Allow downloading of ffmpeg/ffprobe if no acceptable executables on path

[4c0d3r]

This downloads ffmpeg/ffprobe if no acceptable ffmpeg/ffprobe is on the path. By default the download is in the same dir as the executable, but may be overridden with the new command line flag.

[4c0d3r]

I install ffmpeg even if the command isn't fully provided args to allow namer to leverage video hashes to install ffmpeg as well.

[gedw99]

works on mac intel perfectly :)
I dont have a mac arm64 to test on.

[4c0d3r]

This has shipped with namer for a while. All Amd64 oses are tested in namer's GitHub actions build. Arm64 likely been tested by someone by now, arm linux, couldn't say.....

[gedw99]

so we can get full testing on all is and chip isa, we could use this approach.

Here’s one of my generic GitHub ci scripts: https://github.com/gedw99/sc-make/blob/main/.github/workflows/ci.yaml

it will cross build and test or anything you want because all it does is call the make file!

makefiles work on windows and Mac and Linux

Here is the make targets: https://github.com/gedw99/sc-make/blob/main/makefile#L17