Allow to set multipass option for NVENC

[theHamsta]

Description of the feature or enhancement you'd like to see in HandBrake

I would like to set --encopts='multipass=disbaled' or --encopts='multipass=quad' with HandBrakeCLI. This option seems to be correctly set here

HandBrake/libhb/encavcodec.c

Line 356 in 0344426

if (apply_encoder_options(job, context, &av_opts))

, but then overwritten by the default here:

• HandBrake/libhb/encavcodec.c

  Line 375 in 0344426

  av_dict_set( &av_opts, "multipass", "fullres", 0 );

• HandBrake/libhb/encavcodec.c

  Line 465 in 0344426

  av_dict_set( &av_opts, "multipass", "fullres", 0 );

Looking at https://handbrake.fr/docs/en/1.2.0/technical/video-nvenc.html setting multipass doesn't seem to be supported. Would you consider to allow overwriting the default (=fullres) via command line?

What Operating System are you running?

Ubuntu 22.10

What version of HandBrake are you running?

Nightly 0344426

Where did you download HandBrake from?

github

Activity Log, Crash Log or any other details

No response

[sr55]

You can feel free to submit a PR to remove the lines if you wish. No particularly hard feelings either way about it.
Last time I checked, it really didn't make any discernible difference wither it was on or off.

[theHamsta]

Any chances to enable this fix in 1.6.2? Maybe without changing the default, but just allowing to overwrite it via --encopts so it could fit in a bugfix release?

[sr55]

Pushed.