Insane Bitrates On Both Pirates Films!!

[phloyd]

Originally Posted by Razter

The BD spec say 40Mbps for video, that's why this is interesting. Does something allow for peaks higher than 40Mbps or is the bitrate meter simply just inaccurate on PS3?

I have often wondered that myself.

From what I can see, it is really not possible for the mux (total bitrate of everything) to go over 48 Mbps.

However... if there is a buffer that can store up video that is then 'released' at a huge bitrate, the 48Mbps need not apply. That said, I would expect most authoring tools to limit video to 40 Mbps...

But you never know.

So my theory is that the PS3 meter is not particularly accurate - at least until I see evidence to refute that and support the buffer concept.

It is also not clear over what time range the 40 Mbps limit applies (ie, you could have a big spike and then a lower bitrate for most of the 'sampling time' and still manage a 40 Mbps average for that period of time)...

Anyways, until we can mess with the actual streams, it is difficult to know for sure...

[Zaphod]

Originally Posted by phloyd

So my theory is that the PS3 meter is not particularly accurate - at least until I see evidence to refute that and support the buffer concept.

Has there been anyone, or seen anything, that has compared the PS3 bitrate and another players, or by using a Blu-ray drive on a PC side by side for bitrate comparison?

[NutsAboutPS3]

Originally Posted by phloyd

However... if there is a buffer that can store up video that is then 'released' at a huge bitrate, the 48Mbps need not apply.

Yes, the whole point of a buffer is that there can be a difference between the input and output rates. The amount of data contained in the buffer will shrink or expand depending on which rate is higher. A higher output rate can only be sustained for so long before the buffer is emptied. The Blu-ray spec will state what buffer size is required, and what input rate the disc reading hardware must be capable of sustaining. I would expect there to also be some constraints on the output rate in the specification. Encoding software can be programmed to allow the output rate to be transiently higher than the sustainable input rate, knowing how much latitude it has before the buffer is emptied.

[Rio]

Right. BD spec allows to have maximum 40Mbps input rate for video ES only, 48Mbps input rate for combined all of them (this is TS rate, not the combination of bit rate of all ESs). In the POTC case, due to the 24bit audio and additional audio tracks being there, the video peak rate (actually, this is maximum input rate) must be less than 40Mbps, although instantaneous bit rate that PS3 shows can surpass much further due to the fairly big AVC decoding buffer.

[donricouga]

http://en.wikipedia.org/wiki/Blu-ray

Raw Data Transfer max rate is 53.95 Mbits/s
Audio+Video maxes out at 48.0 Mbit/s
Video has a max of 40.0 Mbit/s

[Tekman]

This from pioneer's site
http://www.pioneerelectronics.com/pn...136015,00.html


And since we're making comparisons, let's talk about bit rate. With video that's been compressed, higher bit rates help eliminate artifacts and "noise" in moving images. So the action is cleaner, crisper and more realistic. Standard DVDs deliver a bit rate of up to 10 Mbps. The HDTV broadcasts you have come to love on your flat panel screen can reach up to an impressive 19 Mbps.
Blu-ray Discs positively scream at up to 48 Mbps! That's nearly five times the bit rate of the DVDs you're used to, and it greatly exceeds the bit rate of broadcast HDTV. No matter what you're watching, it will probably look better on a Blu-ray Disc.

[Tekman]

http://au.playstation.com/ps3/hw/bluray.jhtml

Maximum Bit Rate
With the overwhelming computational power of its Cell Broadband Engine processor, PLAYSTATION®3 is capable of playing back with ease content from BD at a bit rate of multiplex 48Mbps, the maximum bit rate defined in BD standards

[McBain]

http://www.emedialive.com/articles/r...leid=11397#iif