What I may doubt is the way frame rate conversion is done between TRUE NTSC and PAL. I believe that the interlace processing is correct. Then, the fields will be separated (using separatefields).Īfter all the resizing to DVD standards and adittional processing the fields will be rejoined again (using weave). So, after detecting an interlaced source material, I try to detect the first field (top or bottom) - there are several ways of doing this explained in the forum. If I have a progressive AVI I want to output a progressive MPG/DVD title. If I have an interlaced AVI, I want to output an interlaced MGP/DVD title. So I must say there is around 1% or 2% of interlaced material to be used.Īnyway, I believe these 1% or 2% also deserve to be (tentatively) correctly processed. In fact D2mp pretends to author Dvds using Avis. (for DVD to DVD format conversion there are other tools available). In fact, looking at the way I've wrote my previous message it sounds awful.Įven being out of the initially planned scope for this thread, let me try to explain better with my limited English:įor the proposes of d2mp program I've found that interlaced material will only be found when converting camcorder material or some DVD-recorder TV captured material. The 2nd step is to remove these duplicated video frames and so recovering the original 23.976 fps – a process usually called Inverse TELECINE or IVTC.

This analysis can be done by means of an avisynth script which scans the frame differences in a video stream and generates a log file that can then be analyzed. The 1st step is to detect if in each group of 5 there is a duplicated frame, and which is the duplicated one. These sources came from original 23.976 fps material usually converted to 29.97 fps repeating 1 video frame (or 2 half-frames) in each group of 5 video frames (there are other FILM-NTSC convertion techniques but I will only consider this one). NTSC 29.97 sources can be (what I call) “pure” NTSC – with really 29.97 frames per second - or they can be previously originally captured at 23.976 fps and converted to 29.97 – what usually happens to material converted from cinema movies (FILM) – by a process usually called TELECINE.

Pal to ntsc dvd editor