Generate an Audio/Video Sync Test.

Generated stream periodically shows flash video frame and emits beep in audio. Useful to inspect A/V sync issues.

It accepts the following options:

size, s

Set output video size. Default value is hd720.

framerate, fr

Set output video frame rate. Default value is 30.

samplerate, sr

Set output audio sample rate. Default value is 44100.

amplitude, a

Set output audio beep amplitude. Default value is 0.7.

period, p

Set output audio beep period in seconds. Default value is 3.

delay, dl

Set output video flash delay in number of frames. Default value is 0.

cycle, c

Enable cycling of video delays, by default is disabled.

duration, d

Set stream output duration. By default duration is unlimited.

fg, bg, ag

Set foreground/background/additional color.