54 Mbps might be a sustained or average rate, but in real-life BDs are
exceeding that by a good margin.
If you read the wiki site you linked, it clearly says that the max data
rate for DTS-HD is 24.5 Mbps (which I rounded up in my prior post (see
below)). There are several titles that have video bit rates in excess
of 40Mbps. Just check out The Dark Knight. So these numbers are either
oldish or theoretical limits, or some kind of average rate for a title.
Or, the movie-making people are ignoring them, perhaps because they know
that most players and drives can exceed 54Mbps reading data of a drive.
You can see the rates in PowerDVD. On the Dark Knight the video data
rate is highly variable, but I've see it, iirc, jump to you 48Mbps
(check out the imax scenes). Since the audio stream on that title is
locked at 24.5 Mbps, the max is around 72.5 Mbps. If your network is
not up to par, things go bad quickly.
Many titles come in way less than that, though, so they will typical
play fine on a 100Mbps network. But if you want any and all titles to
play, you need to get up around 80Mbps or 10MB/s through-put on your
network (10MB/s or 80Mbps is a good rule of thumb). And while networks
can be rated at 100Mbps and such, we know that in the real world the
typical performance will be around 70Mbps or even less. That makes
using a 100Mbps network for streaming blu-ray very borderline.
I've tested this quite a bit, using tools like Lan Speed Test & the Dark
Knight, over wireless (both 54Mbps and 300Mbps) links, powerline links
and over my own gigabit network. I measured the throughput on my
powerline link to be around 8.7-9.2 MB/s (bytes, not bits) and it will
definitely crap out on Dark Knight. Other titles play just fine,
though. I think I have posted many of my results on this list....
On 11/6/2011 10:17 PM, Greg Sevart wrote:
Nope, 54mbit/s is the max data rate for the blu-ray spec. That's for both
audio and video combined--the video cap is 40mbit/s.
http://en.wikipedia.org/wiki/Blu-ray_Disc#Bit_rate
http://www.blu-ray.com/faq/#bluray_speed
-----Original Message-----
From: [email protected] [mailto:hardware-
[email protected]] On Behalf Of Anthony Q. Martin
Sent: Sunday, November 06, 2011 7:01 PM
To: [email protected]
Subject: Re: [H] How to stream videos on PC to TV?
I think bd max's out higher than that......more like 80mbps.....I've seen
just
video that was 50mpbs....and to that a 25mbps audio stream and you're
there. Thats why I had to run cat6, as my powerline av was just not
enough
to ensure I could stream any bd.
Sent from my iPad
