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BpeteFLA
encoding with field based picture structure
on Oct 13, 2006 at 6:16:58 pm

I've run into a problem using Procoder mpegs in Adobe Encore, but have found a solution on one of the forums to encode with the setting "always field based" in the picture structure.

Are there any potential problems with this? Could it cause an error in the glass mastering process? Or compatibility problems?

Thanks,
Bpete


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Frippy
Re: encoding with field based picture structure
on Oct 13, 2006 at 6:52:57 pm

No
No compability problems, no encoding problems

Fields - is NORMALLY for interlaced video materials
Frames - for progressive scan video

For testing you can use Real Magic Hollywood+ or XCard or Quadrant cinemaster - your DVD will play on your TV fine!

Attention: don't set upper_field first to lower_field video and lower_field to upper_f video!!!




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WTS(JManz)
Re: encoding with field based picture structure
on Oct 14, 2006 at 3:58:21 am

There is a potential problem with this, but is probably limited to a very few legacy/older players. Pete, you are tapping into a more hidden option within Procoder for mpeg encoding. Unfortunately the terminology used can be confused with the field order for mpeg output--which is often confused with the field order of the source material.

DV source material is typically LFF (lower field first). It's imperative that the encoder (in your case Procoder) recognizes the field order of the source file correctly. Generally that is the case, but if you know it is incorrect, Procoder will let you change it. Many encoders shield this 'choice' from the user, and you don't even see that step. Many often confuse the target output of Procoder (where you can set the output for the final file's field order) with the source or input field order setting. The best setting (and the default for Procoder) is for UFF (upper field first). Some have misinterpreted using that choice (UFF) as being inappropriate since the source file was LFF. They are two different beasts, and without muddying the waters further, UFF for mpeg file OUTPUT is the most compatible.

Now, to confuse issues further, you are even given the option of choosing 'auto', 'field', or 'frame' based picture structure. This has nothing to doing with whether the source file was interlaced or progressive. It has to do with how Procoder 'packages' the data. Many commercial dvd's have field based picture structure, so you shouldn't have to worry. Unfortunately there are some older players that didnt' do well with field based picture structure. To top it off, Procoder (up to the first release or so of 1.5) did something with the way it field encoded that it also added to the problem. That has been fixed (as best as I know). What ideally should you choose. "Auto" is theoretically the best--using frame for still shots and the like, and field based for action/motion. You would perhaps get the best looking encodes, but obviously if it causes problems with your authoring system it's best to use what works, and not 'split hairs'.

Jim


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BpeteFLA
Re: encoding with field based picture structure
on Oct 15, 2006 at 5:04:02 pm

Thanks Jim. That's first class info and a big help with the tension here as the time noose tightens and Encore 2 keeps spitting out Procoder encodes. We ran tests on Field based encodes from Procoder and they are accepted by Encore 2, but in our case at least they are very-very sluggish. Clicking around in the timeline causes "internal engine error". If you put the FBE in the Encore 2 timeline and let it play it will play through. So working with the FBE is a royal PITB (pain in the butt) but way better than locking up and crashing.

The most interesting thing is we pressed on and test burned a RW DVD even with the unhappy encodes in the timeline. They work just fine once they are on the disk. No pixeled frames to be seen ... so far at least. The replicator says, if it looks good on your disk burn it will do well on the DLT and glass master. Hope he's on target. BTW ... is this the same Jim as on Canopus forum? If so ... thanks for both replies.

Bpete



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WTS(JManz)
Re: encoding with field based picture structure
on Oct 15, 2006 at 10:15:42 pm

Yep, I'm the same Jim. Glad to be of some help. I thought I would try to get a reply to you here or there.

Jim


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