raziel
28th May 2002, 10:57
I have my movies on NTSC dvd's and i have some problems riping it using divx5. The problem is deinterlacing the video and the divx movie have artifacts that are so enoing. So after I read articles on deinterlace and inverse telecine I found something interesting at: http://nickyguides.digital-digest.com/interlace.htm
The text is :
"DVD & TELECINE
DVD's offer a strange twist to the whole Telecine and 3:2 pulldown business. Almost all DVD's will have the movie stored as whole pictures at 24 fps. This is the original format of the film with no Telecine. At the start of every Mpeg-2 DVD file there are certain header codes that tell it how to play back the DVD. Since it is stored digitally it can give the fields or frames from the DVD and to the hardware or software in any order it likes. It can split the movie into two fields and perform telecine instantly. To do this has three flags that can be applied to the header code: RFF (repeat first field) TFF (top field first) and FPS (frames per second).
For a PAL DVD the FPS flag can be set to 25 and the DVD will send the picture information to the hardware at 25 fps instead of 24 fps as is stored on the DVD.
For NTSC DVD's the movie needs to be 29.970 fps so the FPS flag is set to 29.970. But this looks odd because the movie is over far too soon. Imagine it like playing cards, if you throw 4 cards on the floor every second the whole pack will be finished in half the time than if you threw 2 cards onto the floor. The solution is to telecine the movie with 3:2 pulldown to increase the amount of "cards" we have to start with. To do this it uses the RFF and TFF flags are set in the header code. By setting the DVD to Repeat the First Field again you make the video display the fields in the order 3, 2, 3, 2. By setting the TFF flag you set the DVD to start from the top field so the order always goes: top, bottom, top, bottom.
Theoretically then, it should be possible to patch the header code of a DVD's Mpeg-2 file and make it play back at 24 fps instead of the 29.970 fps! In fact some people have made patches to do this."
So it is posible to patch the header code of the dvd's?Of course I belive that the 'pal'videos are more easy to rip and of course the quality is great. Is there anybody that know how to do that? Is DVDDecripter able to do that?
The text is :
"DVD & TELECINE
DVD's offer a strange twist to the whole Telecine and 3:2 pulldown business. Almost all DVD's will have the movie stored as whole pictures at 24 fps. This is the original format of the film with no Telecine. At the start of every Mpeg-2 DVD file there are certain header codes that tell it how to play back the DVD. Since it is stored digitally it can give the fields or frames from the DVD and to the hardware or software in any order it likes. It can split the movie into two fields and perform telecine instantly. To do this has three flags that can be applied to the header code: RFF (repeat first field) TFF (top field first) and FPS (frames per second).
For a PAL DVD the FPS flag can be set to 25 and the DVD will send the picture information to the hardware at 25 fps instead of 24 fps as is stored on the DVD.
For NTSC DVD's the movie needs to be 29.970 fps so the FPS flag is set to 29.970. But this looks odd because the movie is over far too soon. Imagine it like playing cards, if you throw 4 cards on the floor every second the whole pack will be finished in half the time than if you threw 2 cards onto the floor. The solution is to telecine the movie with 3:2 pulldown to increase the amount of "cards" we have to start with. To do this it uses the RFF and TFF flags are set in the header code. By setting the DVD to Repeat the First Field again you make the video display the fields in the order 3, 2, 3, 2. By setting the TFF flag you set the DVD to start from the top field so the order always goes: top, bottom, top, bottom.
Theoretically then, it should be possible to patch the header code of a DVD's Mpeg-2 file and make it play back at 24 fps instead of the 29.970 fps! In fact some people have made patches to do this."
So it is posible to patch the header code of the dvd's?Of course I belive that the 'pal'videos are more easy to rip and of course the quality is great. Is there anybody that know how to do that? Is DVDDecripter able to do that?