ffmpeg -devices

1. ffmpeg -devices -loglevel quiet

显示ffmpeg支持的设备，通常用于查看ffmpeg支持的硬件设备，比如Cuda、Atalas

2. 输出

Devices: D. = Demuxing supported .E = Muxing supported

DE alsa ALSA audio output

E caca caca (color ASCII art) output device

DE fbdev Linux framebuffer

D iec61883 libiec61883 (new DV1394) A/V input device

D jack JACK Audio Connection Kit

D kmsgrab KMS screen capture

D lavfi Libavfilter virtual input device

D libcdio

D libdc1394 dc1394 v.2 A/V grab

D openal OpenAL audio capture device

E opengl OpenGL output

DE oss OSS (Open Sound System) playback

DE pulse Pulse audio output

E sdl,sdl2 SDL2 output device

DE sndio sndio audio playback

DE video4linux2,v4l2 Video4Linux2 output device

D x11grab X11 screen capture, using XCB

E xv XV (XVideo) output device

3. 说明

输出选项中带D，表示支持该格式的解码；带E，表示支持该格式的编码。