I know it has been a while however..., wherever I found it, I think at
https://sourceforge.net/projects/smplay ... yer/21.8.0
SMPlayer-21.8.0-x86_64.AppImage meets most of the needs of my remote IP cam on Fossapup64. This is a full featured Multimedia browser and BIG. It uses almost the same resources as MPV on my machine and I am fairly well impressed so far.
My camera records in .264, not H264 but the generic version. Live feed gives me great sound though the recorded video on the camera's remote storage SD card seems to play no sound. (Still looking into that.)
I have tried many multimedia players and this one can at least play video at real time / speed from the card in my SV3C camera in great quality. Just wanted to mention the Appimage for folks who might have problems with playing things in real time speed. It also has a youtube browser that works out of the box. It is a big file, 129MB but I run it from a storage partition and I have plenty of room right now