<div class="gmail_quote">On Mon, Oct 11, 2010 at 5:03 PM, Gary Thomas <<a href="mailto:gary@mlbassoc.com">gary@mlbassoc.com</a>> wrote: <blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;"> Note: this *is* a duplicate of an email sent last week. Does anyone have any ideas about this, please? I really need to get this USB camera working on my embedded OMAP board... Thanks I have an old USB webcam (Logitech QuickCam Chat) that I'm trying to use with v4l2src. When I run it on slightly different versions of Linux & gst-plugins, I get very different results. On x86 Linux 2.6.30, gstreamer-0.10.25, gstreamer-plugins-good-0.10.16, I get these: <v4l2src0> probed caps: video/x-raw-yuv, format=(fourcc)I420, framerate=(fraction)[ 0/1, 100/1 ], width=(int)[ 160, 352 ], height=(int)[ 120, 288 ]; video/x-raw-yuv, format=(fourcc)YV12, framerate=(fraction)[ 0/1, 100/1 ], width=(int)[ 160, 352 ], height=(int)[ 120, 288 ]; video/x-raw-rgb, bpp=(int)24, depth=(int)24, red_mask=(int)255, green_mask=(int)65280, blue_mask=(int)16711680, endianness=(int)4321, framerate=(fraction)[ 0/1, 100/1 ], width=(int)[ 160, 352 ], height=(int)[ 120, 288 ]; video/x-raw-rgb, bpp=(int)24, depth=(int)24, red_mask=(int)16711680, green_mask=(int)65280, blue_mask=(int)255, endianness=(int)4321, framerate=(fraction)[ 0/1, 100/1 ], width=(int)[ 160, 352 ], height=(int)[ 120, 288 ] On x86 Linux 2.6.34, gstreamer-0.10.30, gstreamer-plugins-good-0.10.25, I get these: 0:00:00.037755702 22728 0x9eec050 DEBUG v4l2 gstv4l2object.c:882:gst_v4l2_object_fill_format_list:<v4l2src0> getting src format enumerations 0:00:00.037806177 22728 0x9eec050 INFO v4l2 gstv4l2object.c:919:gst_v4l2_object_fill_format_list:<v4l2src0> got 4 format(s): 0:00:00.037831421 22728 0x9eec050 INFO v4l2 gstv4l2object.c:925:gst_v4l2_object_fill_format_list:<v4l2src0> YU12 (emulated) 0:00:00.037853538 22728 0x9eec050 INFO v4l2 gstv4l2object.c:925:gst_v4l2_object_fill_format_list:<v4l2src0> YV12 (emulated) 0:00:00.037886708 22728 0x9eec050 INFO v4l2 gstv4l2object.c:925:gst_v4l2_object_fill_format_list:<v4l2src0> BGR3 (emulated) 0:00:00.037908230 22728 0x9eec050 INFO v4l2 gstv4l2object.c:925:gst_v4l2_object_fill_format_list:<v4l2src0> RGB3 (emulated) <v4l2src0> probed caps: video/x-raw-yuv, format=(fourcc)I420, width=(int)352, height=(int)288, framerate=(fraction)[ 0/1, 100/1 ]; video/x-raw-yuv, format=(fourcc)I420, width=(int)320, height=(int)240, framerate=(fraction)[ 0/1, 100/1 ]; video/x-raw-yuv, format=(fourcc)I420, width=(int)176, height=(int)144, framerate=(fraction)[ 0/1, 100/1 ]; video/x-raw-yuv, format=(fourcc)I420, width=(int)160, height=(int)120, framerate=(fraction)[ 0/1, 100/1 ]; video/x-raw-yuv, format=(fourcc)YV12, width=(int)352, height=(int)288, framerate=(fraction)[ 0/1, 100/1 ]; video/x-raw-yuv, format=(fourcc)YV12, width=(int)320, height=(int)240, framerate=(fraction)[ 0/1, 100/1 ]; video/x-raw-yuv, format=(fourcc)YV12, width=(int)176, height=(int)144, framerate=(fraction)[ 0/1, 100/1 ]; video/x-raw-yuv, format=(fourcc)YV12, width=(int)160, height=(int)120, framerate=(fraction)[ 0/1, 100/1 ]; video/x-raw-rgb, bpp=(int)24, depth=(int)24, red_mask=(int)255, green_mask=(int)65280, blue_mask=(int)16711680, endianness=(int)4321, width=(int)352, height=(int)288, framerate=(fraction)[ 0/1, 100/1 ]; video/x-raw-rgb, bpp=(int)24, depth=(int)24, red_mask=(int)255, green_mask=(int)65280, blue_mask=(int)16711680, endianness=(int)4321, width=(int)320, height=(int)240, framerate=(fraction)[ 0/1, 100/1 ]; video/x-raw-rgb, bpp=(int)24, depth=(int)24, red_mask=(int)255, green_mask=(int)65280, blue_mask=(int)16711680, endianness=(int)4321, width=(int)176, height=(int)144, framerate=(fraction)[ 0/1, 100/1 ]; video/x-raw-rgb, bpp=(int)24, depth=(int)24, red_mask=(int)255, green_mask=(int)65280, blue_mask=(int)16711680, endianness=(int)4321, width=(int)160, height=(int)120, framerate=(fraction)[ 0/1, 100/1 ]; video/x-raw-rgb, bpp=(int)24, depth=(int)24, red_mask=(int)16711680, green_mask=(int)65280, blue_mask=(int)255, endianness=(int)4321, width=(int)352, height=(int)288, framerate=(fraction)[ 0/1, 100/1 ]; video/x-raw-rgb, bpp=(int)24, depth=(int)24, red_mask=(int)16711680, green_mask=(int)65280, blue_mask=(int)255, endianness=(int)4321, width=(int)320, height=(int)240, framerate=(fraction)[ 0/1, 100/1 ]; video/x-raw-rgb, bpp=(int)24, depth=(int)24, red_mask=(int)16711680, green_mask=(int)65280, blue_mask=(int)255, endianness=(int)4321, width=(int)176, height=(int)144, framerate=(fraction)[ 0/1, 100/1 ]; video/x-raw-rgb, bpp=(int)24, depth=(int)24, red_mask=(int)16711680, green_mask=(int)65280, blue_mask=(int)255, endianness=(int)4321, width=(int)160, height=(int)120, framerate=(fraction)[ 0/1, 100/1 ] On ARM Linux 2.6.32, gstreamer-0.10.30, gst-plugins-good-0.10.25, I get this (but not useful) trace: 0:00:00.180328399 741 0x15050 INFO v4l2 gstv4l2object.c:919:gst_v4l2_object_fill_format_list:<v4l2src0> got 2 format(s): 0:00:00.180450469 741 0x15050 INFO v4l2 gstv4l2object.c:925:gst_v4l2_object_fill_format_list:<v4l2src0> GBRG 0:00:00.180603057 741 0x15050 INFO v4l2 gstv4l2object.c:925:gst_v4l2_object_fill_format_list:<v4l2src0> S561 0:00:00.180725127 741 0x15050 DEBUG v4l2 gstv4l2object.c:1151:gst_v4l2_object_v4l2fourcc_to_structure: Unknown fourcc 0x47524247 GBRG 0:00:00.184051543 741 0x15050 DEBUG v4l2src gstv4l2src.c:578:gst_v4l2src_get_caps:<v4l2src0> unknown format 1196573255 0:00:00.184387236 741 0x15050 DEBUG v4l2 gstv4l2object.c:1151:gst_v4l2_object_v4l2fourcc_to_structure: Unknown fourcc 0x31363553 S561 0:00:00.184509307 741 0x15050 DEBUG v4l2src gstv4l2src.c:578:gst_v4l2src_get_caps:<v4l2src0> unknown format 825636179 0:00:00.184661894 741 0x15050 INFO v4l2src gstv4l2src.c:584:gst_v4l2src_get_caps:<v4l2src0> probed caps: EMPTY Same camera, same (+/- kernel version) kernel modules, vastly different behaviour. What gives? More importantly, what do I need to do on my ARM system to get useful caps out of this camera? * Kernel module settings/build options? * gst-plugins-good configuration? </blockquote><div> Since it's the 2.6.32 kernel, you obviously have the latest webcam driver (either gspca or uvcvideo) as well. The only other thing that might me older is the libv4l library. Try updating the libv4l library with "opkg update libv4l" . The latest version I think is libv4l_0.6 . Thanks, Raseel</div></div>