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July 26th, 2010, 11:47 AM | #16 |
Major Player
Join Date: Feb 2007
Location: London UK
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Nigel
No doubt the resolution is "not as good as i think", but with the L - glass it looks like a very expensive set up to me, and other's i've shown it to. That's more than good enough for me. |
July 26th, 2010, 11:47 AM | #17 | ||
Inner Circle
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Quote:
Quote:
In practice, that's not true for two reasons. Firstly, the luminance channel is allocated a higher relative bitrate than chroma, and secondly doubling the number of chrominance pixels doesn't even need the chrominance bitrate to be doubled. It's possible to interpolate the extra chroma pixels from the 4:2:0 ones to a reasonable accuracy - the extra bitrate is then only needed to correct the interpolation, not define the samples from scratch. So of the 15Mb difference between the two codecs, a lot less than the 12 Mbs that simple theory would suggest is actually needed to give 4:2:2 - the rest is available for general compression improvements. |
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July 26th, 2010, 12:17 PM | #18 |
Inner Circle
Join Date: May 2005
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That's not compressed using MPEG, therefore it has better quality. China Central Television shot exclusively on HDCAM back in 2005-2006 and it's all been accepted into the BBC Motion Gallery.
In the BBC's mind, P and B frames are the enemy. GOPs are the enemy. Low-bitrate Intra frame only is simply unacceptable, but single digit to 1 compression ratios are absolutely fine. |
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