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by vadim
Tue Nov 12, 2013 11:29 am
Forum: Graphics, sound and multimedia
Topic: USB soundcards that work in PD?
Replies: 7
Views: 1492

Re: USB soundcards that work in PD?

I bet you will be disappointed by the latency you will get with USB and non-accelerated processing. Definitely not for live performance.
by vadim
Mon Nov 11, 2013 10:13 pm
Forum: Graphics, sound and multimedia
Topic: using an electret mic
Replies: 15
Views: 9033

Re: using an electret mic

I'm not even talking about an official codec. PCM interface is not even defined in bcm2708 platform in the official Linux kernel. I've helped several users to get I2S working using an experimental kernel (just check who's been recently responding to questions and requests for help in that forum topi...
by vadim
Mon Nov 11, 2013 7:37 pm
Forum: Graphics, sound and multimedia
Topic: using an electret mic
Replies: 15
Views: 9033

Re: using an electret mic

Yes, but is seems quite unknown that the revision 2 boards (A&B) have a new GPIO header P5 that contains an official sound interface, (I2S). I don't think it can be called official until it is supported by the official kernel. It is not. Furthermore, there is no device tree implementation so an...
by vadim
Mon Nov 11, 2013 2:55 pm
Forum: Graphics, sound and multimedia
Topic: using an electret mic
Replies: 15
Views: 9033

Re: using an electret mic

I soldered an opamp-based preamp for an electret mic, an ADC chip and fit it all in RPi case. :) Still, I suggest just plugging an old USB webcam and record voice straight away :D
by vadim
Sun Nov 10, 2013 1:02 pm
Forum: Graphics, sound and multimedia
Topic: Stream IPTV from one RPi to another RPi
Replies: 29
Views: 13169

Re: Stream IPTV from one RPi to another RPi

yep, thanks. looks like you've got a good uplink at home.
by vadim
Fri Nov 08, 2013 3:02 pm
Forum: General programming discussion
Topic: Flash Drive as RAM
Replies: 22
Views: 7927

Re: Flash Drive as RAM

The difference between 8MP and 41MP on the same physical size of sensor is 33MP of noise :lol: Many browsers now start to load much more rubish than they most probably will present on screen. Just to claim that they are the fastest browsers. Some might agree that is an optimisation of user experienc...
by vadim
Fri Nov 08, 2013 12:06 pm
Forum: Graphics, sound and multimedia
Topic: Stream IPTV from one RPi to another RPi
Replies: 29
Views: 13169

Re: Stream IPTV from one RPi to another RPi

Ctrl+i -> Statistics (or something similar) during playback on the laptop.
by vadim
Fri Nov 08, 2013 9:42 am
Forum: Graphics, sound and multimedia
Topic: Stream IPTV from one RPi to another RPi
Replies: 29
Views: 13169

Re: Stream IPTV from one RPi to another RPi

Enjoy! You will get udp packets disappearing or delayed along the way from time to time. Thus the glitches. Actually I am still eager to know what is the ratio of dropped packets in this setup.
by vadim
Thu Nov 07, 2013 11:09 am
Forum: Graphics, sound and multimedia
Topic: Stream IPTV from one RPi to another RPi
Replies: 29
Views: 13169

Re: Stream IPTV from one RPi to another RPi

Just check the stream that comes from the provider before attempting any unaccelerated transcoding!
by vadim
Wed Nov 06, 2013 9:27 am
Forum: Graphics, sound and multimedia
Topic: Stream IPTV from one RPi to another RPi
Replies: 29
Views: 13169

Re: Stream IPTV from one RPi to another RPi

is it worse than on laptop? is Pi connected by cable or Wifi? what is the bitrate and what audio/video streams are transmitted? what is cpu load? how much memory is given to GPU? how large is buffer on vlc? how long is ping from one Pi to another?
by vadim
Tue Nov 05, 2013 4:46 pm
Forum: Troubleshooting
Topic: halt renders PNY SD card non-bootable
Replies: 12
Views: 2939

Re: halt renders PNY SD card non-bootable

I use these PNY cards on two RPi systems running Raspbian and ArchLinux. Only one problem was experienced when some network settings disappeared but I attribute that to power interruption. I don't overclock as that is the shortest path to class 10 SD card corruption :)
by vadim
Tue Nov 05, 2013 1:43 pm
Forum: Advanced users
Topic: Cheap UPS?
Replies: 22
Views: 15343

Re: Cheap UPS?

