Flawless speed change

[ghost]

For a custom project I need to play audio files (nice to have also for video ones) changing at run-time the playing speed. A quick test with keys 1 and 2 reveals that it works for both but with two main drawbacks:

1. the change range is very limited: I would need something about from about 30% to at least 200%. If I'm correct the constraints are set here. Do you think I can change them or they are already set to the maximum allowable range?

2. most important thing: no gap should be hear when the speed is changed. It should be smooth and flawless. Currently, pressing 1 or 2 leads to a quite long gap. Any idea how to avoid it?

[vectorstudio]

Try to use omxplayer-wrapper.
https://python-omxplayer-wrapper.readthedocs.io/en/latest/

player.set_rate(*)
this can change speed as you wish