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[–] 1 pt

They both work fine here

[–] 0 pt

Thank you for letting me know that. That's really strange that it only pops up the audio player when I click it or load it in another tab directly on catbox and also only allows "Save audio as/Copy audio location" and not "Save video as/Copy video location" as if it were an mp3 file and not an mp4 file.

Your file does play perfectly fine with audio and video locally in VLC player even after choosing "Save audio as" to save it. I've never encountered that before with catbox. I'll look to see if I can see any reason for your file on catbox to not play in-browser for me while my re-converted file does.

Thank you.

[–] 1 pt

You can use Mediainfo (opensource) to check the container and codec of the video that is causing such an issue and compare with the similar one that works.

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Thank you for noting that program. It is very useful.

It looks like it is likely due to it being h265 and my using a Firefox-based browser: https://bugzilla.mozilla.org/show_bug.cgi?id=1332136

"Mozilla currently has no plans to support H.265. Our focus will be on AV1." "We will not support h265 video while its patent encumbered."

I had re-encoded it to h264 as I selected my standard conversion profile and did not notice that it was originally h265. That is why the one I uploaded played fine in-browser and locally for me on Windows and why yours played fine locally for me but not in-browser.

Apparently I've somehow managed to have never encountered an h265 video online while using this browser.