Blu-ray bitrate

Arthur.S wrote on 12/14/2009, 3:40 AM

Anyone know of an accurate way to work out the optimal encoding rate for say, an hour of video? Using m2v to Blu-ray. Seems like 22gig is a sensible target, leaving 3gig for the menus.

Comments

PerroneFord wrote on 12/14/2009, 9:36 AM

Google for Bit Rate Calculator. There's dozens of them out there.

Arthur.S wrote on 12/14/2009, 9:55 AM

Ok, found this one: http://dvd-hq.info/bitrate_calculator.php

It's recommending a 2 pass variable setting with an upper limit of 46150. Is there any point in that if the source material is 25 mbs m2t?

John_Cline wrote on 12/14/2009, 5:00 PM

No, there isn't much point in setting it to 46150, in fact, that's higher than the Blu-ray maximum video bitrate.* try 2-pass - max=30000 avg=25000 min=20000.

* BD discs have a maximum data transfer rate of 54 Mbit/s, a maximum AV bitrate of 48 Mbit/s (for both audio and video data), and a maximum video bitrate of 40 Mbit/s.

Arthur.S wrote on 12/15/2009, 3:56 AM

Thanks for the reply John. same question though; Is there any point in re-encoding at a much higher bitrate than the source material? Will I see any benefit?

Chienworks wrote on 12/15/2009, 5:45 AM

You'll see less loss. That's the benefit.