Selur's Little Message Board

If you are uncertain if a source is interlaced, telecined,... it helps to look at the frame patterns that occur if you Bob deinterlace the content.
That said, here are the typical patterns you might encounter:
Typical interlace patterns:

1. content is progressive:
   • applying AssumeTFF().Bob()* you will see: stop -> forward_movment -> stop -> forward_movement **
     
   • applying AssumeBFF().Bob()* you will see: stop -> forward_movment -> stop -> forward_movement **
     
   
   
2. content is field shifted:
   • applying AssumeTFF().Bob()* you will see: backwards_movment -> forward_movment -> backwards_movment -> forward_movment **, ***
     
   • applying AssumeBFF().Bob()* you will see: forward_movment -> stop -> forward_movement -> stop **, ***
     
   
   
3. content is interlaced TFF:
   • applying AssumeTFF().Bob()* you will see: forward_movment -> forward_movment -> forward_movment -> forward_movement **
     
   • applying AssumeBFF().Bob()* you will see: forward_movment -> backwards_movment -> forward_movement -> backwards_movment **
     
   
   
4. content is interlaced BFF:
   • applying AssumeTFF().Bob()* you will see: forward_movment -> backwards_movment -> forward_movement -> backwards_movment **
     
   • applying AssumeVFF().Bob()* you will see: forward_movment -> forward_movment -> forward_movment -> forward_movement **
     
   
   
5. content is interlaced XFF with blending:
   • same as the corresponding interlaced pattern, but you will also see some blended (= ghosted) frames in-between
     
   
   
6. content is telecine:
   • applying AssumeVFF().Bob()* you will see 3 times forward_movement 2 still frames
     
7. content is mixed:
   • applying AssumeVFF().Bob()* you will see a mix of any of the above
     

* in Hybrid you would use QTGMC+Bob
** then moving through the content
*** or vice versa

Cu Selur