Why does hitting the Single Field checkbox in QT remove lines from my video?

Hi, when reviewing my HD video's I see annoying lines. However I went into the video track and hit the Single Field checkbox and they went away. The deinterlace checkbox did absolutely nothing however. Does this simply mean the footage is progressive but quicktime was just reading it wrong initially?
Very intereseted in knowing the answer.
All the best
Kevin

Ok, maybe you can help me. I was sold some software that was meant to output progressive files in the AVI container with the MJPEG codec. I told him the software seems to be outputting interlaced files and this was his reasoning. Is he correct or is he taking me for a ride? This is a little beyond my knowledge of video systems so if anyone and help me please do.
They are Progressive Segmented Frames (PsF). This means they are progressive frames but with their information spread across two fields of an interlaced frame. Remember, interlacing is something added to the output of video to facilitate display requirements; it doesn't exist inside your PC. Odd, yes, but this is handy because if you had a true native progressive feed and tried to watch it on a display monitor that only supported interlaced input, you would not get an image. Also, PsF streams allow you to effectively use an interlaced camera to create progressive frames because, again, in a PC or MAC, there is no such thing as interlacing and during capture of each film frame, nothing moves between fields. Everything ends up progressive though carried on interlaced fields.
Forget film for a moment: Even when you shoot live video with an interlaced camera, the two successive fields for each frame are ALWAYS handled as one progressive frame inside your NLE, which usually displays only one of the fields during editing while the other field just goes along for the ride unseen. When you output the file or watch it on an external video monitor, the frames are then again broken up into fields to facilitate ease of playback on a variety of displays. If you were to deinterlace that video footage on your NLE, it would drop one field and use the remaining field to artificially create the missing field information to create one progressive frame. However, the output file would then be a PsF file because, even though the frames are now progressive, they are still being carried by an interlaced medium.
Likewise, when you use your progressive camera to create a live image, believe it or not, the video output is a PsF stream. That means the progressive frames are carried in two successive fields. The PC or Mac doesn't care that the information for each progressive frame arrives in two parts because, as mentioned earlier, the two parts are handled as one frame inside the NLE during editing.

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Why does hitting the Single Field checkbox in QT remove lines from my video?

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