IVTC

What will follow is a lot of technical and not easy to understand information. If you're don't want to go thru all the trouble then you may be best off simply enabling the Deinterlacer in FlaskMpeg and setting Timebase to 29.97fps, use ReMPEG2 or DVD2MPG which don't have that problem because ReMPEG2 only transcodes the video, leaving the video and the playback flags untouched, and DVD2MPG has an IVTC that works great. The first solution is a "bad" one, the other two are okay, although ReMPEG2 may not give you the same quality as TMPG and DVD2MPG requires an intermediary format.

Read Robshot's article on how film is transferred to video. Then read Inwards' article on Deinterlacing. Actually he's dead right: Deinterlacing is a bad thing, we'll have more frames than necessary and the action will be less smooth than if we go the hard way. There's no using saying much more about the issue that has already been said.

IVTC will allow us to reconstruct the original 24fps as shown in the movie theater while preserving synch. However the procedure is really hard to achieve. If you're not scared by a couple of more hours encoding time and some really nasty manual steps (these is not mandatory... some movies work without it) then you're ready for IVTC in TMPG. 

The IVTC decision matrix:

• You are using LSXs: Set Timebase to 29.97. Set the source as interlaced in the respective encoder program (usually that's the default.. LSX can even not encode frame based).
• You are using TMPG, CCE or Heuris but unwilling to spend the additional 2-3 hours the process involved: Set Timebase to 29.97, do not enable the Deinterlacer, set the source and destination as interlaced (I'll give you more info in the TMPG guide).
• You're still not afraid: Download FlaskMpeg multipass, and perform the IVTC as described in the IVTC guide. You may still come back to your decision if you should find that the auto IVTC hasn't worked properly. Important notice: You will have to unselect preserve aspect ratio in the Flask MPEG Options (Post Processing tab), and you'll have to reset the size to the default (go to the output pad and press Reset). Otherwise this won't work.
• Alternatively you can use DVD2AVI to do the IVTC, which should speed up the process a little.

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