"So i have no idea what is precisely the issue, but just copying everything as is in another container with ffmpeg in like 5 seconds seemed to fix the thing."
ffmpeg can be stripping certain things when copying (-c copy) streams, for example i know for a fact unless told not to it strips dolby vision metadata
for an actual fact based comparison get a mediainfo output before and after
in some cases as well the container format may dictate which video and audio codecs are supported on a client
ffmpeg can be stripping certain things when copying (-c copy) streams, for example i know for a fact unless told not to it strips dolby vision metadata
for an actual fact based comparison get a mediainfo output before and after
in some cases as well the container format may dictate which video and audio codecs are supported on a client