I have an android app. When I upload a gif and transform to mp4 video, then everything is okay, and it is working everywhere. When I upload mp4 video from other website, then app does not play it on some phones. I guess it's because of that video's original format or codec or something. So how can I transform this video like when I upload a gif file? I tried different formats, but it didn't help. I don't need audio I only need video.
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