Quicktime not playing mp4

Hello,

I have a problem with Quicktime that it won't play sometimes videos. The videos formats are .mp4 and .mov codeced by h264 mpeg-4 avc / h265.

The videos are from a security cameras so it's not reccording audio (to save storage on the servers).

I had to install MKPlayer to resolve this, Although it's playing just fine with MKPlayer, MKPlayer doesn't support fast playing as Quicktime does, which I need for my work purposes.

I have to mention that my co-workers are dealing with the same problem running .mp4 / .mov videos with h264 & h265 codecs on their Iphones (11 & 13, ios - 16.2). when they're trying to watch a video via Whatsapp / Telegram it opens a white screen and won't play the video at all.

If there's any fix for it (for my macbook, and my co-workers Iphones), it would be wonderful.

edit:

I attached a screenshots to show the video details as appear with "get file info" for an example.

QuickTime does play this video.

Quicktime doesn't play those: