FFmpeg操作电脑摄像头实验

最近在学习音视频相关知识，参考雷神（leixiaohua1020）的博客做了一些小实验，记录备忘。

一、记录几条命令

1、列出电脑支持的音视频设备

ffmpeg -list_devices true -f dshow -i dummy

输出如下（节选了关键内容）：

[dshow @ 0000025feeb5d840] DirectShow video devices (some may be both video and audio devices)
[dshow @ 0000025feeb5d840]  "Integrated Camera"
[dshow @ 0000025feeb5d840]  "OBS Virtual Camera"

[dshow @ 0000025feeb5d840] DirectShow audio devices
[dshow @ 0000025feeb5d840]  "麦克风 (Realtek(R) Audio)"

2、列出设备选项

其中，video后的名字是通过list_devices获取到的

ffmpeg -list_options true -f dshow -i video="Integrated Camera"

输入如下：

[dshow @ 0000019bb535d800] DirectShow video device options (from video devices)
[dshow @ 0000019bb535d800]  Pin "捕获" (alternative pin name "捕获")
[dshow @ 0000019bb535d800]   pixel_format=yuyv422  min s=1280x720 fps=30 max s=1280x720 fps=30
[dshow @ 0000019bb535d800]   pixel_format=bgr24  min s=1280x720 fps=30 max s=1280x720 fps=30
[dshow @ 0000019bb535d800]   pixel_format=yuyv422  min s=320x180 fps=30 max s=320x180 fps=30
[dshow @ 0000019bb535d800]   pixel_format=bgr24  min s=320x180 fps=30 max s=320x180 fps=30
[dshow @ 0000019bb535d800]   pixel_format=yuyv422  min s=320x240 fps=30 max s=320x240 fps=30
[dshow @ 0000019bb535d800]   pixel_format=bgr24  min s=320x240 fps=30 max s=320x240 fps=30
[dshow @ 0000019bb535d800]   pixel_format=yuyv422  min s=352x288 fps=30 max s=352x288 fps=30
[dshow @ 0000019bb535d800]   pixel_format=bgr24  min s=352x288 fps=30 max s=352x288 fps=30
[dshow @ 0000019bb535d800]   pixel_format=yuyv422  min s=424x240 fps=30 max s=424x240 fps=30
[dshow @ 0000019bb535d800]   pixel_format=bgr24  min s=424x240 fps=30 max s=424x240 fps=30
[dshow @ 0000019bb535d800]   pixel_format=yuyv422  min s=640x360 fps=30 max s=640x360 fps=30
[dshow @ 0000019bb535d800]   pixel_format=bgr24  min s=640x360 fps=30 max s=640x360 fps=30
[dshow @ 0000019bb535d800]   pixel_format=yuyv422  min s=640x480 fps=30 max s=640x480 fps=30
[dshow @ 0000019bb535d800]   pixel_format=bgr24  min s=640x480 fps=30 max s=640x480 fps=30
[dshow @ 0000019bb535d800]   pixel_format=yuyv422  min s=848x480 fps=30 max s=848x480 fps=30
[dshow @ 0000019bb535d800]   pixel_format=bgr24  min s=848x480 fps=30 max s=848x480 fps=30
[dshow @ 0000019bb535d800]   pixel_format=yuyv422  min s=960x540 fps=30 max s=960x540 fps=30
[dshow @ 0000019bb535d800]   pixel_format=bgr24  min s=960x540 fps=30 max s=960x540 fps=30

3、使用ffplay播放摄像头数据

ffplay -f dshow -i video="Integrated Camera"

//可以设置分辨率
ffplay -s 1280x720 -f dshow -i video="Integrated Camera"

4、使用FFmpeg保存摄像头视频

ffmpeg -f dshow -i video="Integrated Camera" -vcodec libx264 test.mp4

二、基于VS编码实现

TODO：