mini2440 MJPG_STREAMER 产生问题

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usb摄像头芯片是中芯微的zc0301pl，
http://www.vimicro.com.cn/product/pdf/ZC301PL-1107-V10-EN.pdf

[root@FriendlyARM bin-song]# usb 1-1.2: new full speed USB device using s3c2410-ohci and address 10  
usb 1-1.2: New USB device found, idVendor=0ac8, idProduct=301b  
usb 1-1.2: New USB device strings: Mfr=1, Product=2, SerialNumber=0  
usb 1-1.2: Product: PC Camera  
usb 1-1.2: Manufacturer: Vimicro Corp.  
usb 1-1.2: configuration #1 chosen from 1 choice  
gspca: probing 0ac8:301b  
zc3xx: probe 2wr ov vga 0x0000  
zc3xx: probe sensor -> 0011  
zc3xx: Find Sensor HV7131R(c)  
gspca: probe ok

/************************************************************************************************************************************/
执行,,如下---使用google code上的mjpg-streamer for mini2440，如前面4篇

FriendlyARM bin13]# ./start_uvc.sh   
MJPG Streamer Version.: 2.0  
 DBG(input_uvc.c, input_init(), 133): argv[0]=UVC webcam grabber  
 i: Using V4L2 device.: /dev/video0  
 i: Desired Resolution: 640 x 480  
 i: Frames Per Second.: 5  
 i: Format............: MJPG  
 requested MJPG but got JPEG format instead//格式
 DBG(dynctrl.c, initDynCtrls(), 139): adding control for 0  
 DBG(dynctrl.c, initDynCtrls(), 143): uvcioc ctrl add error: errno=22 (retval=-1)  
 DBG(dynctrl.c, initDynCtrls(), 139): adding control for 1  
...

if(vd->fmt.fmt.pix.pixelformat!=vd->formatIn)  
{  
char fourcc1[5]={0,0,0,0,0};  
char fourcc2[5]={0,0,0,0,0};  
    memmove(fourcc1,(char*)&vd->formatIn,4);  
    memmove(fourcc2,(char*)&vd->fmt.fmt.pix.pixelformat,4);  
    fprintf(stderr, " requested %s but got %s format instead\n",fourcc1,fourcc2);  
   vd->formatIn = vd->fmt.fmt.pix.pixelformat;  
}

将这个if块注释掉就正常啦。。。
秀一张很模糊很美的图片----是摄像头差劲，10元一个。

/************************************************************************************************************************************/
如果使用友善提供的编译好的程序，考到板子上执行会有如下问题

[root@FriendlyARM /mjpg-streamer]# ./start_uvc.sh   
MJPG Streamer Version.: 2.0  
 i: Using V4L2 device.: /dev/video0  
 i: Desired Resolution: 640 x 480  
 i: Frames Per Second.: 5  
 i: Format............: MJPEG  
 Pixel format is unavailable, using JPEG   
 should never arrive exit fatal !!  
 i: init_VideoIn failed  

[root@FriendlyARM /mjpg-streamer]# ./start_uvc_yuv.sh   
MJPG Streamer Version.: 2.0  
 i: Using V4L2 device.: /dev/video0  
 i: Desired Resolution: 640 x 480  
 i: Frames Per Second.: 5  
 i: Format............: YUV  
 i: JPEG Quality......: 80  
 Pixel format is unavailable, using JPEG   
 should never arrive exit fatal !!  
 i: init_VideoIn failed

[root@FriendlyARM plg]# ./mjpg_streamer  -i "./input_uvc.so" -o "./output_http.so -w /mjpg-streamer/www/"
MJPG Streamer Version.: 2.0  
 i: Using V4L2 device.: /dev/video0  
 i: Desired Resolution: 640 x 480  
 i: Frames Per Second.: 5  
 i: Format............: MJPEG  
 o: www-folder-path...: /mjpg-streamer/www/  
 o: HTTP TCP port.....: 8080  
 o: username:password.: disabled  
 o: commands..........: enabled  
zc3xx: probe 2wr ov vga 0x0000

[root@FriendlyARM plg]# ./uvc_stream   
Using V4L2 device.....: /dev/video0  
Resolution............: 640 x 480  
frames per second.....: 5  
TCP port..............: 8080  
motor control TCP port: 8081  
zc3xx: probe 2wr ov vga 0x0000

把input_cmoscamera.so借来，使用mjpg-streamer测试cmos摄像头了，正常。

[root@FriendlyARM plg]# ./mjpg_streamer  -i "./input_cmoscamera.so" -o "./output_http.so -w /mjpg-streamer/www/"
MJPG Streamer Version.: 2.0  
 i: Using CMOS Camera device.: /dev/camera  
 i: Desired Resolution: 640 x 512  
 i: Frames Per Second.: 5  
 i: Format............: YUV  
 i: JPEG Quality......: 80  
 o: www-folder-path...: /mjpg-streamer/www/  
 o: HTTP TCP port.....: 8080  
 o: username:password.: disabled  
 o: commands..........: enabled

由于天嵌提供的这方面的资料全一些，所以后面就分析天嵌的WebCam了。

mini2440 MJPG_STREAMER 产生问题

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原文地址：http://www.cnblogs.com/aibowen/p/4586771.html