EX1 capture bit rate quandary

MH_Stevens wrote on 12/31/2007, 7:24 PM

Another EX1 related question. At its best setting the EX1 records MPEG-2 Long GOP[br}HQ mode: VBR, with a maximum bit rate of 35 Mb/s per the Sony specs, yet 8-bit 1920x1080@24fps is 95 Mb/s. How are these two numbers reconciled?

Mike

Comments

tumbleweed2 wrote on 12/31/2007, 8:05 PM

the 95Mb's, is "uncompressed".

MH_Stevens wrote on 12/31/2007, 8:14 PM

So what is "lost" in the cameras compression that Vegas can't get back?

farss wrote on 12/31/2007, 9:53 PM

Hopefully nothing :)

Really depends on the amount of difference between frames as it does for any mpeg-2 encoding system. It's not a question fo what Vegas cannor get back it's a question of what the encoder looses to fit it into the available bandwith. If all you're shooting is a static scene and there's no noise from the imagers then you can encode that into a very tiny amount of bandwidth.

Keep in mind if you're shooting 24fps you don't want too much full frame motion anyway for other reasons.

Bob.

Serena wrote on 1/1/2008, 7:52 PM

Actually the uncompressed rate is higher than that; a factor of 3. It's 8 bit per channel (RGB). HDV is compressed 25x.