CinelerraGG git checkin includes the following upgrades and a couple of fixes:

1) fixed ffmpeg scan remap

2) BT 473 configure.ac patch (noted by ferdnyc with patch)

3) thirdparty libraries updated to include:

ffmpeg from 4.1 to 4.3

turbo-jpeg

vorbis

x265

vpx

lv2

aom

dav1d

nv-codec-headers

No thorough test has been done so just using it helps to make sure there are no problems.  Thank you, GG/Phyllis