Difference between capture rendering and video file rendering

Hello,
I am using JMF to process a video coming from a camera or from a video file, but I noticed some differences in the screen output between these two cases.
I created a Processor and attached an Effect plug-in to its codec chain. On every frame, some processing is done in the process() method of the Effect. Every automatic update of the processor's visual component fires automatic update of my transparent custom drawing pane positioned on top of it (because they overlap). This way I can easily draw some lines over the video layer.
This works fine on capture. When the video comes from a file, however, the JMF visual component always shows the previous frame (not the one just processed), so my drawings are out of sync (they are a step ahead from the frame displayed).
Why is that? The processing code is the same for the capture and the files, only the dataSource is created differently.
Thanks in advance!

b.o.j.o. wrote:
How could I fix this problem?Render the frames yourself.

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--- Continuation from previous Post -----
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