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by dom
Tue Jan 31, 2012 11:03 pm
Forum: General discussion
Topic: New blog post from JamesH on the main page
Replies: 56
Views: 8061

Re: New blog post from JamesH on the main page

<t>All codecs running on the GPU require significant software (even the hardware accelerated ones).<br/> We typically implement codecs as dlls (they have a .vll extension), so they can be loaded and unloaded as required. They live on the ARM file system, and we use a file daemon (vcfiled) to provide...
by dom
Tue Jan 31, 2012 8:20 pm
Forum: General discussion
Topic: New blog post from JamesH on the main page
Replies: 56
Views: 8061

Re: New blog post from JamesH on the main page

mp3 requires licensing (and is more expensive than h264), so no GPU decode.
But audio is easy enough for ARM to decode, so shouldn"t be a problem.
by dom
Tue Jan 31, 2012 8:00 pm
Forum: General discussion
Topic: Kernel Patches
Replies: 13
Views: 1978

Re: Kernel Patches

We"d love our kernel patches to be upstreamed.
None of us have experience in this, so we"re looking for community help.
by dom
Tue Jan 31, 2012 7:17 pm
Forum: General discussion
Topic: New blog post from JamesH on the main page
Replies: 56
Views: 8061

Re: New blog post from JamesH on the main page

<t>Liz could you correct the blog post?<br/> <br/> "There are non-licensed Codecs such at VP8, Xvid etc, but for the moment they will not be accelerated by the GPU."<br/> <br/> These are bad examples. Firstly VP8 is license free. Xvid is not a codec, but an implmentation of mpeg4 part2, and we suppo...
by dom
Tue Jan 31, 2012 6:23 pm
Forum: General discussion
Topic: New blog post from JamesH on the main page
Replies: 56
Views: 8061

Re: New blog post from JamesH on the main page

From wikipedia

Xvid (formerly "XviD") is a video codec library following the MPEG-4 standard, specifically MPEG-4 Part 2 Advanced Simple Profile (ASP).

Similarly for DivX.

These follow the mpeg4 standard and our mpeg4 decoder will play these happily.
by dom
Mon Jan 30, 2012 11:51 pm
Forum: General discussion
Topic: Cases and static
Replies: 11
Views: 2323

Re: Cases and static

<r>This was the cable (in fact I bought two – they were only 99p when I bought them):<br/> <br/> <URL url="http://www.ebay.co.uk/itm/ws/e.....0744534601">http://www.ebay.co.uk/itm/ws/e.....0744534601</URL><br/> <br/> Resistance of 5ohms. 5V in one end. Less than 4V out the other. R-Pi not very stabl...
by dom
Mon Jan 30, 2012 8:34 pm
Forum: General discussion
Topic: Cases and static
Replies: 11
Views: 2323

Re: Cases and static

I wouldn't be too concerned about static. I've been manhandling boards like this for years - without a wriststrap, and have never known a board to be killed by static.
by dom
Mon Jan 30, 2012 7:05 pm
Forum: General discussion
Topic: OpenGL ES extensions and limits
Replies: 14
Views: 17641

Re: OpenGL ES extensions and limits

<t>./eglinfo<br/> EGL<br/> Vendor: Broadcom<br/> Version: 1.4<br/> Client APIs: OpenGL_ES OpenVG<br/> Extensions: EGL_KHR_image EGL_KHR_image_base EGL_KHR_image_pixmap EGL_KHR_vg_parent_image EGL_KHR_gl_texture_2D_image EGL_KHR_gl_texture_cubemap_image EGL_KHR_lock_surface<br/> OpenGL ES<br/> Vendor...
by dom
Sat Jan 28, 2012 6:34 pm
Forum: General discussion
Topic: FPU flags test
Replies: 2
Views: 1501

Re: FPU flags test

<t>You are completely correct.<br/> <br/> All debian packages (including C runtime) are build with software floating point. This is very slow on software that heavily uses floating point.<br/> <br/> We have produced replacement debian C runtime libraries that are built with -mfpu=vfp. They do make s...
by dom
Fri Jan 27, 2012 6:51 pm
Forum: General discussion
Topic: Remote desktop application and use
Replies: 13
Views: 4150

Re: Remote desktop application and use

I've installed a remote desktop client on Raspberry Pi and connected to my Windows 7 PC. Seemed pretty usable.
by dom
Fri Jan 27, 2012 6:47 pm
Forum: General discussion
Topic: HDMI CEC and XBMC
Replies: 98
Views: 177218

Re: HDMI CEC and XBMC

Cool. We're quite keen to support libCEC and have bought a couple their dongles to evaluate. If they are keen too, then I guess it will happen.

