Changing framerate to reduce filesize?

[grennis]

Hello,
I have several DVDs which I would like to encode for use with Sony PSP. The DVD VOBs are at framerate 29.97 after extraction.

My questions...

1. Is it OK to reduce framerate to 24fps to reduce the final filesize and save space?
2. What should I use to do that, either ConvertFPS() in AviSynth, or something in DGIndex?

Thanks

[Terranigma]

Hello,
I have several DVDs which I would like to encode for use with Sony PSP. The DVD VOBs are at framerate 29.97 after extraction.

My questions...

1. Is it OK to reduce framerate to 24fps to reduce the final filesize and save space?
2. What should I use to do that, either ConvertFPS() in AviSynth, or something in DGIndex?

Thanks
1. Not only is it ok, it's recommended. You'd get a reduction in file size due to 25% lesser number of frames.

2. IVTC via Decomb or TIVTC.

[neuron2]

1. Not only is it ok, it's recommended. You'd get a reduction in file size due to 25% lesser number of frames.

2. IVTC via Decomb or TIVTC. Or DGIndex Force Film where possible.

[scharfis_brain]

the reduction only makes sense, if the source video itself has 23.976 fps.
if the source is 29.97fps progressive or 59.94 fields per second interlaced, it isn't good to reduce the framerate, cause it will yeild into motion judder.

[grennis]

the reduction only makes sense, if the source video itself has 23.976 fps.
if the source is 29.97fps progressive or 59.94 fields per second interlaced, it isn't good to reduce the framerate, cause it will yeild into motion judder.

Thanks. How would I know that? But what DGIndex says while it is scanning? Wouldn't DGIndex just preserve the source framerate by default?

[Sagekilla]

If it says 100% film (or even 99% film is fine) then you should do an inverse telecine. DVD's are made from native 23.976 film frame rate, but telecined so they're 29.97 fps and it's always recommended to inverse telecine them back to film rate thru IVTC or in DGIndex (force film)