hoxlund wrote:im new to the whole progressive scan, 3:4 pull down
what does that pull down thing mean?
hoxlund meant to reference 3:2 pulldown (not 3:4). This question is in reference to the LVD-2001 Video Specifications
and has still not been answered. Liteon describes the feature as "480p Progressive Scan Video Output with 3-2 Pulldown Recovery".
3:2 pulldown is a term used when motion picture film frames are converted to interlaced TV (video) frames. Film plays at 24 frames/sec, and TV plays at 30 frames/sec for NTSC (USA, Japan, Mexico, etc). The conversion involves allocating two fields from alternate film frames to create an extra video frame, effectively transforming the playback from 24 frames to 30 frames/sec. The process by which this is accomplished is explained at What is the difference between interlaced and progressive video?
A non-interlaced progressive scan effectively doubles the number of lines on the screen compared to an interlaced picture and enhances viewing clarity. Computer monitors use progressive scan, and special progressive scan TV monitors can be purchased such as the Apex GB4308 43" Screen 480P Progressive Scan TV
Most DVD movies have not been NTSC interlaced, so they should play back through a progressive scan monitor without conversion. However, a number of DVD movies that were originally on film have been converted to an interlaced format with the "3:2 Pulldown" scheme. My take on the Liteon specification is that the LVD-2001 converts the interlaced DVDs back to the progressive film format.
is a term used to explain a process by which frames are added to increase the film frame rate to a TV frame rate . Inverse telecine (IVTC) is a process which reverses this conversion and returns the original frame rate, which is 24 frames/sec.. I would take Liteon's "480p Progressive Scan Video Output with 3-2 Pulldown Recovery" as an inverse telecine type conversion to allow DVDs which were converted to 30 frames/sec. interlaced format to be reconverted and recovered at 24 frames/sec. progressive scan film frame rates.