Glithes on the preview and in the destination file

[kingcrimsonster]

Lowering MT-Threads to 1 seems to somehow fix it, at least partially. Enabling 'Disable MT' does fix it here.

I would recommend:
a. enable 'Disable MT' for this source,

How much can slow down processing by enabling this option?

If ColorMatrix and resizing with point resizer is the only thing, it might even be faster. (I don't really expect any slow down with just these filters, but simply try it.)

Format : MPEG-4
Format profile : Base Media
File size : 5.83 GiB
Format/Info : Advanced Video Codec
Format profile : Main@L5.1
Format settings : CABAC / 3 Ref Frames
Format settings, Reference frames : 3 frames
Codec ID : avc1
Codec ID/Info : Advanced Video Coding
Duration : 45 min 53 s
Bit rate mode : Variable
Bit rate : 18.0 Mb/s
Width : 3 840 pixels
Height : 2 160 pixels


Resize to 1080p
Filters:
Levels
AutoAdjust
ColorMatrix Rec2020 - Rec709

Encoder NVEncs h264

With 'Disable MT'
Encoding time - 13 hours

With Disable ColorMatrix
Unchecked 'Disable MT'
Set MT-Threads "0"

Encoding time - 2 hours