如何知道摄像头输出什么格式的数据，bmp、jpeg还是rgb或者yuv格式

[Do_Change_Lyd]

请问如何知道摄像头输出什么格式的数据，是bmp或者jpeg还是rgb或者yuv格式，因为要知道摄像头输出数据的格式，才能确定是不是要进行格式转换，我使用H.264编码库对yuv格式数据进行编码然后传输

[Do_Change_Lyd]

我的摄像头输出的是jpeg格式的数据，需要先用libjpeg库解码，得到RGB24格式的数据，然后将它转换成yuv420格式的，再对其进行编码传送。你有做过这个吗。你的QQ多少，想和你讨论一下，可以么？

[falloutmx]

这个跟摄像头有关，YUV/RGB都有，也有两种都支持的。如果是YUV也会有区别，有些是YUV420有些是YUV422。

[nuclears]

现在的摄像头基本都是支持V4L2的。 通过V4L2的接口可以获得当前摄像头驱动所支持的所有数据格式以及分辨率等信息。 或者将摄像头插到Linux机器上，直接使用命令luvcview获得当前摄像头所支持的所有数据格式以及分辨率信息： luvcview -L

[nuclears]

下面这个是我的Logitech C270摄像头的输出信息： #luvcview -L luvcview 0.2.6 SDL information: Video driver: x11 A window manager is available Device information: Device path: /dev/video0 { pixelformat = 'YUYV', description = 'YUV 4:2:2 (YUYV)' } { discrete: width = 640, height = 480 } Time interval between frame: 1/30, 1/25, 1/20, 1/15, 1/10, 1/5, { discrete: width = 160, height = 120 } Time interval between frame: 1/30, 1/25, 1/20, 1/15, 1/10, 1/5, { discrete: width = 176, height = 144 } Time interval between frame: 1/30, 1/25, 1/20, 1/15, 1/10, 1/5, { discrete: width = 320, height = 176 } Time interval between frame: 1/30, 1/25, 1/20, 1/15, 1/10, 1/5, { discrete: width = 320, height = 240 } Time interval between frame: 1/30, 1/25, 1/20, 1/15, 1/10, 1/5, { discrete: width = 352, height = 288 } Time interval between frame: 1/30, 1/25, 1/20, 1/15, 1/10, 1/5, { discrete: width = 432, height = 240 } Time interval between frame: 1/30, 1/25, 1/20, 1/15, 1/10, 1/5, { discrete: width = 544, height = 288 } Time interval between frame: 1/30, 1/25, 1/20, 1/15, 1/10, 1/5, { discrete: width = 640, height = 360 } Time interval between frame: 1/30, 1/25, 1/20, 1/15, 1/10, 1/5, { discrete: width = 752, height = 416 } Time interval between frame: 1/25, 1/20, 1/15, 1/10, 1/5, { discrete: width = 800, height = 448 } Time interval between frame: 1/25, 1/20, 1/15, 1/10, 1/5, { discrete: width = 800, height = 600 } Time interval between frame: 1/20, 1/15, 1/10, 1/5, { discrete: width = 864, height = 480 } Time interval between frame: 1/20, 1/15, 1/10, 1/5, { discrete: width = 960, height = 544 } Time interval between frame: 1/15, 1/10, 1/5, { discrete: width = 960, height = 720 } Time interval between frame: 1/10, 1/5, { discrete: width = 1024, height = 576 } Time interval between frame: 1/10, 1/5, { discrete: width = 1184, height = 656 } Time interval between frame: 1/10, 1/5, { discrete: width = 1280, height = 720 } Time interval between frame: 1/10, 1/5, { discrete: width = 1280, height = 960 } Time interval between frame: 2/15, 1/5, { pixelformat = 'MJPG', description = 'MJPEG' } { discrete: width = 640, height = 480 } Time interval between frame: 1/30, 1/25, 1/20, 1/15, 1/10, 1/5, { discrete: width = 160, height = 120 } Time interval between frame: 1/30, 1/25, 1/20, 1/15, 1/10, 1/5, { discrete: width = 176, height = 144 } Time interval between frame: 1/30, 1/25, 1/20, 1/15, 1/10, 1/5, { discrete: width = 320, height = 176 } Time interval between frame: 1/30, 1/25, 1/20, 1/15, 1/10, 1/5, { discrete: width = 320, height = 240 } Time interval between frame: 1/30, 1/25, 1/20, 1/15, 1/10, 1/5, { discrete: width = 352, height = 288 } Time interval between frame: 1/30, 1/25, 1/20, 1/15, 1/10, 1/5, { discrete: width = 432, height = 240 } Time interval between frame: 1/30, 1/25, 1/20, 1/15, 1/10, 1/5, { discrete: width = 544, height = 288 } Time interval between frame: 1/30, 1/25, 1/20, 1/15, 1/10, 1/5, { discrete: width = 640, height = 360 } Time interval between frame: 1/30, 1/25, 1/20, 1/15, 1/10, 1/5, { discrete: width = 752, height = 416 } Time interval between frame: 1/30, 1/25, 1/20, 1/15, 1/10, 1/5, { discrete: width = 800, height = 448 } Time interval between frame: 1/30, 1/25, 1/20, 1/15, 1/10, 1/5, { discrete: width = 800, height = 600 } Time interval between frame: 1/30, 1/25, 1/20, 1/15, 1/10, 1/5, { discrete: width = 864, height = 480 } Time interval between frame: 1/30, 1/25, 1/20, 1/15, 1/10, 1/5, { discrete: width = 960, height = 544 } Time interval between frame: 1/30, 1/25, 1/20, 1/15, 1/10, 1/5, { discrete: width = 960, height = 720 } Time interval between frame: 1/30, 1/25, 1/20, 1/15, 1/10, 1/5, { discrete: width = 1024, height = 576 } Time interval between frame: 1/30, 1/25, 1/20, 1/15, 1/10, 1/5, { discrete: width = 1184, height = 656 } Time interval between frame: 1/30, 1/25, 1/20, 1/15, 1/10, 1/5, { discrete: width = 1280, height = 720 } Time interval between frame: 1/30, 1/25, 1/20, 1/15, 1/10, 1/5, 剩下的不贴了，超过字数限制了。

[Do_Change_Lyd]

我使用下面程序检查摄像头是否支持 rgb240格式 的数据，为什么没反应的？ //检查是否支持某种帧格式 struct v4l2_format fmt; fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE; fmt.fmt.pix.pixelformat = V4L2_PIX_FMT_RGB24; if( ioctl( vd->fd, VIDIOC_TRY_FMT, &fmt) == -1 ) if( errno == EINVAL ) printf(" Not support format RGB24!\n"); else printf("support format RGB24 !\n");