PROGRESSIVE vs. INTERLACED

[mverta]

When I select "progressive" output on my DVD player, is it playing a progressive stream, or de-interlacing an interlaced stream?

Or... is the source material encoded at 24fps but has some sort of "interlace playback" flag or something, for non-progressive players?

What's the deal?

_Mike

[jggimi]

Telecined NTSC DVDs usually contain "pulldown flags" -- that allow the player to output progressive 23.976fps frames. It is effectively doing an Inverse Telecine of the type done by DVD2AVI or DGIndex software -- it uses the flags, it does not examine the video stream.

It can't do this on any content that was never Telecined, such as that shot with a video camera.

For more info on Inverse Telecine, see www.doom9.org/ivtc-tut.htm.

[Kika]

If you are talking about progressive scan, the Player will deinterlace interlaced Video. And if you have a player with a dump progressive scan, it will perform deinterlacing on ANY material you are playing - even progressive Video.

But the way progressive scan works is different in NTSC and PAL.

[jggimi]

Good clarification. My NTSC player's manual states:When the player plays back a film source material, Progressive (uninterlaced) output signals are created using the original information. When a video source material is played back, the player interleaves lines between the interlaced lines on each to create the interpolated picture and outputs as the progressive signal.