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Recording output of DVX100 on AJ-SD93
If I hook up my DVX100 to my AJ-SD93 DVCPRO 50 deck via firewire would I get the better compression ratios of the DVCPRO 50 format? We do alot of blue/green screen work in our studio and I’d like to phase out the old BetaSP camera.
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4 Replies
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No, the FW output from the camera is DV25.
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What I do is either bump the footage to another format and capture, or use a DV deck with component or SDI on capture. The problem in DV though the capture is clean, when you render the codec recompresses. Some DV codecs are better than others, but generally (especially with Apple’s DV codec) the codec introduces aliasing and artifacts in the render. Long discussion and argument about this in other forums. If you use a Kona or Decklink or similar and capture uncompressed, you’ll bypass the DV recompress on render. You’ll wind up with a cleaner product.
-mjd
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If you’re capturing through the firewire, the codec has already compressed the footage. The firewire output is compressed DV.
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Rob,
You can also consider doing it with Natress filters. He provides a set of filters that actally re-interpolates the DV footage to remove a lot of the edge pixelation that DV keys are so famous for.
You might want to look at some of his test results on his page for exactly this type of thing. DV25 never gets any better when it is captured uncompressed, but this does prevent the further degradation that renders can cause. You also go from 3.8 MB/sec for your file sizes to almost eight times that size (27MB/sec uncompressed 10 bit). Your workflow is affected because you will need much faster drives (RAID FOR SURE) and a card to get that quality of video into the machine. Graeme’s products will allow you to maintain a DV workflow and his filters work with any compression level.
Graeme spoke at our FCP user group in Toronto recently and works tirelessly at creating filter sets and squeezing the most out of DV video.
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