DV stays DV? The 10x Re-Import Experiment..

.. on suggestions made in this thread ..
http://discussions.apple.com/thread.jspa?threadID=1088568&tstart=0
*The Set-Up:*
a SD/PAL import from a Sony miniDV, via firewire.
Project as 4:3
*The Procedure:*
Share/Export using Quicktime.. selecting 'Movie to dv-stream'
re-importing into iM08
sharing again ...
repeat 10x ...
*The Result:*
(click on pic for original frame size...)
both pics are simple 'grabs' from the QTpro player app, set to 'High'
pics are not processed in PSE ...
I did NOT do the 'magnification' ...!!
I do know, DV is a compressor; in my humble understanding of processes, my workflow does not contain any new encoding.. but, obiously: it does.
please comment..

Unless we get some feedback from a developer of iMovie '08, we can only guess. I must say iMovie '08 is an amazing piece of software: you can throw video clips in many different formats at it, make projects that contain clips in different resolution, pixel aspect ratio, and encoding. It performs non-destructive editing, you can scrub all your clips, and all rendering happens in realtime.
Now think about it for a minute from a software engineers view. How can it do that? You have to render a transition that starts in a 720x480 DV clip with rectangular pixels, continues into a 320x240 MPEG-4 clip with square pixels, and output the result as a 640x480 H.264 clip with square pixels. I would have solved this by "normalizing" all source frames into raw images of a consistent resolution and pixel aspect ratio, performing all video processing like transitions, titles, or other effects on these normalized frames, and then feed the results into the Quicktime encoding engine for output encoding.
So what does that mean for quality? And how does it compare to typical DV editing applications like iMovie '06? I don't think there is a straight answer. It all depends on your input and output formats. For DV-to-DV editing, it's not so good, because you can't have lossless editing. It's probably not the best for making DVDs from DV footage either, because DV is an ideal input format for making a DVD (same resolution and pixel aspect ratio). But it works great if for example you take MPEG-2 clips and output as H.264, because you go through only one transcoding step, directly to the target format.
Again, this is all just a theory on my part. But it explains a lot of the things we are observing. The slight bluriness introduced during DV-to-DV editing. When you export a widescreen project with 720x480 DV clips to Quicktime, why does it show you the current size is 960x540? I think that is the size of the intermediate frames that the rendering engine uses internally.
All this doesn't man iMovie '08 is a bad application, or worthless. Not at all. As I said in the beginning, it's quite amazing what it can do. It's ideal for many types of projects. It's just not the best choice for DV editing and DVD content creation.
Message was edited by: tilman

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