gmane.comp.python.visionegg.general

Re: making quicktime movie

Jeff Zemla — 2013-05-04T03:01:08

Shih-Yu,

As far as I know there is no way to directly export your stimuli to a
quicktime movie. However, you can export each frame to an image using
p.export_movie_go(), and then reconstruct a movie from those frames using
your preferred software (e.g. Quicktime Pro).

VisionEgg comes with two files in the demos folder, makeMovie.py and
makeMovie2.py, which explain how to export frames using two different
methods. Good luck!

Jeff


On Fri, May 3, 2013 at 8:02 PM, Shih-Yu Lo <shlo9320-5LoHqUB+xBMG14wTxYosr4dd74u8MsAO< at >public.gmane.org>wrote:

making quicktime movie

Shih-Yu Lo — 2013-05-04T01:02:37

Hi all,

I want to make my experiment stimuli into a QuickTime movie. How should I do? Does anyone have any sample codes? Thanks!

Shih-Yu

Re: Linux VisionEgg

Andrew Straw — 2012-12-06T10:32:47

Hi Angelique,

This sounds like on Windows you're doing vsync, whereas in Linux you're 
not. VE can attempt to set this itself ("attempt vsync" checkbox in the 
startup dialog), but it's often a preference you set in the graphics 
drivers. The graphics drivers preferences window often has a system-wide 
default and a per-application override.

Best regards,
Andrew

On 12/06/2012 03:56 AM, Angelique Paulk wrote:

Linux VisionEgg

Angelique Paulk — 2012-12-06T02:56:27

Hi, All,
I had a strange question.  We are using VisonEgg on a Linux Ubuntu 11 as
well as on other Windows platforms.  We notice that VisionEgg is updating
per frame at 714 Hz on the Linux box, but is at the pre-set OpenGL settings
(200 Hz) on Windows.  Is there something different with how OpenGL
interfaces with VisionEgg on Linux?
Thank you,
Angelique Paulk

quicktime.py

Eamon Caddigan — 2012-10-22T00:22:25

Hi all,

I'm having trouble playing quicktime files in VisionEgg. Playback is
choppy (even though the machine is quite capable (16 GB of RAM and a
solid-state disk), and the video is not rendering correctly -- the
image is skewed.

Details:
Windows 7, 64-bit
Python 2.7.3 (32-bit version)
Pygame 1.9.2a0 (32-bit)
visionegg 1.2.1
Quicktime 7.7.2

Example file: https://www.dropbox.com/s/kvvkxxodo8ox8q0/test.mp4

Has anybody seen this?

Thanks,
Eamon
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Re: Ubuntu

Andrew Straw — 2012-07-13T13:37:36

It is certainly possible to set a 2nd display to > 75Hz in Ubuntu 12.04

Re: Ubuntu

Andrew Straw — 2012-07-13T07:38:32

Dear Yan-Qiong,

The "nvidia-settings" program should let you adjust the frame rate of 
your display. See the attached image. I had to also select my monitor 
resolution to allow me to set this.

For issue #2, I think this is the same problem as described here: SDL 
1.2 meets Gnome 3 
<http://frozenbyte.com/board/viewtopic.php?f=17&t=4229>. My suggestion 
is not to open VE programs in fullscreen mode but rather use a window 
the size of the display and set the "No frame around window" option.

Best regards,
Andrew

On 07/12/2012 12:59 PM, Yanqiong Zhou wrote:

Re: SinGrating2D function

Andrew Straw — 2012-04-16T05:36:26

Yes, but set it much more than 1, e.g. 1e6.

On 16-Apr-12 06:32, Shih-Yu Lo wrote:

SinGrating2D function

Shih-Yu Lo — 2012-04-16T05:32:27

Hi all,

In the SinGrating2D fuction, if I set the contrast parameter more than 1, then the grating becomes a square wave. Is it true?

Re: specifying screen to run visionegg

Floris van Breugel — 2012-03-22T01:05:06

Nevermind.. figured it out. Perhaps this can/should be added to the FAQ
section?

To specify the screen on which VisionEgg should run the display run a
script like this:
DISPLAY=:0.1 ./your_vision_egg_script.py

Where the 0.1 corresponds to the graphics card unit and screen (0 and 1)
respectively. On Ubuntu these numbers can be found in /etc/X11/xorg.conf.

- Floris




On Wed, Mar 21, 2012 at 1:48 PM, Floris van Breugel <floris-7GExONQZ6ZKVc3sceRu5cw< at >public.gmane.org>wrote:

specifying screen to run visionegg

Floris van Breugel — 2012-03-21T20:48:01

Hi all,

If I have multiple monitors and/or projectors, how can I specify in the
visionegg script which projector I want to run the display on?

Thanks!

- Floris

VisionEgg Error: Index out of bounds?

Paul Dick — 2012-02-28T18:13:14

Re: EEG triggers

John Christie — 2011-10-27T20:42:24

I'd say the latency is OK, but it's very consistent and can be easily subtracted… about 3ms if I remember correctly.

On 2011-10-27, at 1:46 PM, Dav Clark wrote:


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Re: EEG triggers

Dav Clark — 2011-10-27T16:46:41

That lib depends on another parallel port lib being installed. I'm unaware of a working one for mac. See the code snippet I've copied from DaqLPT.py below...

You might consider ditching the parallel port and using a lab-jack:

http://labjack.com/

They have great python drivers and the hardware is very low-latency. You can get a simple parallel port adapter with screw terminals, or you can solder your own connector.

Note also - LPT support on recent windows installs is painful and (in my experience) simply doesn't work. So, I'd say your best bet would be a linux box if you're committed to a true LPT port.