For a Raspberry Pi CEC demo:



(not using libCEC)
by dom
Fri Jan 27, 2012 12:16 am
Forum: General discussion
Topic: Audio via HDMI
Replies: 11
Views: 3666

Re: Audio via HDMI

<t>That player only supports passthrough audio (due to licensing), so will only make a sound through a TV or receiver that can handle DTS or AC3.<br/> <br/> You will need to wait for third party media players (e.g. XBMC and no doubt others) that can decode audio on the ARM, and output it as PCM, whi...
by dom
Thu Jan 26, 2012 12:47 am
Forum: General discussion
Topic: Audio via HDMI
Replies: 11
Views: 3666

Re: Audio via HDMI

<t>What app are you using to output the audio?<br/> There is a demo app (ilplayer) that just supports video + passthrough audio (due to codec licensing issues). That will only output audio if your TV or receiver can decode it.<br/> There will be media players that decode audio on the ARM and output ...
by dom
Sun Jan 15, 2012 4:35 pm
Forum: General discussion
Topic: Raspberry Pi playing 1080p video and AirPlay
Replies: 13
Views: 5758

Re: Raspberry Pi playing 1080p video and AirPlay

<t>mr_molez said: <br/> <br/> <br/> I would be more interested to see videos showing how fast the pi works with the browser and whether at all they have managed to use flash or gnash. basically i would like to see how fast the pi is at doing everyday things.<br/> <br/> <br/> The videos tend to show ...
by dom
Sat Jan 14, 2012 11:25 pm
Forum: General discussion
Topic: Pal or NTSC?
Replies: 4
Views: 5092

Re: Pal or NTSC?

There"s no way of detecting whether the TV supports PAL or NTSC.
Most TVs will display a picture even if you get it wrong.
You can force PAL or NTSC in a "config.txt" file on boot partition.
by dom
Sun Jan 08, 2012 11:56 pm
Forum: General discussion
Topic: Simultaneous HDMI video and 3.5mm audio output?
Replies: 1
Views: 1096

Re: Simultaneous HDMI video and 3.5mm audio output?

HDMI with analogue audio is fine. That will be a common configuration for DVI monitor users.
by dom
Wed Jan 04, 2012 10:40 pm
Forum: General discussion
Topic: Audio and HDMI?
Replies: 9
Views: 3227

Re: Audio and HDMI?

Audio sync is a feature of the media player.

But, sure, the openMAX API we use allows an offset to be specified between audio and video to compensate for the delay in, for example, the receiver.
by dom
Wed Jan 04, 2012 10:31 pm
Forum: General discussion
Topic: R-Pi as a media player?
Replies: 40
Views: 10185

Re: R-Pi as a media player?

10 bit H.264 is not supported by us, or any hardware decoder (as far as I know).

If you need this ability, you have to go for a software decoder (e.g. a high specced PC).
by dom
Wed Jan 04, 2012 10:07 pm
Forum: General discussion
Topic: Audio and HDMI?
Replies: 9
Views: 3227

Re: Audio and HDMI?

<t>The headphone jack is stereo.<br/> <br/> Mobile phones would use an external audio codec (e.g. Wolfson), which is very high quality.<br/> <br/> Raspberry Pi uses PWM on a GPIO pin with some filtering. It's not so high quality.<br/> <br/> If you are playing through speakers built into the monitor,...
by dom
Wed Jan 04, 2012 8:35 pm
Forum: General discussion
Topic: Audio and HDMI?
Replies: 9
Views: 3227

Re: Audio and HDMI?

There is analogue audio out (headphone socket) that can be fed to an amplifier, but the quality is lower than HDMI audio.

Ideally you would want to use an AV receiver that takes audio from HDMI and feeds it to speakers.
by dom
Tue Jan 03, 2012 9:29 pm
Forum: General discussion
Topic: Can It handle Blu-ray playback ?
Replies: 42
Views: 22574

Re: Can It handle Blu-ray playback ?

<t>The GPU can decode and display main profile level 4.1 H.264 1080p30 content with ease.<br/> <br/> However that's probably not what you are asking.<br/> <br/> Keeping the GPU fed with content at 40Mbit/s is tricky. It's got to come from sdcard, USB, or network.<br/> <br/> Due to licensing issues, ...
by dom
Thu Dec 29, 2011 11:30 am
Forum: General discussion
Topic: will the pi have a proper mac address?
Replies: 2
Views: 2086

Re: will the pi have a proper mac address?

The GPU will have a unique number programmed into OTP bits.

We have a range of MAC addresses assigned. The OTP bits will deterine the specific MAC address you get.

So yes, you will have a globally unique MAC address.
by dom
Tue Dec 27, 2011 3:18 pm
Forum: Other projects
Topic: Down to the metal?
Replies: 10
Views: 2569

Re: Down to the metal?

<t>dburton said: <br/> <br/> <br/> FB access?<br/> <br/> <br/> <br/> The FB access is quite simple. You poke the address of a structure to a mailbox register. The structure defines width/height/bpp etc of framebuffer. The GPU allocates the memory and returns you the address through the mailbox.<br/>...
by dom
Wed Dec 21, 2011 12:26 am
Forum: General discussion
Topic: Which version of HDMI ?
Replies: 12
Views: 1975

Re: Which version of HDMI ?

<t>Quote from tufty on October 2, 2011, 14:19<br/> Quick question for those who might know : With an HDMI connection, is there any way of telling when a screen has been unplugged, turned off, or switched to another source? <br/> <br/> I believe all this, and more is handled through CEC. It can also ...

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