[FranceBB]

It works as expected.
By the way, you wrote to use avsresize to convert to RGB 16bit, but you can convert without using it like so:

video3=DGDecode_MPEG2Source("I:\Production\RAW\424-430\427.d2v")
audio3=FFAudioSource("I:\Production\RAW\424-430\427 T81 2_0ch 224Kbps DELAY -134ms.ac3")
AudioDub(video3, audio3)

tfm(mode=1,pp=5,slow=2,micmatching=2,clip2=tdeint(mode=2,type=3)) 
tdecimate()
ConvertFPS(23.976)

trim(0, 500)

Crop(4, 0, -4, -0)

Spline64Resize(848, 480)

ConvertBits(16)

ConvertToPlanarRGB()

Cube("BT601_to_BT709.cube")

Converttoyuv420()

I tested it with a simple BT601 to BT709.
I don't really do BT601 to BT709 conversion using a LUT 'cause I generally use ColorMatrix for 8bit and Dither_Tools for 16bit, but in order to test your new plugin, I did and it was fine.

Thank you very much indeed.