Add options to set liveviewsize and/or camera output for better resolution

[theonejrm]

Hi there,

first I have to thank you a lot for building this awesome peace of software. I was struggling getting my Canon M50 into OBS. I tried several ways, but your plugin is the best solution so far!

That said, I'd like to make a wish... Would it be possible to add the settings for liveviewsize and (camera) output? These settings are needed to get the video resolution to about 720p. Otherwise gphoto always seem to use the settings "camera output"=MOBILE2 (instead of PC) and liveviewsize=Small (instead of Large).

So by default I only get a resolution of 512x288, and that's not very satisfying.

Just to be mentioned, I tried gphoto2 directly piping to v4l2 via ffmpeg but it seemed that gphoto2 couldn't save the options of liveviewsize etc. But somehow in entangle it works awesomely well although both use the same library... But entangle isn't a good option to work with obs.

Thank you very much in advance!