feature request: Add an option to stream only if transcoding isn't needed

[sin3point14]

Checklist

• [X] I checked that this feature has not been requested before
• [X] I checked that this feature is not in the "Not planned" list
• [ ] This feature will benefit the majority of users

Problem Description / Use Case

I have a NAS that has a super old CPU(pentium 4). I am hosting seanime on it. The machine is good enough to serve multiple web servers but nowhere close to handling transcoding. I tried playing with the Media streaming settings and I see that if codec isn't supported by the browser, it starts to transcode, killing my poor CPU.

Proposed Solution

Judging by the logs seanime can already detect the need to transcode. So can we add a button to the Media streaming page called Enable transcoding. Turning off would disable transcoding entirely and maybe inform the user to use an external player. Hopefully it shouldn't be too hard to implement and if you accept contributions I can also try implementing this?

Additionally(I don't know if this is even posssible but...) Can we add an option to filter to filter the torrents by the file types? Streaming with mkv seems to be a problem so I can then filter mp4 torrents. Looking at https://animetosho.org/view/erai-raws-kami-no-tou-ouji-kikan-01.n1842682 the File Name (Size) section seems to indicate the extension: .mkv.