Add setting for custom options for mpv

[dharmik2319]

Is your feature request related to a problem? Please describe.
Recently, when starting an h264 8-bit video on my AMD iGPU with mpv, I faced a black screen with only subtitles and audio. See mpv-player/mpv#3714. I noticed that i faced the same problem with Jellyfin Media Player as well and was getting the same error message. I was able to solve the mpv issue by commenting out the mpv.conf file, which had just one line: hwdec=vaapi. Another workaround was using --no-config in the cli.

I copied the mpv.conf file to the directory containing jellyfinmediaplayer.conf but the problem persisted and the mpv.conf file was getting overridden.

Describe the solution you'd like
Give the user an option for custom mpv options, or even better, an option to select another player.

Describe alternatives you've considered
As stated before, the mpv.conf got overridden

[kradear]

mpv.conf ignores most if not all commands I use on MPV for JMP.

I've read of users being able to use settings as sub-pos or volume-max to modify JMP, but it's current version doesn't seem to take any them.

I've looked around but found no way of setting these or adding/modifying input settings for JMP. The keyboard.json options don't seem to take effect if not using the "TV mode" of JMP.

I couldn't find talks about adding these features to the app, but it would a first step on replacing external players for good.
Being able to use mpv.conf and input.conf on JMP would open full customization.

[satmandu]

The mpv.conf settings appear to be read here:

jellyfin-media-player/src/player/PlayerComponent.cpp

Line 90 in bc0ec5a

// Configuration properties defined in the mpv.conf will override our

  // Configuration properties defined in the mpv.conf will override our
  // hardcoded properties below.
  mpv::qt::set_property(m_mpv, "config", "yes");
  mpv::qt::set_property(m_mpv, "config-dir", Paths::dataDir());

If that's not working, maybe you could try some debug code to make sure the right dir for the mpv.conf file is being used?

[sevenrats]

this functionality works. some items like subposition and size are overruled by client settings. that discussion is happening here:
#474

[sevenrats]

#543