H.264 video stream freezes after loading on Amazon fire tv 4K stick

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There's a H.264 stream that plays fine on my mobile devices running Exoplayer V2.18.0 demo app but video freezes on the Amazon fire stick 4k TV right after loading. If I use Mx Player app to play the stream, it plays fine using HW decoder. Not sure there's some issue with the stream and Mx Player just fixes the issue and lets the stream continue playing. I will send the url of the stream after I have got the issue number. Thanks .