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by omenie
Tue Feb 14, 2017 9:41 am
Forum: Graphics, sound and multimedia
Topic: Screen recording on Pi
Replies: 15
Views: 10554

Re: Screen recording on Pi

It's not the most straightforward programming exercise, effectively boiling down to the work I did to support Minecraft over RealVNC last year - you need to collapse / composite the frame buffers into a single buffer then pass that into an encoder. For RealVNC that was a frame by frame JPG encoder b...
by omenie
Sun Jan 29, 2017 6:08 pm
Forum: Graphics, sound and multimedia
Topic: Tracktion - professional DAW and interface hardware
Replies: 8
Views: 3595

Re: Tracktion - professional DAW and interface hardware

8 out 6 in is overkill for my needs, but 8 in 2 out would be AWESOME for tracking and production. Fancy another KickStarter?!
by omenie
Mon Jan 23, 2017 10:01 am
Forum: Graphics, sound and multimedia
Topic: Tracktion - professional DAW and interface hardware
Replies: 8
Views: 3595

Re: Tracktion - professional DAW and interface hardware

TBH anything over USB - it's all dependent on how the Linux filesystem is implemented deep down in its bones, and I know nowt about that. The critical thing is, if the number of active pages/sectors/whatever that need to be kept open in RAM exceeds an internal implementation-defined limit you'll see...
by omenie
Sun Jan 22, 2017 8:28 pm
Forum: Graphics, sound and multimedia
Topic: Tracktion - professional DAW and interface hardware
Replies: 8
Views: 3595

Re: Tracktion - professional DAW and interface hardware

Re. USB drive - not so sure about that as an improvement. The nastiness with a DAW is you have a very large number of widely-scattered read points and write points to the filing system, in my current case 8 or 16 write points and up to 96 read points (tracks), so depending on how the file system is ...
by omenie
Sun Jan 22, 2017 7:23 pm
Forum: Graphics, sound and multimedia
Topic: Tracktion - professional DAW and interface hardware
Replies: 8
Views: 3595

Re: Tracktion - professional DAW and interface hardware

I have a DAW engine Ive written that can sustain well over 72 tracks of playback. RAM isn't the limit here, SD read/write speed is. So their quoted 32 is a bit lower than expected but still enough for somebody to make the equivalent of Sgt Pepper, Who's Next or Led Zep IV!! Very excited about this. ...
by omenie
Sun Jan 22, 2017 2:10 pm
Forum: Graphics, sound and multimedia
Topic: Tracktion - professional DAW and interface hardware
Replies: 8
Views: 3595

Tracktion - professional DAW and interface hardware

Announcement at NAMM 2017 that Tracktion will be creating interface hardware and making their DAW available on Pi 3 - http://www.sonicstate.com/news/2017/01/ ... udio-apps/
by omenie
Mon May 23, 2016 1:39 pm
Forum: Troubleshooting
Topic: Pi Display - can I completely display the HDMI?
Replies: 1
Views: 386

Re: Pi Display - can I completely display the HDMI?

Or even 'disable the HDMI display' - extreme finger blindness today
by omenie
Mon May 23, 2016 1:35 pm
Forum: Troubleshooting
Topic: Pi Display - can I completely display the HDMI?
Replies: 1
Views: 386

Pi Display - can I completely display the HDMI?

When I run using the Pi display (the official 7" thing) I see significantly worse performance than when using just HDMI. The only conclusion I can draw is that the HDMI subsystem is still burning memory cycles fetching and compositing the framebuffer - can anyone confirm or deny this, and indicate i...
by omenie
Mon Mar 07, 2016 9:17 am
Forum: Picademy
Topic: VNC instructions (Pi remote desktop)
Replies: 27
Views: 67371

Re: VNC instructions (Pi remote desktop)

The new 'Minecraft over VNC' build is IMMENSE!
by omenie
Sun Jan 10, 2016 12:45 pm
Forum: Troubleshooting
Topic: Disable video refresh for HDMI / composite?
Replies: 4
Views: 751

Re: Disable video refresh for HDMI / composite?

