How to transcode automatically

[TheDreadPirate]

So helpful in what you have said, I have gone into client settings and changed a few things, and now things have changed for the better,I still don't understand all of the settings in the JFMP, but that's what the problem was,I wasn't telling it that it couldn't play it so it wasn't doing anything just sending over the original file.

JMP will always attempt to direct play everything, unless configured otherwise.  Either with hardware acceleration, if available, or software (CPU) decoding if no acceleration is available.  If you don't have hardware accelerated decoding in your client's GPU, but you also don't have the computational grunt to decode on the CPU, this can result in a sub-optimal viewing experience.  Like dropped frames.

You have said about AV1 I don't actually have that option ticked in Jellyfin,I have just got Allow Encoding in HEVC format ticked.Is it better to have AV1 ticked?

Thank you so much, it's always a user error lol

This setting only applies if you are transcoding.  If the original codec is AV1, and the client supports it, it doesn't matter what transcode settings you have.  It will just send the AV1 video.

As for whether to check "allow encoding in AV1 format", you can only check that if your server's GPU supports encoding it.  This is limited to Intel Arc dedicated GPUs, Nvidia RTX 4000, and AMD RX 7000 GPUs.