Re: COW Articles: Video Editing Formats, Color Bit Depths, Codec Data Rates & Storage Requirements by Mark Raudonis on Nov 18, 2006 at 11:50:21 pm
This is a great "all in one place" chart. I'm printing it out now and putting in up on the wall. Thanks for pulling it together and publishing it for us.
A suggestion for an "update" to this info. What about some of the common compression schemes that AVID and FCP use... for example what's Off-line RT weigh in at per hour, DnXhd?, 15:1? Etc.
For anyone working in the classic "off-line to on-line" workflow, this information is important. I recognize that the trend is AWAY from that style of work, towards full res in and out, but there still are many people that need to work with much more compression in the off-line stage.
Re: COW Articles: Video Editing Formats, Color Bit Depths, Codec Data Rates & Storage Requirements by Graeme Nattress on Nov 19, 2006 at 12:46:53 am
A few corrections:
Both D2 and D3 are composite formats, for which 4:x:x chroma sub-sampling terminology doesn't make too much sense. They both digitized analogue composite (not component) video at about 17.7Mhz.
D-5 SD was missed out, which is an uncompressed 10bit component 4:2:2 format.
BTW, D-10 is better known as MPEG IMX, an I-Frame only 4:2:2 MPEG format.
HDCAM is 3:1:1, not 4:2:2
DVCProHD is available in both 720p and 1080i variants, the PAL 1080i being different to the NTSC 1080i, and all don't have the very same compression ratios.
You can't put DV/HDV together - they use the same tape, but that's about it. You need to put HDV on a few seperate lines for it's different varieties.
PAL DVCPro is 4:1:1 (not mentioned)
HDV is not 4:1:1 in any of it's incarnations.
Hope that helps fill in some of the gaps. I'd recommend Charles Poynton's excellent book: http://www.poynton.com/DVAI/index.html for anyone interested in the fine details about video formats.
Graeme
- www.nattress.com - Film Effects and Standards Conversion for FCP
