Difference between 14.985 (internally 29.97) and 29.97??

[LisaB]

I have a 14.985 fps avi, so I assume that the best choice in TMPGEnc is:

14.985 (internally 29.97)

This way, I guess, it will only actually store 14.985 fps in the file, but will play back at 29.97 in my standalone. This should save on bitrate, so I can have more quality for a file of the same size (i.e., no need wasting file size storing duplicate frames)

I just tried encoding the avi using 14.985 (internally 29.97). But, when I open it in VirtualDub and do file-->file information, it says the resulting mpeg is 29.97! Why?

I know that in the past when I encoded to MPEG2 using NTSCFilm template, VirtualDub would give me info on the actual frames (23.976) and not the playback frames (29.97), so why isn't it doing the same here?

How does TMPGEnc achieve 14.985 (internally 29.97)? Does it use some kind of flag to tell the player to duplicate every frame? Does this work for both MPEG1 and MPEG2? Am I really saving on size by choosing this instead of a straight 29.97?

Help!

[FulciLives]

Hello

Well if the conversion you did plays back correctly and the audio is in synch then I would just leave it like it is and not worry about what VirtualDub says about the framerate.

I once downloaded a clip that was 15fps and when I tried to encode it with TMPGEnc using the NTSC DVD template it ended up running too fast. It other words the first 1 second of the original was now 1/2 a second so that the playback speed was about double. Not only did it look silly at double speed but of course the audio didn't match up.

At the time the clip was something I wanted to watch but nothing I needed to keep really so I just used my video card output to play back the original 15fps file and recorded it on VHS so I could watch it on a TV (the quality of this clip was poor overall so I didn't "mind" the VHS quality).

So if your clip plays back correctly then I say you picked the right setting with TMPGEnc

- John "FulciLives" Coleman