Dav

This is the import code for a parallel driver, note one URL points you to geocities! Is it spam or is it bad web design? You be the judge!

if sys.platform == 'win32':
    try:
        # Dincer Aydin's module http://www.geocities.com/dinceraydin
        import winioport as raw_lpt_module
    except ImportError:
        # Andrew Straw's module http://www.its.caltech.edu/~astraw/coding.html
        im

EEG triggers

tl a — 2011-10-27T14:55:55

Dear Andrew



Im was wondering how I can use VisionEgg to send triggers to 'Neuroscan' (EEG machine - though parallel port). Going by your suggestion in previous posts (from 2003!) I tried importing raw_lpt_module from VisionEgg.DaqLPT but i get a 'module doesn't exist' error. Has this been changed/updated in Vision Egg 1.2.1? I have installed all the dependencies listed on the vision egg website - I'm using python version 2.6.7 on a Mac OS X 10.7.2. 

looking forward to your response.    
Thanks
Tara
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Re: Recording frame times

Jens Peter Lindemann — 2011-09-15T08:40:08

Hi Kit,


it might be redundant to code inside visionegg, but you can use a 
function controller to collect the frame timestamps. See the attached 
code example which prints the timestamps of all frames presented.

Best,
   Jens.

Re: Recording frame times

Dav Clark — 2011-09-14T14:55:19

Check out VisionEgg.Core.FrameTimer

The VisionEgg.FlowControl.Presentation class already uses this. Essentially, you instantiate it, then every time you return from swap_buffers, you do a FrameTimer.tick() call. This class is the one that prints the ascii histogram at the end of the experiment, so you can use that method and a few other helpful ones.

If you are using the VisionEgg.FlowControl.Presentation class with collect_timing_info = True (the default), this is being done for you inside that class (it's what prints the histogram), but unfortunately, the variable is not exposed as a class member. You could change all instances of frame_timer to self.frame_timer in the go() method, and then grab that off your presentation class in the end, but that's a messy solution for staying up to date with Andrew's code.

Cheers,
Dav

On Sep 14, 2011, at 4:00 AM, Longden, Kit wrote:


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Recording frame times

Longden, Kit — 2011-09-14T11:00:50

Hi,
 
I'd like to save the frame times during my code. Would anyone be so kind as to show me the lines I should add to the grating.py demo code (below) to make this happen? I'd be very grateful. 

Apologies for such an obvious question, it remains unclear to me after checking the archives and documentation, no doubt because of my lack of Python.

Many thanks,
 
Kit
 
****************************

Kit Longden
The Krapp Lab: Insect vision, sensory
integration, motor control and robotics.
Contact: kit-AQ/gCgVxFfnQzY9nttDBhA< at >public.gmane.org, +44 20759 40717 
http://www3.imperial.ac.uk/people/c.longden <http://www3.imperial.ac.uk/people/c.longden> 
Address: Dr Kit Longden, Department of Bioengineering,
Imperial College London, South Kensington campus, London, SW7 2AZ, U.K.

****************************

#!/usr/bin/env python
"""Sinusoidal grating calculated in realtime."""

############################
#  Import various modules  #
############################

import VisionEgg
VisionEgg.start_default_logging();

Re: Another Snow Leopard install question

Geoff Brookshire — 2011-08-18T13:20:09

Wonderful, thanks a lot for your help! It seems to work now. For
future reference:

Now I know that pygame and OpenGL work fine on this machine (at least
for two simple games I found online that use both), despite the
cryptic error.

And adding
VisionEgg.config.VISIONEGG_GUI_INIT = 0
VisionEgg.config.VISIONEGG_GUI_ON_ERROR = 0

right after the "import VisionEgg" seemed to do the trick and get my
old vision egg scripts to run. Now to add extra config options for
full screen, etc...



And as long as we're at it, since I am a newbie and couldn't figure
out how to use macports very productively (and expect that other
people might run into the same issues), could someone post some of the
actual commands that are necessary? I managed to find "port install
py26-game", but this was unintuitive in regards to the version
selection. Maybe we could compile a step-by-step for ignorant folks
such as myself.

Thanks!!!
Geoff

On Thu, Aug 18, 2011 at 2:26 AM, Andrew Straw <andrew.straw-zMExZBaviuNeoWH0uzbU5w< at >public.gmane.o

Re: Another Snow Leopard install question

Andrew Straw — 2011-08-18T06:26:11

Dear Geoff,

I think Tomas sent some good advice, to which the only bit I'd add is 
that normal pygame programs may run fine, but most of them don't use 
OpenGL. For isolation and understanding of the problem, it would be 
useful to know if programs that use OpenGL and pygame work on your setup.

-Andrew

On 08/17/2011 09:11 PM, Geoff Brookshire wrote:

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Re: Another Snow Leopard install question

Tomas Knapen — 2011-08-17T22:32:27

Hi Geoff,

my VisionEgg installation was went as follows, and perhaps this information adds something useful.  
Used MacPorts for every dependency of VisionEgg, working from python 2.6 and haven't tried to supplement this with anything from a non-macports source for as far as I can remember off the top of my head.  
At VisionEgg install I got the same _gl_qt error messages you cite, but since they don't impair my visionegg installation (at least for the functionality I use) I've just left it at that. Install finished successfully.
The tk problem I also had, but I didn't try to fix it. My workaround is to put a 'never invoke gui' set of lines in the VisionEgg.cfg file my experiments use, i.e.
VISIONEGG_GUI_INIT = 0
VISIONEGG_GUI_ON_ERROR = 0
I think that's all. You can set all those settings programmatically in your script which is my preferred approach of setting things up anyway.  
Also, I have an installation of the eyelink pylink library, working on 64bit Snow Leopard and macports. All demos that don't ne