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DVCPro HD good for Aquisistion, But not Post?
The DVCPRO HD codec compresses data using a variant of DCT , also known by many as ( discrete cosine transform) algorithm. While fine for the acquisition stage, it’s not in the more complex post production environment.
What choices do we have to get the footage away from DVCproHD once it’s acquired? This will be questions many will ask. This is going to be an important element when building your HD workflow for your studio and those of us that are doing more visually complex post production work.
For those that want to go to large screen projection. DCT artifacts start to look bad quite quickly. Worse looking on digital projection systems. Since the industry is going to bank roll the HD projector technology for up to 3,000 projectors in the USA, this is something to consider for those artists that are also concerned about the highest standard of quality possible from their hard work on a large screen system….
PS: Here is a short article I wrote on the JVC GY-HD100u and AG-HVX-200
https://www.pbase.com/aghvx200/pappasarts_entertainment_
Michael Pappas
PappasArts Entertainment
https://www.Pbase.com/ARRFILMS
Pa********@*****il.com -
4 Replies
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The DVCPRO HD codec is not alone.
DCT – THE TRANSFORM: THE KEY TO COMPRESSION Small blocks of pixels are converted from the spatial domain to the frequency (detail) domain by a mathematical process known as a discrete cosine transform (DCT). There have been other forms of image compression developed, including wavelet- and fractal-based forms, but DCT is used in all compressed DVTRs from all manufacturers. It’s also used in most disk-based video compression systems. It is the basis for MPEG, JPEG, M-JPEG, DV, Betacam SX, Digital-S, DVCAM, DVCPRO, DVD, HDCAM, Digital Betacam, and Ampex’s identically named DCT.
Read the whole artical, it’s a little old, it’s Panasonic oriented but it’s not too long and quite interesting.
discrete cosine transform -
Thanks Rennie !
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Hey it could be worse… you could edit on HDV! ;-p
Seriously though, aren’t there a number of other HD codecs appearing specifically for editing and post?
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Michael,
I have now read this post on two forums and if I go to DVInfo I will probably find it there as well. I am not sure of your motivation, but in all honesty, I find that these sorts of posts make the waters even more confusing. Frankly the DVCPRO HD codec is fit for post production. I have seen a good number of films that were shot with the Varicam, and shot with the DVCPRO50 camera, the SDX900, all blown up to film and the DCT did not get in the way. I have seen the SDX900 footage blown up to a 35′ screen without even going to HD upconvert and it was gorgeous.
Please note that virtually all of the digital formats use DCT, including HDCAM and by your reasoning it too would be unsuitable. There are those that would move to another codec for certain processes but as a standard rule, they would not. If it were me and I had graphic work to do, I would probably just go to an uncompressed domain for such work.
Thanks,
Jan
Jan Crittenden Livingston
Product Manager, DVCPRO, DVCPRO50, AG-DVX100
Panasonic Broadcast & TV Systems
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