Why is this Avisynth script giving me wrong ordered fields?

[brassplyer]

Deinterlacing and going from DV to HuffYuv with this script

SetMemoryMax(768)
SetMTMode(3, 4)
FFMpegSource2("sourcevideo.avi", atrack=-1)
ConverttoYv12(interlaced=true)
SetMtMode(2)
QTGMC (Preset="fast")
RemoveGrain (mode=17)
crop (8,0,-8,-8)

Seems to result in backwards fields - i.e. when you view frame by frame with Virtualdub you get the forward/back motion.

Any suggestions?

Thanks.

[manono]

Stick in an 'AssumeTFF()' or 'AssumeBFF()' after the FFMPEGSource2 line, whichever fixes it.

[sanlyn]

Deinterlacing and going from DV to HuffYuv with this script

SetMemoryMax(768)
SetMTMode(3, 4)
FFMpegSource2("sourcevideo.avi", atrack=-1)
ConverttoYv12(interlaced=true)
SetMtMode(2)
QTGMC (Preset="fast")
RemoveGrain (mode=17)
crop (8,0,-8,-8)

Seems to result in backwards fields - i.e. when you view frame by frame with Virtualdub you get the forward/back motion.

Any suggestions?

Thanks.

Isn't DV already YV12?

DV is usually BFF.

[brassplyer]

Stick in an 'AssumeTFF()' or 'AssumeBFF()' after the FFMPEGSource2 line, whichever fixes it.

Thanks, AssumeTFF does the trick.

I thought it's standard for the fields to be bottom field first?

[brassplyer]

Deinterlacing and going from DV to HuffYuv with this script

SetMemoryMax(768)
SetMTMode(3, 4)
FFMpegSource2("sourcevideo.avi", atrack=-1)
ConverttoYv12(interlaced=true)
SetMtMode(2)
QTGMC (Preset="fast")
RemoveGrain (mode=17)
crop (8,0,-8,-8)

Seems to result in backwards fields - i.e. when you view frame by frame with Virtualdub you get the forward/back motion.

Any suggestions?

Thanks.

Isn't DV already YV12?

I think it's the remove grain that requires the conversion to YV12. Without it you get a message about masktools only working with planar color spaces.

DV is usually BFF.

That's what i thought but the AssumeTFF works here...??

[sanlyn]

Th "DV" format is BFF, YV12. I see you are opening an "AVI". What encoder was used on the video inside the "AVI"? Is it DivX? XVid? Apparently you refer to an "AVI" with a losslessly compressed RGB or YUY2 video file inside of it, because those are the only two colorspaces that can be used with huffyuv compression. So there's no way you could go from "DV" to "huffyuv". Your original source might have been an AVI container, but it sure didn't have "DV" inside of it.

[jagabo]

Isn't DV already YV12?

NTSC DV is internally YUV 4:1:1. What comes of the decoder depends on what the decoder and editor negotiate. In most cases it will be YUY2. Some decoders only output RGB (Panasonic DV Codec <-- never use this codec). PAL DV is internally YUV 4:2:0 and usually comes out as interlaced YV12.

[sanlyn]

Ah .The matter is clarified.