You can simulate the behaviour of ffplay with ffmpeg by using the xv output device like so.
ffmpeg -re -f lavfi -i 'color=red [red]; color=blue [blue]; [blue][red]xfade=duration=5s, format=yuv420p, trim=duration=5s' -f xv ''
This has certain uses since ffmpeg can do more things than ffplay – for example it can take multiple inputs. The -re command ensure that playback is at normal speeds.
However to use this you have to use a lavfi input source rather a complex filter because if you use -filter_complex ffmpeg will process as quickly as possible causing X11 to use 100% cpu and the video to play too quickly. See the example below
ffmpeg -re -f lavfi -i 'color=red [red]; color=blue [blue]; [blue][red]xfade=duration=5s, format=yuv420p, trim=duration=5s' -f xv ''
Is there any way of controlling either the “speed” of source filters, or the “write speed” of outputs.
