Update lua script for mpv based qc view

[privatezero]

Switches the qc view lua script to use --lafi-complex for filters and fixes issues with audio scopes and signal stats.

This addresses #847 and #782 and can be built upon for ideas in #989.

Note that for Video + Signal view I dropped the stats being displayed at the bottom of the screen to make things cleaner (and I wasn't sure how to access the main vrecord log path variable from within the lua script since it is assigned externally).

[dericed]

@privatezero have you ran this with a live source. When I play from tape I get a half second pause in the player every 4 seconds or so

[privatezero]

@dericed I'm having some issues on my mac mpv build with it not linking to dependencies correctly to enable drawtext so I haven't been able to test out all the views, but in the ones that don't involve drawtext I don't have any pauses with a live source.

Is there a particular view that is triggering that for you, or is it all of them?

[retokromer]

Hello @privatezero
Out of curiosity: what mpv are you using? I am asking, because since a while now we use our own flavour, which is linked to our ffmpeg implementation. If I recall carefully, currently vrecord uses ffmpeg-ma.

[privatezero]

@retokromer it's the one that gets built by brew - there are a few things tangled up on that computer, so I just assume that it isn't linking to ffmpeg-ma for whatever reason. I'll just need to go sort out what is happening over there - I have no similar problems on my Ubuntu machine using standard builds.

[retokromer]

Thank you! (If an AMIA implementation is needed, don't hesitate to get in touch.)

[privatezero]

@dericed for expediency of testing I loaded a different build of MPV (mac ports installation) and retested - I still didn't have any pauses or issues during both live preview and live capture, even while using Audio + Video mode, which should be the most intensive filter graph in there