Ffmpeg-python: There is no possibility to set the same command line argument more than one time

[akustovbanuba]

For example I couldn't call ffmpeg this way:
ffmpeg -i INPUT -map_channel 0.0.1 -map_channel 0.0.0 OUTPUT
As the result there is no way to configure _map_channel_.

[xiaclo]

Yeah there is, but it's hacky.

class DuplicateString(str):
    def __hash__(self):
        return hash(str(id(self)))

ffmpeg.input(INPUT).output(OUTPUT, **{
    DuplicateString('map_channel'): '0.0.1',
    DuplicateString('map_channel'): '0.0.0',
})

I agree there should be a better way, but python has workarounds for everything.