[HELP] Convert 29.97 to 23.976

[Selur]

video movie (NTSC, SD).

Since I'm unsure on how to interprete that, try the following:

• load the source in Hybrid
  
• Overwrite the scan type to progressive in case the content wasn't detected as progressive which I assume.
  
• check the Vapoursynth preview (and look at a scene with horizontal movement): Do you see combing artifacts?
  No -> your content is progressive and you should use sRestore to get to the frame rate you want to go. Finished.
  Yes-> your content isn't progressive.
  
• Overwrite the scan type to either tff or bff in case it was detected as telecine or progressive
  Hybrid now should select QTGMC as deinterlacer
  
• enabled the Bob-option in QTGMC
  
• check the Vapoursynth preview (and look at a scene with horizontal movement): Do your see motion from one frame to the next for each frame?
  Yes, each frame differs from the next -> your content is interlaced. Make sure the scan type is either tff or bff, use QTGMC in Bob mode and use sRestore to get to 23.976. Finished.
  No, there are three frames which differ and a forth that is repeated once -> your content is telecine, make sure the scan type is 'telecine' and use an IVTC method. Finished.
  
• No, there is a fixed pattern to repeated frames but it isn't 3:2 -> you require a non-common pulldown. Make sure the scan type is set to 'telecine' and adjust the settings to handle your content. If you end up with a frame rate above 23.976 use sRestore to archive it. If you end up with a frame rate above 23.976 fps use an interpolation method to archive 23.976 (depending on the chosen method an additional sRestore call might be needed). Finished.
  
• No, there are repeated frame but there is no pattern to it. -> argh, your content is shit. Set the scan type to either tff or bff, use QTGMC Bob and then sRestore to archive 23.976.
  

Once could also use some blend deinterlacing + decimation, to go from 29.97fps interlaced to 23.976 fps, but that is something Hybrid does not and will not support, since I thing that blend deinterlacing is and always was a bad idea.

Cu Selur

Ps.: for general handling of content questions, better go to a forum like videohelp.com or similar so that you can get the opinion of other folks on how to handle content. Especially if you are not hell bend to use Hybrid.