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Old August 21st, 2007, 01:10 PM   #1
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FCP HD rendering

Recently, I did a HD project and FCP needed to render almost anything I did that SD doesn't require. For example, adjusting the speed, color correction filter, or transitions. So my question is this a hardware or software issue, or is it the nature of HD? Having to render a 2 hr dance recital just because I've adjusted the brightness is a deal breaker for me.

Btw, I'm using FCP5 on a G5 dual 1.8 tower. I tried it on imac Intel Duo 2.0 and it also needs to render a lot too. I don't want to purchase a new system just to find out its a little quicker but still needs to render every little change I make.
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Old August 21st, 2007, 03:39 PM   #2
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Even in SD, unless you are going to print to tape, any change that you make to the original video will require a render. Some effect may playback in realtime, but they still have to be rendered before exporting. To make matters worse, working in HD (not knowing your codec) requires a lot more horsepower because your working with larger images. HDV can be painful to work with on an old system.

One more reason to get everything right when filming.
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Old August 21st, 2007, 05:51 PM   #3
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Rendering SD DV on my dual 2.5ghz G5 is trivial unless you've done something unusual like slow motion. You can use the 3 way color corrector overlaid tracks with opacity changes and it renders that really fast.

Not so with HDV unfortunately. And dropping an HDV clip into a 16:9 SD sequence results in a really long render - around 5 hours for a one hour sequence on my machine. The results were not so good either, as discussed in another active thread here.

At this point I'm waiting until I can get an Intel machine before upgrading to FCS 2, and that might be a little while since I decided I needed a new car more than a new computer :-)
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Old August 21st, 2007, 11:03 PM   #4
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I did some research and discovered its mainly because its HDV codec that requires a lot of cpu power and as a result real time rendering doesn't work. So while a faster cpu would render faster I just need to use a less compressed codec. thx for the input guys.
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Old August 22nd, 2007, 02:08 PM   #5
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Pete-

You're right to look for a new codec. HDV is very time consuming because of the temporal compression. I have had good luck with AIC, but it has put a limit on the number of projects that I work on at a given time due to hard drive constraints (expect 1 hour of footage to be @ 43gigs). In the newer incarnations, AIC looks great to me and moves quickly. Although, it still is not as quick as DV, the quality trade off is worth it to me.
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