deinterlace question

[kivuy]

hi if anyone know how to deinterlace 1080i with top field first ?>?

[LoRd_MuldeR]

Maybe start here:
http://avisynth.nl/index.php/Interla..._deinterlacing
http://avisynth.nl/index.php/QTGMC

[richardpl]

QTGMC changes both fields, this is far from optimal solution.

[poisondeathray]

It depends on what your goals are for "deinterlacing"

Originally Posted by richardpl

QTGMC changes both fields, this is far from optimal solution.

QTGMC also has a lossless option that retains the original fields

But if your goal was to reduce bob flicker and aliasing artifacts, then choosing to retain the original fields is far from the optimal solution

[cubicibo]

Originally Posted by richardpl

QTGMC changes both fields, this is far from optimal solution.

Suggest something else then. Sure, you could use "MSU Deinterlacer" or NNEDI3 that leave the input fields untouched but you're in for serious shimmering and flickering on most if not all footages.
At times, it is better to have something pleasing to look at than being just lossless.

[LoRd_MuldeR]

Also, to my understanding, QTGMC has a so-called "lossless" mode, if that is desired:
http://avisynth.nl/index.php/QTGMC#S...h_.2F_Lossless

The additional Lossless modes are designed to take source-match to its logical conclusion: Lossless mode 1 restores the *exact* pixels of the source into the output (provided NoiseRestore=0). This recovers a liitle more source detail but can introduce shimmering, minor combing, noise etc. Note the Sharpness and MatchEnhance settings have little effect in lossless mode 1. Lossless mode 2 makes the clip lossless before the sharpening & final temporal smooth. This removes most of the lossless artefacts and also allows sharpness control. This mode will not give an exactly lossless output but it will gain a little more detail.