How is the resulting FPS decided?

[gamerscloset]

I don't understand how agk decides what to use for fps? Or should I say VirtualDubMod.. either way.. I encoded 2 videos, both originally mpeg-2 sources. I had agk encode them both the same, with XVid, and yet one came out with a fps of ~52 while the other was ~29.. I forget the exact numbers, but you know what I mean. What would cause this?

So what fps do most desire for watching? I have my tv displaying 520p with powerstrip.

-GC

[Guest]

Please observe forum rule 9: Use a title that describes the content of your post. Thank you.

[gamerscloset]

noprob.

[jggimi]

...52 while the other was ~29..

We can't answer the question without AGK log files; but with DVD sources (480i or 480p, therefore), PAL will be 25fps, NTSC willl either be 29.97 or 23.976fps.

HDTV sources can have varying framerates; ATSC allows for 23.976, 24, 29.97, 30, 59.94, and 60 fps.

[gamerscloset]

Ahh, so with HDTV, it depends on the source? I didn't realize that.

So what if I record 2 shows all in one recording, one is at 29.97 and the other is at 59.94. If I then have agk encode the single file with 2 shows in it to XVid, will the resulting file be in 29.97 or 59.94? Is there a way to tell what the fps is for the mpeg-2 file that I have? VideoInspector and GSpot don't state.

Thanks,
GC

[jggimi]

You can open the file in VirtualDubMod (packaged with AGK). Use File...Open followed by File...Information and you should get the framerate.

Note that AGK analyzes input streams to determine if the content is progressive, interlaced, hybrid, or Telecined. Telecined content was originally 24 fps film that was transferred to NTSC video. Content at 29.97 or 59.94 may have been Telecined. AGK may conduct an Inverse Telecine by one of several methods, if so. Inverse Telecine (IVTC) alters the framerate. You may have 29.97 input and get 23.976 output. See www.doom9.org/ivtc-tut.htm for more info.