Problem is having more than one FrameAccess object running in multithreads

Hi all,
I have a problem with my system which uses JMF for frame capture for frame processing. The system flow is like this -
I use a FrameAccess.java (modified from the one provided by Sun) to grab frames. I use 5 different threads to create an associated FrameAccess object (i.e. one thread owns its own FrameAccess object ). And then they will do their own processing (all of them are implementing motion estimation thing using buffered image from the frame).
The problem is , when I examine the frames captured from the 5 threads, something irregular happened.
For example, the thread A (capturing video A) may return frames captured from video C. such scenairo happened without signs and patterns. Sometimes a thread even return something like half frame from video C and half from video B.
I would like to know if there is any way to check if it is the problem of JMF (can't synchronize frame capturing), or it's the problem of FrameAccess object (but they are in five independent threads ><")
Thank you very much...

It is a problem with how you are handling threads.
Thread one calls frame access, then thread 2 calls frame access, and it is possible that thread one will only get half a frame.
You will probably have success by syncronizing your calls to frameaccess(lock), and then unlock when that thread has a complete frame.
This way only one thread will access frame access, at any one time.
I have had this exact problem, when trying to capture every single frame, save it to jpeg.
Half the problem was writing to disk before the frame was complete, thus showing have a picture.

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