Working, and happy to connect the additional cables between Model B+ and display board - I don't like micro USB for power so am more than happy to remove one of them. The biggest problem was PSU - I had an Apple 10W charger which seems to only be 5.0v unloaded, using a newer 12W 5.2v plus fat wires ...
by omenie
Sat Jan 09, 2016 11:48 pm
Forum: Troubleshooting
Topic: Disable video refresh for HDMI / composite?
Replies: 4
Views: 751

Re: Disable video refresh for HDMI / composite?

Thanks for this. At least I now know this isn't the problem - I just read on another forum post that undervolt warnings cause the Pi to drop out of turbo mode, which is what's killing me. I need to improve my power supply situation and get 5v into the Pi over all those GPIO pins rather than the micr...
by omenie
Fri Jan 08, 2016 6:19 pm
Forum: Troubleshooting
Topic: Disable video refresh for HDMI / composite?
Replies: 4
Views: 751

Disable video refresh for HDMI / composite?

Hi all I am seeing a dramatic performance hit when using the Pi display. Same SD card, plug into a Pi Zero at HDMI 1080p, runs fine. Plug into a B+ with a Pi display, big slug. I am assuming is due to the HDMI continuing to read framebuffers - any idea how I can turn this off to be sure? cheers Phil
by omenie
Sun Jan 03, 2016 5:47 pm
Forum: Troubleshooting
Topic: Kernel Oops - anyone able to advise me?
Replies: 0
Views: 411

Kernel Oops - anyone able to advise me?

Hi all - this keeps happening after running my synths for about 2 days - not the same Oops every time, but it does Oops. I have no clue how to work out what is happening, if anyone can advise in any way it would be appreciated. Message from [email protected] at Jan 3 15:55:08 ... kernel:[77287.070...
by omenie
Sun May 24, 2015 3:49 pm
Forum: Other projects
Topic: Raspberry Pi based Synthesizer
Replies: 56
Views: 26368

Re: Raspberry Pi based Synthesizer

It's neither open-sourced nor ready to release. I'd love to take a look at what you've done but I fear I won't ever have the time!! But if you are getting 20+ notes of polyphony out of a Pi 1 you are getting something right, it is challenging to squeeze that level of performance out of these things....
by omenie
Fri May 22, 2015 6:52 pm
Forum: Other projects
Topic: Raspberry Pi based Synthesizer
Replies: 56
Views: 26368

Re: Raspberry Pi based Synthesizer

Rolling your own is absolutely the only way. The last time I measured I got some 50 notes of polyphony, 2 layers per note (e.g piano plus strings) on a Pi model A with my sample replay engine.
by omenie
Thu Oct 09, 2014 7:40 pm
Forum: Graphics, sound and multimedia
Topic: Using the Pi to build a hardware synthesizer
Replies: 12
Views: 7311

Re: Using the Pi to build a hardware synthesizer

That FM demo on SoundCloud sounds bloody brilliant!!! Here's a couple of recent PIANA demos as it gets closer to being shippable. 'Closer' is a relative term, obviously ... First a Human League tune with giant handclaps : https://soundcloud.com/pisynth/being-boiled-on-a-raspberry-pi-first-test Secon...
by omenie
Thu Aug 28, 2014 4:12 pm
Forum: Bare metal, Assembly language
Topic: VFP issues with denormal numbers
Replies: 25
Views: 5425

Re: VFP issues with denormal numbers

These 2 lines of assembly code are a life saver and should be shouted from the rooftops. I've just gone from, at 950MHz, my test sequence rendering at 39k samples/sec and hence failing to meet ALSA deadlines up to 120k samples/sec as I hit 'stop' and it all just becomes reverb tails. Huge, huge diff...
by omenie
Thu Aug 28, 2014 3:28 pm
Forum: Bare metal, Assembly language
Topic: VFP issues with denormal numbers
Replies: 25
Views: 5425

