Converting from 120fps to 30fps

[shorto]

Hi all!

Just wanted to know if anybody knows how to convert fps in any software.

The thing is I have a source of 120fps and I want to add subtitles (.ass) and convert the 120fps to 30fps (or any other). I tryed using AutoMKV, but it does nothing when I choose convert the fps, and I tryed TMPGEnc but this software supports only videos with 60fps maximum. VirtualDub does not do any better in this matter.

Any ideas?

[manono]

AviSynth:

SelectEvery(4,0)

or:

ChangeFPS(29.97)

both of which tell you to keep only one of every 4 frames. Or, if using the TIVTC filter:

TDecimate(Mode=1,Cycle=4,CycleR=3)

which tells you to remove 3 duplicate frames out of every 4 frames. If you're going to mess with anime raws, you'd best learn some AviSynth. And, of course, there's a good chance the correct framerate isn't 29.97fps, but 23.976fps, or is a hybrid with both framerates in the episodes.

[edDV]

Where would one get 120 fps source?

For NTSC rates:
120 Hz HDTV sets either replicate 5 x 23.976 = 119.880 sometimes with intermediate interpolated frames,

or 29.97 fps is replicated 4 x 29.97 = 119.880 sometimes with intermediate interpolated frames,
or 59.94 fps is replicated 2 x 59.94 = 119.880.

For PAL rates
120 Hz HDTV sets replicate 5 x 25 = 125 sometimes with intermediate interpolated frames,
or 5 x 24 = 120 fps sometimes with intermediate interpolated frames.

Nobody broadcasts 120 fps.

[shorto]

edDV: 119.880 = ~120

manono; Thank you it worked!

[jagabo]

Where would one get 120 fps source?

A lot of anime is a mix of 29.97 fps interlaced, 29.97 fps progressive, and 23.976 fps progressive sources. These are often converted to ~120 fps (least common multiple) for P2P.

[edDV]

Where would one get 120 fps source?

A lot of anime is a mix of 29.97 fps interlaced, 29.97 fps progressive, and 23.976 fps progressive sources. These are often converted to ~120 fps (least common multiple) for P2P.

Interesting. That results in very large files.

[jagabo]

Where would one get 120 fps source?

A lot of anime is a mix of 29.97 fps interlaced, 29.97 fps progressive, and 23.976 fps progressive sources. These are often converted to ~120 fps (least common multiple) for P2P.

Interesting. That results in very large files.

Not really, most of the frames are exact duplicates so they don't take much bitrate.