PLAYMOVIE ACTION stuck at one frame?

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Wed, 08/05/2009 - 07:16 am

Hi !

I have a small problem with playmovie action function it would be nice if someone know the trick.
I am using Igor 6.04 and I am using the "Playmovie action" command to view (and also extract) individual frames from AVI files.
My problem is that if I try to view a frame by using the playmovieaction after the 32550 th frame, for example "PlayMovieAction frame= 32600"
Igor doesn't get the frame and get stuck around the 32550the frame, that it shows me.
But still no error message is generated such as "out of memory" or "#2015"
My question is: Is there a limit for Igor using the PLAYMOVIE ACTION ? and is there any way that I could get around that without having to cut my movie in segment of 30000 frames?
thanks to all of you in advance!

Youpi

Ps:My movie is 128pixcels wide and 132pixcels high and 99000 frames long.
I know it is a really long movie but I am acquiring the movie at 500 hz during more than 3 minutes so there is no mystery...
Someone else recently reported this problem to support.

It appears to be a built-in limitation of QuickTime which appears to be using a 16 bit integer and thus limited to 32767 max. It is interesting that you can't even go that high.

I asked the other user to do a few tests but unfortunately they never responded. Here is what I asked:
Quote:

One more thing to test it you don't mind: Try
PlayMovieAction gotoEnd

and see if it really does.

Then try stepping backwards:

PlayMovieAction step= -1


I doubt this will work but try this also:

PlayMovieAction frame= 32766
PlayMovieAction extract=10 // try extract across the 32767 boundary

NewImage M_MovieChunk

Then use
ModifyImage M_MovieChunk,plane= 1 // try different plane values and see it they can cross the boundary

Later: this actually might work because it uses a different way of sequencing through the frames.

August 5, 2009 at 02:10 pm - Permalink