4 Linux 2 input author: Martin Olschewski <olschewski at zpr.uni-koeln.de> comment: first try, more to come ;-) v4l2: your device driver does not support VIDIOC_G_STD ioctl, VIDIOC_G_PARM was used instead. Selected device: USB Camera (041e:401e) Capabilites: video capture read/write streaming supported norms: inputs: 0 = zc3xx; Current input: 0 Format unknown (0x4745504a) ( 0 bits, JPEG): Unknown 0x4745504a Current format: unknown (0x4745504a) v4l2: set format: YVU420 v4l2: set input: 0 tv.c: norm_from_string(pal): Bogus norm parameter, setting default. Selected norm : pal v4l2: ioctl enum norm failed: Invalid argument Error: Cannot set norm! v4l2: set width: 640 v4l2: set height: 480 Selected input hasn't got a tuner! ==> Found video stream: 0 v4l2: get format: unknown (0x4745504a) v4l2: Cannot get fps v4l2: get width: 640 v4l2: get height: 480 ioctl dsp getfmt: 0 Supported formats: 5b1f9 ioctl dsp setfmt: 0 ioctl dsp stereo: 0 (req: 1) ioctl dsp speed: 0 ioctl dsp trigger: 0 trigger: 1 ioctl dsp trigger: 0 ioctl dsp getblocksize: 0 blocksize: 4096 Audio block size too low, setting to 16384! v4l2: set audio samplerate: 32000 v4l2: get audio format: 9 ==> Found audio stream: 0 v4l2: get audio samplerate: 32000 v4l2: get audio samplesize: 2 v4l2: get audio channels: 2 TV audio: 2 channels, 16 bits, 32000 Hz Audio capture - buffer 1063 blocks of 16384 bytes, skew average from 16 meas. Floating point exception
