DGIndex to WME question

[victorypoint]

Hello,

I've ripped some NTSC DVDs with DVDDecrypter and created small WMV movies to playback on my Pocket PC but am a little confused about the proper encoding procedure. After ripping the movie VOBs, I create a d2v file and demux the AC3 with DGIndex. DGIndex reports the VOBs are FILM Progressive Frame so I'm using "Field Operation -> Force Film" to capture at 23.976 fps. I then convert the AC3 to 2-ch WAV with BeSweet and frame-serve the d2v and wav to Windows Media Encoder 9.

What I'm confused about is will the audio be in sync with the d2v file now that it's inverse-telecined to 23.976fps? If I chose "Field Operation -> None" and captured at 29.97fps telecined, would the audio still be in sync with the d2v? In WME, do I assume the d2v is properly inverse-telecined and choose 23.976 fps for the output? Does this cause any audio sync problems?

Any help is greatly appreciated.
-AJ

[Cyberia]

Neither field operation should affect the audio sync. The audio should be in sync with either option.

Since this is progressive video, then Force Film is what you will want to use.

For information on what Force Film actually does, please read the sticky threads at the top of the forum, especially the FAQ and the Essential Reading post.

[victorypoint]

Great, thanks for the response. I read all the stickys but was still unclear about video/audio sync with 23.976 vs 29.97 frame rates. It makes sense now because the movie duration doesn't change, just the frame rate. Does it matter if 23.976 or 24 fps is used in WME to encode Forced Film d2v files?

-AJ

[Cyberia]

No problem.

I'm not sure about your last question concerning WME. I have never used WME. You might have better luck asking that question in the General or Newbies forums.

[fccHandler]

Originally posted by victorypoint
Does it matter if 23.976 or 24 fps is used in WME to encode Forced Film d2v files?
Don't use 24, because that doesn't match the input rate and it forces WME to convert the frame rate (from 23.976 to 24) during encoding. This may cause jumpy or stuttering motion in the output video. Instead, type exactly "23.976," because that is the correct rate for an NTSC DVD which has been Force Film'd.

[niamh]

I read all the stickys but was still unclear about video/audio sync with 23.976 vs 29.97 frame rates

Well, they run at the same speed anyway ;). This isn't like PAL/NTSC issues where PAL runs faster.

And I see fcchandler answered the other question :)

[victorypoint]

Originally posted by fccHandler
Don't use 24, because that doesn't match the input rate and it forces WME to convert the frame rate (from 23.976 to 24) during encoding. This may cause jumpy or stuttering motion in the output video. Instead, type exactly "23.976," because that is the correct rate for an NTSC DVD which has been Force Film'd.

I did some more experiementing and found that if you enter 24fps (or 30 for that matter), WME will always use the max frame rate of the source (in this case 23.98fps). So it really doesn't matter as long as you enter a number equal or larger than 23.976.

-AJ