Video Flicker & Creation of SD DVD (16:9) from a HDV edit...

Hi Everyone,
We have just completed a project on HDV.
Shot on HDV using Sony FX1E
HDV Edit using FCP HD
Video Card is Declink HD Extreme.
Problem 1:
Flicker while we render video:
When we render the timeline, the rendered output some times has a flicker that appears. It happens to everything, video, background animation done using motion anything you name. Then if we re-render the same, it goes off next time itself or sometime later. Not quite sure when and why ? We have to check to ensure no flickering is there before we step into the next stage.
The only problem that i could think of is. We have only 1 harddisk in the system. So the OS is in the same drive in which the project is also getting executed.
Problem 2:
Creation of SD DVD (16:9) after finishing HDV edit.
Compressor, the **** product is a royal waste or is that we do not know how to use it. or should we be using something else to make a SD DVD from a HDV edit.
We completed the project by taking a Uncompressed movie output and taking it into another Matrox sytem and created a SD DVD using Adobe Encore DVD. So the job got over, but what is the way to do the same in FCP & DVD Studio PRO.
Making a HD DVD is perfect, we tried that and it worked well.
We look forward to the comments from all you experts.
Thanks in advance.
S.Venkatesh
Power MAC G5 Mac OS X (10.4) Decklink HD Extreme - Video Card

One of the interesting and clever things about OSX is that data is not necessarily written to disk when you think it is - it first goes into a buffer and the buffer is written to disk at times of the OS's choosing. This allows the OS to handle multiple tasks etc. 'at the same time' - it stores things up and then milliseconds or perhaps seconds later writes them to disk. Remember that this includes all processes - and when OSX is running there might easily be literally hundreds of separate little OS-level programs running, all needing to do this or that with files on disk, not just the programmes you think you have running, like FCP or Safari.
The net result of this is that you have no control over when the disk is needed by the OS - and although this isn't a problem normally if you're using Safari or Word or something, when you are handling streaming media like video, it can be a very big problem. If you are playing a piece of video (which must maintain a constant data rate) and the system absolutely HAS to do something to or from disk, your video playback can take a hit, skipping a few frames. If this happened on a long playout to client it would be uncomfortable, but if it happened on your delivery master it could be horrendous.
If you keep your media on a separate disk, the problem disappears, as OSX can do whatever it needs without interrupting the flow of video off the other drive.
So don't so it, it's just waiting to bite you in the a55.

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