PiModules wrote:Hi,
Check the UPiS Basic or the UPiS Advanced from http://www.pimodules.com
You can buy it via distributors

Warmest Regards
PiMaster
Is it possible to modify the board so that it doesn't block the camera connector?
by vadim
Tue Nov 05, 2013 1:38 pm
Forum: Graphics, sound and multimedia
Topic: Stream IPTV from one RPi to another RPi
Replies: 29
Views: 13169

Re: Stream IPTV from one RPi to another RPi

@vadim Thanks for your reply. I dont have enough knowledge to answer any of your questions. I dont even know where to set the size of the packages to start with. Nor how to use HW acceleration. In vlc on your laptop in Media Information / Statistics you can see how many frames/audio buffers were dr...
by vadim
Tue Nov 05, 2013 1:23 pm
Forum: Graphics, sound and multimedia
Topic: Stream IPTV from one RPi to another RPi
Replies: 29
Views: 13169

Re: Stream IPTV from one RPi to another RPi

You really have to use HW acceleration.
Out of curiosity, how many packets get lost in transborder streaming and what size of packets is default in vlc?
by vadim
Mon Nov 04, 2013 6:55 pm
Forum: Graphics, sound and multimedia
Topic: Wolfson Pi Audio Card
Replies: 6
Views: 5421

Re: Wolfson Pi Audio Card

The more the merrier. As we start to see more commercial standardised products then producers and users will (hopefully) invest more in development of (more or less) universal drivers that would be included in the standard RPi kernel. Without it we have problems I outlined in https://github.com/koal...
by vadim
Mon Nov 04, 2013 1:04 pm
Forum: Graphics, sound and multimedia
Topic: Wolfson Pi Audio Card
Replies: 6
Views: 5421

Wolfson Pi Audio Card

Yay! A sound card for RPi! I hope this will bring more momentum to I2S driver development :)
http://www.element14.com/community/comm ... wolfson_pi
by vadim
Mon Nov 04, 2013 12:01 pm
Forum: Automation, sensing and robotics
Topic: Glasses for the blind
Replies: 5
Views: 2297

Re: Glasses for the blind

Try to find and watch Terra Mater series Bionic Revolution for inspiration. They discussed several devices for blind people and even enabled a blind man to ride a bike in a wood.
by vadim
Fri Nov 01, 2013 4:21 pm
Forum: Troubleshooting
Topic: Pi powers down when I complete a circuit
Replies: 16
Views: 2711

Re: Pi powers down when I complete a circuit

This behaviour will be observed even without shorting if empty capacitors (or physical elements forming a large enough capacitor) are present without current limiting resistors.
by vadim
Fri Nov 01, 2013 2:01 pm
Forum: Off topic discussion
Topic: apple cheats again!!!
Replies: 56
Views: 15377

Re: apple cheats again!!!

My bad, shouldn't have mixed apples with raspberries :lol: Now Apple is used in arguments against what I say about RasPi and RasPi is used as argument against what I've never said about Apple... The future of RasPi and its strategy should be discussed in a separate thread and Apple, its products and...
by vadim
Thu Oct 31, 2013 11:07 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: STICKY: The I2S sound thread. [I2S works]
Replies: 1001
Views: 585300

Re: I2S: Anyone got it running? (answer is yes!)

should be. I requested that he put his name and email.
by vadim
Thu Oct 31, 2013 3:59 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: STICKY: The I2S sound thread. [I2S works]
Replies: 1001
Views: 585300

Re: I2S: Anyone got it running? (answer is yes!)

@bezel Contact Francesco, the author of the drivers you're using. There is no config switching in the drivers so the user is supposed to know how everything should be connected (and that is not documented either). He should be able to advise how to connect configuration pins and supply master clock ...
by vadim
Thu Oct 31, 2013 3:32 pm
Forum: Advanced users
Topic: Next firmware tree is now 3.10
Replies: 105
Views: 41690

Re: Next firmware tree is now 3.10

YAY! :D
by vadim
Thu Oct 31, 2013 3:26 pm
Forum: Graphics, sound and multimedia
Topic: Play PCM audio file using on board gpio PWM pin
Replies: 6
Views: 3149

Re: Play PCM audio file using on board gpio PWM pin

What is it that you want to learn? PWM interface or ineffective way of producing noise? ;)
by vadim
Thu Oct 31, 2013 11:22 am
Forum: Off topic discussion
Topic: apple cheats again!!!
Replies: 56
Views: 15377

Re: apple cheats again!!!

There are many linux distros for just about any ARM based device Exactly. None of which works efficiently on at least two of popular ARM-based boards that offer development capabilities and desktop environment in one package. Tailoring GNU/Linux distributions to run efficiently on any board that co...
by vadim
Wed Oct 30, 2013 10:44 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: STICKY: The I2S sound thread. [I2S works]
Replies: 1001
Views: 585300

Re: I2S: Anyone got it running? (answer is yes!)

left justified mode doesn't change what i2s driver does, i told you so. it's still to be rewritten but so far there was not much demand for alternative formats. i wonder how you set integer variable to 32.5 :) change the code where it sets half frame from 20 to 32 because at that point driver thinks...

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