ffmpeg -f video4linux2 -list_formats all -i /dev/video0
支持格式如下：
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| ffmpeg version N-72043-g17b2630 Copyright (c) 2000-2015 the FFmpeg developers
built with gcc 4.8 (Raspbian 4.8.4-1)
configuration: --enable-gpl --enable-libx264 --enable-nonfree --arch=armel --target-os=linux
libavutil 54. 23.101 / 54. 23.101
libavcodec 56. 38.100 / 56. 38.100
libavformat 56. 32.100 / 56. 32.100
libavdevice 56. 4.100 / 56. 4.100
libavfilter 5. 16.101 / 5. 16.101
libswscale 3. 1.101 / 3. 1.101
libswresample 1. 1.100 / 1. 1.100
libpostproc 53. 3.100 / 53. 3.100
[video4linux2,v4l2 @ 0x1738ff0] Raw : yuyv422 : YUV 4:2:2 (YUYV) : 640x480 160x120 176x144 320x176 320x240 352x288 432x240 544x288 640x360 752x416 800x448 800x600 864x480 960x544 960x720 1024x576 1184x656 1280x720 1280x960
[video4linux2,v4l2 @ 0x1738ff0] Compressed: mjpeg : MJPEG : 640x480 160x120 176x144 320x176 320x240 352x288 432x240 544x288 640x360 752x416 800x448 800x600 864x480 960x544 960x720 1024x576 1184x656 1280x720 1280x960
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