I Have a couple questions about pro/prosumer codecs…
1. Panasonic’s DVCPRO HD uses 4:2:2 chroma subsampling. From Wikipedia, I see how 4:2:2 subsampling is superior to the 4:2:0 of HDV or AVCHD. (And it’s obvious why DVCPRO HD’s intraframe compression is superior to the interframe compression of AVCHD or HDV.) But both appear to be 8-bit formats. What exactly is the difference between 8 and 10-bit codecs, if it does not appear to have to do with the color subsampling?
2. Why don’t more cameras use high-quality codecs? Sandisk is now making solid state hard drives for laptops that can record 200 MB/sec. One that stores 256 GB is about $500. So the technology is there, and its cheap. It would seem that something like AVC-Intra 100, for example, could be cheaply implemented as a prosumer standard. But the cheapest camera using a codec of this quality is $10K and records on expensive P2 cards ($2500 for a single 64 GB card). I don't know of another high quality codec that is any cheaper. Why do you suppose this is? Editing software support? Marketing tactics (make people buy more expensive cameras in the line)?
Thanks in advance,
Chris
1. Panasonic’s DVCPRO HD uses 4:2:2 chroma subsampling. From Wikipedia, I see how 4:2:2 subsampling is superior to the 4:2:0 of HDV or AVCHD. (And it’s obvious why DVCPRO HD’s intraframe compression is superior to the interframe compression of AVCHD or HDV.) But both appear to be 8-bit formats. What exactly is the difference between 8 and 10-bit codecs, if it does not appear to have to do with the color subsampling?
2. Why don’t more cameras use high-quality codecs? Sandisk is now making solid state hard drives for laptops that can record 200 MB/sec. One that stores 256 GB is about $500. So the technology is there, and its cheap. It would seem that something like AVC-Intra 100, for example, could be cheaply implemented as a prosumer standard. But the cheapest camera using a codec of this quality is $10K and records on expensive P2 cards ($2500 for a single 64 GB card). I don't know of another high quality codec that is any cheaper. Why do you suppose this is? Editing software support? Marketing tactics (make people buy more expensive cameras in the line)?
Thanks in advance,
Chris