Re: VFP issues with denormal numbers

are there any interactions with "try to make it go fast" settings I have got turned on, like -mfpu=vfp -mfloat-abi=hard -ffast-math -ftree-vectorize? I will try dropping this in and turn off all my 'manually catch denormals' to see what happens. And thanks in advance for the snippet.
by omenie
Thu Aug 28, 2014 3:00 pm
Forum: Bare metal, Assembly language
Topic: VFP issues with denormal numbers
Replies: 25
Views: 5425

Re: VFP issues with denormal numbers

Ijust found this post related to a problem I'm having. I'm apparently gettign denormals generated (my code does a lot of IIRs and these things will happen) and when it happens performance plummets - can anyone advise on how to get g++ to put the device into a mode where denormals are treated as zero...
by omenie
Thu Aug 28, 2014 2:48 pm
Forum: C/C++
Topic: g++ compiler settings to force denorms to zero?
Replies: 0
Views: 425

g++ compiler settings to force denorms to zero?

Hi all - I have ongoing performance weirdness around denormalized numbers, and cannot get the compiler to fix them for me - is there a known, tested set of g++ switches that will force denorms to zero. I'm geeting denorms in a variety of places - IIR filters, oscillator code - and would like to just...
by omenie
Thu Apr 17, 2014 8:22 am
Forum: Compute Module
Topic: Raspberry Pi Compute Module or RASPICOM 3D model
Replies: 21
Views: 8086

Re: Raspberry Pi Compute Module or RASPICOM 3D model

In which case my mistake, I believed the Collada format encapsulated texture images, it must be picking it up from the current directory. collada and 1024x1024 texture are here - https://www.dropbox.com/sh/6tu6bc5g7kg5e3y/GE08ENsh_D Looped video here - http://www.youtube.com/watch?v=5DaEoK6rhKg Re. ...
by omenie
Wed Apr 16, 2014 12:47 pm
Forum: Compute Module
Topic: Raspberry Pi Compute Module or RASPICOM 3D model
Replies: 21
Views: 8086

Re: Raspberry Pi Compute Module or RASPICOM 3D model

The texture is embedded in the model as it's a .dae, should just work. Failing that I can drop the .png onto the same dropbox but you may then need to remap, if texcoords have been lost. Which will be a PITA ... and yes, eliminate MIDI PHY by using UART as broadcast medium. MIDI is 31250. Hence 3 1/...
by omenie
Mon Apr 14, 2014 8:39 pm
Forum: Compute Module
Topic: Raspberry Pi Compute Module or RASPICOM 3D model
Replies: 21
Views: 8086

Re: Raspberry Pi Compute Module or RASPICOM 3D model

It's the Raspberry Pi Chamber Orchestra 'Player' - it's the thing that does synthesis. The 'Conductor' squirts MIDI to the Players, so they can synthesize. The 'Player' is nothing more than a MIDI interface to serial, and my latest even more cut down version of the RPCO eliminates MIDI from the equa...
by omenie
Mon Apr 14, 2014 3:01 pm
Forum: Compute Module
Topic: Raspberry Pi Compute Module or RASPICOM 3D model
Replies: 21
Views: 8086

Re: Raspberry Pi Compute Module or RASPICOM 3D model

Adafruit's Flickr account has very high-res images, CC license.
by omenie
Sat Apr 12, 2014 9:03 pm
Forum: Compute Module
Topic: Raspberry Pi Compute Module or RASPICOM 3D model
Replies: 21
Views: 8086

Re: Raspberry Pi Compute Module or RASPICOM 3D model

Never heard of Mac 3D Cheetah until today, looks good! I was looking for a scripted solution to explore design space. What works for me is: OpenSCAD -> OFF file -> FreeCAD Makes usable 3D CAD models that can be inspected in FreeCAD. But 3D Cheetah rocks when you make these spinning demos. Can it re...

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