HDV to DVD interlace field order - depends on export path!

Question

Summary: Export... -> Using Compressor versus compressing an Export... -> QuickTime Movie file, produces different field orders in the resulting MPEG.
In Detail: Here is my HDV to DVD (MPEG2) process;
Create a DV sequence, and drop the HDV into it, it gets resized, and has a filter to shift the fields by +1 added to it, and is scaled to the correct size for 4:3 (letterboxed) or 16:9 (fills 720x480) - which is fine.
Set the Quicktime Video Compressor for the sequence to 'None', and set the Video Processing -> Motion Filtering Quality to 'Fastest (linear)' as I don't like what Normal or Best does to the image (makes it pixally, check in the canvas).
Now, if you Export -> Using Compressor, and setup a 2-pass mpeg 2 encode, you get a very good image, no via - DV artifacts. I also add the channel blur, set to 1 on all channels, if its too sharp - channel blur does not blur between fields, like flicker filter does, so the motion is not compromised, and looks excellent, but it stops sharp still images from flickering.
However, this is really slow, FCP is tied up, and for a 2 pass encode, any blur or colour filters get applied twice, its also harder to hand this off to a second machine to get on with.
So, logically, you would instead, Export... -> QuickTime Movie... -> Current Setting, Make Self Contained and then load that into Compressor, apply the SAME settings you did Using Compressor... At which point, the FUN begins.
I have finally narrowed down, that this changes the field order, although I nearly went mad discovering it - every time I thought my little 10 second test worked, (exported from the timeline) I would save the whole thing out and compress it, only to find, the interlace order changed, and now needed the field shift removed! And, because my little test worked, I would then do the whole thing, some 20+ hours later, only to find it was wrong!
Export... -> Using QuickTime Conversion... is the same as QuickTime Movie...
Anyone else with experience of this ? It was maddening! But I think I am over the worst of it now! Is there any solution for unifying this for all export methods ?
When it works DVD's encoded from HDV look amazing.
When it works.....
FCP 5.0.4
Compressor 2.0.1
PowerBook G4   Mac OS X (10.4.4)  

Answer 1

Hi Ben,
Ignore the Apple-0 (zero) part - that's just the key shortcut for the sequence settings. (press the Apple Key, and a Zero key with a sequence selected)
So, from the top: (although I'm not in front of my machine right now, so this is from memory)
Create a new DV sequence, 4:3 or 16:9.
Drop the edited HDV sequence into the DV sequence.
De-select the HDV sequence in the DV time line, bring up the Sequence Settings Dialogue for the DV sequence. (make SURE it isn't the sequence setting dialogue for the HDV sequence)
In the sequence setting dialogue, change the codec from DV to None (note - not the same as Uncompressed). If it's currently HDV, you have the wrong sequence, leave it as HDV, close the dialogue, and bring up the setting for the DV sequence.
On the 'Video Processing' tab, for the DV sequence, set the 'Motion Filtering Quality' to 'Fastest (linear)'
Choose OK to close the settings dialogue.
If you want to, and it depends on your footage, add the following blur filter to the HDV sequence in the DV timeline:
Select the HDV sequence in the DV timeline, right click (or hold ctrl key, and click) on the HDV sequence in the DV timeline, and choose the top item in the pop-up menu, 'Open' (in viewer). Click the filters tab of the viewer, you will see the Shift Fields filter, set to +1, added by FCP, add the channel blur, above the shift fields filter. Set the blur to 1 on each channel. I prefer this to the Video -> Flicker Filter, as channel blur does not blur between fields, so it does not blur motion.
I discovered this by accident
Now Save, the following sometimes crashes FCP. Check it in the Canvas viewer, set to 100%, with the channel blur, around text and sharp contrast areas, you get a nice soft blur, turn off that filter if you think its too much.
On to the encoding:
The simplest step, is to choose the DV timeline, and export via compressor. Pick a 2 pass MPEG preset, that matches the 4:3 or 16:9 of the sequence, and submit. This takes a while, on slower machines.
The alternative, which can reduce the time, is to export the DV sequence as an uncompressed QuickTime file - this does not change the quality at all - but can speed things up, because FCP is quite slow at delivering frames to Compressor, compared to Compresser just reading the frame from an uncompressed file, Compresser has to read them twice for 2 pass MPEG encoding. However, you need a lot of fast disk space to store the uncompressed footage.
Hope this helps.
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Hit the beach on Sunday, good times