[visionegg] Re: movies BUG
- From: Mikko Vähäsöyrinki <mikko@xxxxxxxxxxx>
- To: <visionegg@xxxxxxxxxxxxx>
- Date: Tue, 25 Apr 2006 17:59:26 -0700
Hi Andrew,
Thanks for the information - it seems to work as you say. I think I'll just
get a better computer. However, I've encountered a bug that I don't know how
to fix. Part of the movie on the right side is clipped off and I couldn't
figure out why (seems to be something in the low level code). I've tried for
example "Why mac for science" movie from this website:
http://www.esm.psu.edu/Faculty/Gray/movies.html
It looks to me like one third of the movie is missing from the right when
shown with VisionEgg. Also the movie box is not really centered to the
screen even though it should (it's always at the lower part of the screen in
my system).
Cheers,
Mikko
-----Original Message-----
From: visionegg-bounce@xxxxxxxxxxxxx [mailto:visionegg-bounce@xxxxxxxxxxxxx]
On Behalf Of Andrew Straw
Sent: Tuesday, April 25, 2006 4:00 PM
To: visionegg@xxxxxxxxxxxxx
Subject: [visionegg] Re: movies
Hi Mikko,
The movies are played directly using the QuickTime API. I'm not sure
what goes on "behind the scenes", but I imagine what's happening is 99%
the same as what happens when you play something using the QuickTime
Player. The primary difference is that the movie gets rendered to a
block of memory, which the Vision Egg code then puts into an OpenGL
texture.
So, the QuickTime API will try to make the movies play at whatever
framerate is specified in the QuickTime file. If the Vision Egg draws
more frames than that, there will simply be multiple identical frames
drawn. So, if you want to accelerate the playback speed, I think you'd
need to edit the QuickTime movie file.
You should be able to determine if your system is fast enough using the
QuickTime player -- I hope the Vision Egg isn't too much less efficient
that. If you can't play movies there without dropping frames, your
computer is simply too slow. If you can play them there without dropping
frames, but frames get dropped in the Vision Egg, we'll have to see if
we can get some extra speed.
Cheers!
Andrew
Mikko Vähäsöyrinki wrote:
>Many thanks for the movie support. I have it working in my system, but I'm
>not getting high enough frame rates with my current (old) computer (I'm
>limited to around 100 Hz). I was wondering if anyone has insight into the
>hardware requirements for getting to the limits of my monitor (160Hz).
>
>Another thing I've been wondering is how fast the movies recorded with my
>standard camcoder are played in VisionEgg. Are they sped up to 160 Hz so
>that my half an hour movie will only last a fraction of that when replayed?
>I'm also a bit worried about how long movies I'll be able to play. I'm not
>sure how the VisionEgg converts the quicktime movie files into
>TextureStimulus. Are they read straight into memory, in which case the
>memory would be the limiting factor? I would like to play up to an hour
long
>movies with 160 Hz in VGA mode. Any thoughts of how this might work and
what
>kind of computer I should buy to get it running?
>
>All the help much appreciated.
>Mikko Vahasoyrinki
>
>-----Original Message-----
>From: visionegg-bounce@xxxxxxxxxxxxx
[mailto:visionegg-bounce@xxxxxxxxxxxxx]
>On Behalf Of Andrew Straw
>Sent: Monday, April 03, 2006 1:11 AM
>To: visionegg@xxxxxxxxxxxxx
>Subject: [visionegg] Re: movies
>
>Hi Mikko,
>
>I just got QuickTime movies working in Windows. I made a "Bleeding Edge"
>release for Windows users:
>https://sourceforge.net/project/showfiles.php?group_id=40846&package_id=734
7
>9
>This is also in the subversion repository.
>
>There is now an additional requirement, ctypes. (OK, there's also a
>requirement to install QuickTime on your system, but you knew that...)
>
>The old quicktime.py demo in the demos directory works unmodified on my
>system.
>
>I haven't tried my Mac with the new code and given the extent of the
>changes, I'm convinced this will break Mac support for QuickTime movies
>for the time being. However, this new code should be much more
>maintainable in the long-term.
>
>Cheers!
>Andrew
>
>Mikko Vähäsöyrinki wrote:
>
>
>
>>Hi All,
>>
>>I would like to show some movies with the visionegg, but the demos
>>aren?t working and I?m not sure how to proceed. I?m running vision egg
>>in windows 2000. Trying to run the mpeg demo gives an error message of
>>missing module. Based on google it looks like the pygame.movie does
>>not come with the latest pygame and it?s not necessarily even
>>compatible with it. I also had a look at the quicktime option, but it
>>looks like it?s only for the mac at the moment.
>>
>>All the help would be greatly appreciated.
>>
>>Cheer,
>>
>>Mikko
>>
>>Dr. Mikko Vähäsöyrinki
>>
>>California Institute of Technology
>>
>>Division of Biology, MC 139-74
>>
>>Pasadena, CA 91125
>>
>>Tel. 626-395-2839
>>
>>
>>
>
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