Not logged in
Log in now
Create an account
Subscribe to LWN
LWN.net Weekly Edition for May 23, 2013
An "enum" for Python 3
An unexpected perf feature
LWN.net Weekly Edition for May 16, 2013
A look at the PyPy 2.0 release
I guess I should test it again.
The Boxee Box: too free to live?
Posted Oct 20, 2012 22:28 UTC (Sat) by arekm (subscriber, #4846)
Posted Oct 21, 2012 16:41 UTC (Sun) by man_ls (subscriber, #15091)
Posted Oct 21, 2012 16:47 UTC (Sun) by arekm (subscriber, #4846)
Format : Matroska
Format version : Version 2
File size : 8.74 GiB
Duration : 1h 37mn
Overall bit rate : 12.8 Mbp
ID : 1
Format : AVC
Format/Info : Advanced Video Codec
Format profile : High@L4.1
Format settings, CABAC : Yes
Format settings, ReFrames : 5 frames
Codec ID : V_MPEG4/ISO/AVC
Duration : 1h 37mn
Bit rate : 11.3 Mbps
Width : 1 920 pixels
Height : 816 pixels
ID : 2
Format : DTS
Format/Info : Digital Theater Systems
Codec ID : A_DTS
Duration : 1h 37mn
Bit rate mode : Constant
Bit rate : 1 510 Kbps
Channel(s) : 6 channels
Channel positions : Front: L C R, Side: L R, LFE
Sampling rate : 48.0 KHz
Bit depth : 24 bits
Posted Oct 21, 2012 16:56 UTC (Sun) by GhePeU (subscriber, #56133)
Latest Raspbmc should already use hard-float, so probably you'll need to overclock, which is now officially supported: http://www.raspberrypi.org/archives/2008
Posted Oct 21, 2012 17:40 UTC (Sun) by arekm (subscriber, #4846)
I don't want to overclock pi. If I had to then it would be another reason to say that raspberry pi isn't good solution for home video player.
My popcornhour C-200 works much better (in terms of 'user experience') than xbmc on raspberry pi. The price range is very different though.
Posted Oct 21, 2012 21:28 UTC (Sun) by dlang (✭ supporter ✭, #313)
Overclocking beyond the manufacturers spec is a problem.
But the manufacturers have said that as long as the temp doesn't get too high, these clock rates are safe.
At that point, what's the difference between "overclocking" and the "turbo mode" that the latest Intel chips have where they can shut down some cores to run other cores at a higher clock rate and still keep within the thermal limits?
XBian mildly overclocks the pi in this safe, manufacturer approved way, and is significantly snappier than raspbmc.
That said, even Raspbmc is not significantly less responsive than my DVR when navigating around. I haven't tried doing so while a video is playing.
Posted Oct 21, 2012 21:35 UTC (Sun) by dlang (✭ supporter ✭, #313)
what's the difference between the two?
Posted Oct 22, 2012 18:34 UTC (Mon) by cmccabe (guest, #60281)
Overclocking is by definition not supported by the manufacturer.
I freely admit that I have not done any research on it, but just based on your comment, it sounds like the pi folks were having thermal dissipation issues at the higher frequencies. You can feel free to second-guess the engineers, but only at the risk of significant problems-- like melting the device, starting a fire, etc.
Posted Oct 22, 2012 18:48 UTC (Mon) by dlang (✭ supporter ✭, #313)
This is supported by the manufacturer
Introducing turbo mode: up to 50% more performance for free
Posted on September 19, 2012 by eben
Since launch, we’ve supported overclocking and overvolting your Raspberry Pi by editing config.txt. Overvolting provided more overclocking headroom, but voided your warranty because we were concerned it would decrease the lifetime of the SoC; we set a sticky bit inside BCM2835 to allow us to spot boards which have been overvolted.
We’ve been doing a lot of work to understand the impact of voltage and temperature on lifetime, and are now able to offer a “turbo mode”, which dynamically enables overclock and overvolt under the control of a cpufreq driver, without affecting your warranty. We are happy that the combination of only applying turbo when busy, and limiting turbo when the BCM2835′s internal temperature reaches 85°C, means there will be no measurable reduction in the lifetime of your Raspberry Pi.
You can now choose from one of five overclock presets in raspi-config, the highest of which runs the ARM at 1GHz. The level of stable overclock you can achieve will depend on your specific Pi and on the quality of your power supply; we suggest that Quake 3 is a good stress test for checking if a particular level is completely stable. If you choose too high an overclock, your Pi may fail to boot, in which case holding down the shift key during boot up will disable the overclock for that boot, allowing you to select a lower level.
What does this mean? Comparing the new image with 1GHz turbo enabled, against the previous image at 700MHz, nbench reports 52% faster on integer, 64% faster on floating point and 55% faster on memory.
Posted Oct 23, 2012 22:51 UTC (Tue) by Lennie (subscriber, #49641)
Posted Oct 22, 2012 15:35 UTC (Mon) by dashesy (subscriber, #74652)
Posted Oct 22, 2012 19:00 UTC (Mon) by dlang (✭ supporter ✭, #313)
600MHz Cortex A8 chip
Raspberry Pi $35
700-1000MHz ARM6 chip
512M ram (new version, old one was 256M)
SD card storage
are you sure the beagleboard is 'much more powerful' than the pi?
it's possible that the video acceleration of the beagleboard is better than the pi. I don't know a good way to look that up.
Posted Oct 22, 2012 19:30 UTC (Mon) by dashesy (subscriber, #74652)
Posted Oct 22, 2012 20:26 UTC (Mon) by dlang (✭ supporter ✭, #313)
Unfortunantly this does require a binary blob driver loaded by the boot process to work, but while this isn't good, it's no worse than anything else in the space.
Posted Oct 22, 2012 20:06 UTC (Mon) by GhePeU (subscriber, #56133)
1 GHz Cortex A8
512 MB LP-DDR
microSD card storage
And it still doesn't support 1080p video, at best it can do 720p.
A Pandaboard ES can play 1080p video (I've got one on my desktop now), but it costs ~180USD. It's a wholly different board, however, dual-core Cortex A9 1.2GHz with 1 GB LP-DDR2, 802.11 b/g/n, 10/100 Ethernet, Bluetooth v2.1 EDR, HDMI, DVI-D... it's also very well supported for now, the latest drivers release supports Wayland (!).
The Odroid-X is another alternative, it costs about 50 USD less than a Pandaboard (no WiFi or Bluetooth however) and has a quad-core Exynos4412 Cortex A9 1.4 GHz, but I don't think HD video acceleration is working on Linux at the moment.
Copyright © 2013, Eklektix, Inc.
Comments and public postings are copyrighted by their creators.
Linux is a registered trademark of Linus Torvalds