Play pause button on gmplay

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Well cuz it's literally playing videos in don't have any sorts of logs.

Well im using geek master's videoplayer for playing videos.
The first problem that im encountering is that the video i convert from https://xn--1xap.com/gmvgz/ all of them have a problem in showing(reference to the attachment, there is a video) like no matter the resolution or video.

And the second thing I mean has anyone has any idea on how do I make a player doesn't matter if it's kual or koreader or pure compiled c but like after playing the video I get to pause it atleast. Or even forcefully close it(not let the video end on it's on or set a timer for it).

I'm going to attach gmplay file which im using and video too, if anyone wanna try(it's on resolution 1072x1448)

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Command to play:"bash gmplayer.sh sample1.gmv.gz"