Upper/lower field first...no difference

erdna · Post by **erdna** » Tue Jun 09, 2009 10:01 pm

When I put an AVCHD clip, containing pretty fast moving objets, on the timeline, then go to "Share" and "create disc", and choose for DVD HQ I get a perfect DVD, but whether the disc creating properties are set to upper or lower field first, I get the same pictures. Normal?

Post by **Ken Berry** » Tue Jun 09, 2009 11:00 pm

Was your original AVCHD filmed using 'progressive scan' similar to Frame Based. If so, then when interlaced for your DVD, it can be either Upper or Lower Frame First...

Normally, though, I thought it would be UFF.

erdna · Post by **erdna** » Wed Jun 10, 2009 9:19 pm

My original clip is 1929x1080i. Couldn't it be that the original setting for AVCHD (being UFF) is also taken for the conversion to mpeg2 for the DVD creation, whatever field order is being chosen?

Post by **Ken Berry** » Wed Jun 10, 2009 10:58 pm

If I understand what you are saying, I would not have thought so. If you start with UFF mpeg-4 and put this in the burning module, it will still have to be converted during the burning process. In other words, it is not DVD-compatible, so the box 'Do not convert compliant mpeg files' will not apply, whether it is ticked or not. It will be the burning properties in the window above that which will apply.

In your original post, you said you get a perfect picture regardless of what the "disc creating properties" are set to (i.e. LFF or UFF), so I assumed you tried both by manually changing those properties, including manually changing the field order from UFF to LFF. If you didn't do that, and the default Field Order setting in the Burning module remained UFF regardless of any other changes in the properties you may have made, then yes, it would always be (correctly) UFF in the final DVD.

erdna · Post by **erdna** » Thu Jun 11, 2009 12:45 pm

Indeed Ken, the AVCHD (mpeg4) clip has to be converted to mpeg2 for DVD, so the "compliant file.." makes no sense. But it is exactly in the window above that I changed the field order. I did this several times, and verified on a digital display and on an analog monitor. I always get the same result: smooth motion, and the same "mousetheets" on frame freezes

Post by **Ken Berry** » Thu Jun 11, 2009 1:32 pm

"mousetheets"

erdna · Post by **erdna** » Thu Jun 11, 2009 3:05 pm

Sorry, mistyped. Should be "mice teeth", and this stands for the effect what you get in a freeze frame with interlaced video with horizontal moving objects.

Post by **Ken Berry** » Thu Jun 11, 2009 11:02 pm

Ah!!! Jaggies...!!

erdna · Post by **erdna** » Fri Jun 12, 2009 7:39 pm

Not exactly jaggies, which to my knowledge occur on nearly horizontal lines, also known in still photography, and not known as an interlacing artifact I think. What I mean can you see in the third image in http://www.100fps.com/ mentioned as "mice teeth"