[Isaac Brillant]

I’ve read that the bit rate decreases from 24 mb/s to 7 mb/s when you transcode from AVCHD to ProRes. Is this true? And if it is true, does this result in loss of quality?

Another question – Lets say I transcode to Prores or to Cineform– and after completing the project I archive and backup the original small AVCHD and trash the larger unused Prores files…

If at a later point I want to reconnect to some of the offline (now trashed) prores clips, can I re-transcode the AVCHD clips to Prores, and will it have the same timecode and name as it had the first time around?

Thanks!

Isaac

[Isaac Brillant]

Thank you both.

[Isaac Brillant]

Thanks Jeff, for the helpful info. I hadn’t thought too much about the back-end issue of output and editing. I had assumed I’d transcode the AVCHD to something FCP can work with, but that may be a pain.

So, as far as image quality goes, do you think that having 4:2:2 color space, and having a higher data rate of 50mb/s vs 24 mb/s contributes more to the quality of the image than the extra resolution?

I wonder if you took a 720 x 960 HVX image and enlarged to 1080 x 1920 and compared it side by side with HMC150’s 1080, what it would look like. I’ve looked for comparison pics online, but these images are already compressed for the web so it doesn’t help much.

Also, regarding the HMC150 “pixel shift” you mentioned, does that mean than 1080 x 1920 on the HMC isn’t “really” 1080?

I don’t totally understand how the resolution works with these cameras, but I read somewhere that each chip on HMC150 is 960 x 540 pix, and that this “amounts to a resolution of about 1440 x 810.”

This sort of confused me. Because then it seems like I’m really comparing 960 x 720 vs 1440 x 810, rather than 1920 x 1080, which is a much smaller difference.

Thanks very much
Isaac

PS – While we’re talking resolution, why are some of these cameras 1080 x 1440 (like my Canon XHA1s) and some are 1080 x 1920 (like the HMC150)? They both look like the same aspect ratio so how does that work out? Thanks again Jeff

[Isaac Brillant]

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