force film vs inverse telecining

[wcb4]

You know, I have been wondering something for some time and I was hoping that someone on this board would know the answer. When converting dvd to vcd, I often see that its a film type but 29.97 fps. I know that this measn that there are extra frames in there that really are not needed and I can do an inverse telecine in TMPGenc to decimate it back to the 24fps film standard, but there is also an option in dvd2avi to "force film".

I have done this both ways (not as a comparison on the same movie). I accidentally clicked on force film once and the resulting project was encoded at 24 flm (NTSCFilm template) and looked fine. I have also done an inverse telecine and they also looked fine.

Are there any advantages/drawbacks to either method? Since I need to use DVD2AVI regardless, using the force film would save the time of doing the inverse telecine in TMPGenc, and I have not seen any problem doing it either way, but was wondering if there might be some problem that I am not seeing, but could occur.

[sommersby]

I always leave force film on, in ripping well over 200 dvd's I have had one, The Kid, that gave me a problem and I had to use inverse telecining.

[adam]

Most dvds are stored in their original 24 fps and use a flag to tell the dvd player to telecine it in real time. The way force film works is that it enables you to to encode the original 24fps video, essentially bypassing the IVTC process.

You should always use force film if possible. Its faster and more reliable than an IVTC. But if the film is not stored in its original 24fps on the dvd than force film is not possible.

Here is what you do. Load your film in dvd2avi and preview it. Let it get past the opening logos and into the movie. If it says %95 or higher film and stays steady then force film will work. If not then you will have to disable force film and either IVTC or encode it interlaced.