Does MPEG Mediator choose 25 or 30 FPS in anyway it likes to?

[UFOxyz]

I am using MPEG Mediator to encode. But I can't control the encoding FPS (frame rate per second) from MPEG Mediator.

MPEG Mediator encodes a VOB with 25 FPS sometimes, and sometimes encodes another VOB that was chopped from the same DVD source with 30 FPS. In this case, I can't use VirtualDUB to join them together.

Does MPEG Mediator have the saved setting, so that i don't have to choose Audio sample rate and possibly fixed sampling FPS as well?

[SeeMoreDigital]

Generally, MPEG Mediator generates MPEG-4 encodes at the same fps speeds as your source.

That said, when generating MPEG-4 encodes from NTSC "progressive movie" DVD sources it will automatically change the fps speed from 29.970fps to 23.976fps - effectively dicarding the interlaced frames and leaving you with just the progressive ones - aka: "Keep Film": -

http://img137.imageshack.us/img137/8082/016en.jpg


If however your source is interlaced, MPEG Mediator give you the option of generating an "non de-interlaced" (note the interlaced lines) encode, at the same speed as your source: -

http://img90.imageshack.us/img90/1685/027xw.jpg

...or an "de-interlaced" encode (note the interlaced lines have been removed), again at the same speed as your source: -

http://img87.imageshack.us/img87/4202/034ay.jpg


And no, there's no facility to "save settings"...


Cheers

[UFOxyz]

Thanks for your graphical help, i didn’t know the technical term as to what the comb looking lines were.

from 29.970fps to 23.976fps - effectively dicarding the interlaced frames and leaving you with just the progressive ones - aka: "Keep Film": -
>> Interlaced in my understanding is to use some kind of human optical illusion to make you think what you are watching looks smoother in 60 fake FPS called 60 fields per second.

I do not not want to have anything Interlaced, even though interlaced movies looked shaper but that was probably due to the conversion from Interlaced to progressive, viewed from a COMPUTER. So true progressive under the same condition must be shaper than interlaced if it is recorded in 60 Frames per second and not 60 fields per second. Am I right?

Is it safe to say if all movies with 30FPS are interlaced by the amount of 6 FPS, because all DVD’s true FPS is made of 24 FPS?

Ok, if so, from now on, I will only use 24 FPS and make it 24 FPS anyway I can.

[MrTroy]

Is it safe to say if all movies with 30FPS are interlaced by the amount of 6 FPS, because all DVD’s true FPS is made of 24 FPS?
Incorrect. Every 5 frames contain 2 interlaced frames. That's 12 interlaced frames per second.
Ok, if so, from now on, I will only use 24 FPS and make it 24 FPS anyway I can.Mind that there are also non-telecined DVD's, i.e. true 29,97fps. They can't be IVTC'd, you have to leave them 29,97fps.

[jggimi]

A good discussion of what telecining looks like from a frame and field perspective can be found in the first section of www.doom9.org/ivtc-tut.htm -- though the software described in this older tutorial is now out-of-date, the general information should be helpful.

[SeeMoreDigital]

I think what a lot of people get confused about are the differences in how MPEG-2 PAL and NTSC "progressive" sources are displayed FPS speed-wise compared to "pure interlaced" sources.

With PAL, "pure interlaced" and "progressive" sources run at 25FPS. But with NTSC, "pure interlaced" sources run at 29.970FPS and "progressive" sources run at 23.970FPS with additional "interlaced" frames taking the overall FPS speed back up-to 29.970FPS.

[mediator]

btw, unchecking "Keep Film" will not do a proper 3:2 pulldown, as it may suggest (means it does not repeat fields). I.e. if truly 23.97 progressive frames per second are coded in the stream, some of the progressive frames will just be duplicated in order to achieve 29.97 frames per second. This will result in jerky motion, especially visible for panning scenes. The possibility to deactivate "Keep Film" is there just to have more control of the process in case the auto-detection was wrong.

If some VOBs are imported with 25 fps and others with 30 fps, then most likely they do not origin from the same source material/movie.

-mediator