#### Command Line

    player [-ao null] [-vo qt|gl|d2d|gdi|xv] [-vd "dxva[;cuda[;vaapi[;vda[;ffmpeg]]]]"] [--ffmpeg-log] [-f url|path|pipe:]

To disable audio output, add `-ao null```

Choose a render engine with -vo option(default is OpenGL). For example, in windows that support Direct2D, you can run

    player -vo d2d filename

To select decoder, use `-vd` option. Value can be dxva, cuda, vaapi and `ffmpeg`, or a list separated by ; in priority order. For example:

    player -vd "dxva;cuda;ffmpeg" filename

will use dxva if dxva can decode, use cuda if dxva failed to decode, and use ffmpeg if cuda can not decode.

#### Shortcuts

- Double click: fullscreen switch
- Ctrl+O: open a file
- Space: pause/continue
- A: aspect ratio
- F: fullscreen on/off
- T: stays on top on/off
- N: show next frame. Continue the playing by pressing "Space"
- O: OSD
- P: replay
- Q/ESC: quit
- S: stop
- R: rotate 90
- M: mute on/off
- Up / Down: volume + / -
- Ctrl+Up/Down: speed + / -
- -> / <-: seek forward / backward
- Ctrl+Wheel: zoom in/out
- Drag and drop a media file to player

read wiki for more information: https://github.com/wang-bin/QtAV/wiki/_pages