Bitrate Limit for BD9?

[wulf109]

Is there a bitrate limit putting BR content on a BD9? I remember that DVD content on a CDR topped out around 5500.

[edDV]

Is there a bitrate limit putting BR content on a BD9? I remember that DVD content on a CDR topped out around 5500.

BD9 usually refers to pressed DVD media if I recall. "AVCHD disc" is similar but uses a simplified folder structure and DVDR single or dual layer writable media.

For either, the disc must spin faster than BD media. AVCHD discs were originally specified with 17 Mbps max data rate which spun the disc ~2x for playback. Many recent Blu-Ray players can play up to 24 Mbps ~3x speed and some can reach 25 Mbps (e.g. HDV camcorder video) but there seems to be a wall above 25 Mbps for most players. For example many are having difficulty playing Panasonic's 60p camcorder format at 28 Mbps even those players that can play 60p at 24 Mbps.

For BD media, top rates are between 35 and 50 Mbps.

[Cornucopia]

The Max official allowable bitrates for BD-ROM (and by association, BD-R & BD-RE) are:

1. (2D) 40Mbps video, 48Mbps video+audio+subs/pictures
2. (3D) 40Mbps video base view, 40Mpbs video dependent view, 60Mbps video base+dependent views, 64Mbps all video+audio+subs/pictures

The Max official allowable bitrates for AVCHD are:

1. (BD media) ~24Mbps v+a+sub/pic
2. (DVD media) ~18Mbps v+a+sub/pic (this is supposed to also equal BD-9 spec)

and the new Max AVCHD/3D and AVCHD/60p rates are:
~28Mbps v+a+sub/pic (only BD media is supported)

As you can see, BD/AVCHD titles on DVD media are more limited by the spin/transfer capability of the DVD playback chain than by the spec's limits, so it often depends on the brand/quality of the playback equipment. Realistically speaking, you should set the target bitrate to fall in the 1/4 to 1/3 (possibly/occasionally 1/2) compared to BD rates.

Scott

[edDV]

The Max official allowable bitrates for AVCHD are:

1. (BD media) ~24Mbps v+a+sub/pic
2. (DVD media) ~18Mbps v+a+sub/pic (this is supposed to also equal BD-9 spec)

and the new Max AVCHD/3D and AVCHD/60p rates are:
~28Mbps v+a+sub/pic (only BD media is supported)

Where are you finding the "AVCHD" and "new Max AVCHD/3D and AVCHD/60p" specs? I've been looking. I did find an original "AVCHD disc" spec but nothing later. Most of my stated bit rates are from empirical tests on a few players. It seems a shame the Blu-Ray player test pundits don't test for these specs.

[Cornucopia]

Actually, (and surprisingly)) straight from the horse's mouth.

AVCHD-INFO

On the page "AVCHD Specification Format Overview" it shows the v1.0 specs, but recently added underneath that table is a 2nd table which shows the (v2.0) 1080Progressive/Stereoscopic specs.

BTW, I'm inferring that bit about not supporting DVD media based on the fact that in the v1 table they specifically mention support for it but in the v2 table don't mention it. Plus, I have read in other documents that the BD Association wants to use those (along with Web connectivity, BD-J enhanced interactivity) "features" as means to demonstrate the difference in functionality between BD and DVD (to further entice people away from DVD). Maybe to them it's their "killer app".

Scott