QTGMC + miniDV (NTSC) = CHROMA error

[rgr]

I have a MiniDV tape ripped to avi (NTSC!):

Video
ID                             : 0
Format                         : DV
Codec ID                       : dvsd
Codec ID/Hint                  : Sony
Duration                       : 1 h 33 min
Bit rate mode                  : Constant
Bit rate                       : 24.4 Mb/s
Width                          : 720 pixels
Height                         : 480 pixels
Display aspect ratio           : 4:3
Frame rate mode                : Constant
Frame rate                     : 29.970 (30000/1001) FPS
Original frame rate            : 29.970 (29970/1000) FPS
Standard                       : NTSC
Color space                    : YUV
Chroma subsampling             : 4:1:1
Bit depth                      : 8 bits
Scan type                      : Interlaced
Scan order                     : Bottom Field First
Compression mode               : Lossy
Bits/(Pixel*Frame)             : 2.357

When I try to open this file via Avisynth:

ffms2("2.avi",atrack=-1)
QTGMC(preset="slow")

I get this error:
[avisynth @ 000001d4f581e340] MDegrain1 : no valid OVERSCHROMA function for 16x16, bitsperpixel=8, lsb_flag=0, level=1
(C:/Program Files (x86)/AviSynth+/plugins64+/QTGMC.avsi, line 879)
(2.avi.avs, line 2)

(@ preset ="slower")
Avisynth open failure: MVTools: no BLITCHROMA function for block size 4x16 (C:/Program Files (x86)/AviSynth+/plugins64+/QTGMC.aysi, line 642)


Why?

[poisondeathray]

Might be mvtools2 not supporting 4:1:1, it' s not listed
https://github.com/pinterf/mvtools

Supporting YUY2, 4:2:0, 4:2:2, 4:4:4 at native 8, 10, 12, 14 and 16 bit depths, 32bit float in selected filters.

You can use ConvertToYV16(interlaced=true) after the source filter for planar 4:2:2

[rgr]

Thanks.
Does the chromaresample value have any significant effect?

[poisondeathray]

Does the chromaresample value have any significant effect?

Did you mean this parameter ?
http://avisynth.nl/index.php/Convert#Chroma_resample

It's the algorithm used to resample the chroma

It probably won't be that significant for a NTSC DV source , but it depends on what you are doing exactly

There are times when you might want "blocky" chroma, and use "nearest neighbor" to up and downsample . For general use the bicubic is probably a good choice. For sharper chroma, you might want lanczos, but it predisposes to chroma ringing artifacts because it's sharper