Hi Aleina,
I cannot reproduce freezing with your sample video yet. I ticked the "Reverse playback" option and "Mute" option.
Can you give me step by step instuction how to see this freezing?
However I know the issue with Reverse playback option with video files in MTS file container (raw video stream).
P.S. Please note that reverse video playback is usually not smooth enough - such playback requires a lot of computation, because video files are not optimized for reverse decoding. We hope to optimize it as possible.