Frame access from servlet not working

Question

Dear all,
I am running my servlets on Tomcat 5.5 and using JDK 1.6. I have a small program that uses codecs to access frames from a video file. PreAccessCodec implements Codec interface and PostAccessCodec extends PreAccessCodec. I set the two codecs into the processor's codec chain. The program is implemented as a thread and once started grabs frames and stores the images in a certain interval. The problem is this: whenever I start the thread from a main program, everything runs without a glitch. However, when I put the code in init() method of the servlet, I get the following error message:
The input format is not compatible with the given codec plugin: com.mapper.utils.PostAccessCodec@69d02b
Failed to realize: com.sun.media.ProcessEngine@1478a43
  Cannot build a flow graph with the customized options:
    Unable to add customed codecs:
      com.mapper.utils.PreAccessCodec@15356d5
      com.mapper.utils.PostAccessCodec@69d02b
Error: Unable to realize com.sun.media.ProcessEngine@1478a43 I am using netbeans 5.5.1 to deploy my servlets. I doubt that the problem is with classpaths because the servlet doesn't complain when I am using JMF's classes like Processor.
I would really appreciate any help.
Thank you.
Message was edited by:
calculemus

Answer 1

The GE.iH() method should return false for
a ..head-full ..en-headed, not headless
environment, and I expect (from what you
reported above) that will return false for both
your servlet and application, and is apparently
not the problem.It returned false when I tried GE, and it was not the problem as you suggested. However, I now noticed in the logs:
java.awt.HeadlessException
I use Netbeans for the development, and I tried using -Dheadless=true and -Dheadless=false, it did not change anything...
I think it is time to check that assumption
more carefully.
My impression is that PreAccessCodec and
it's 'Post' equivalent are mentioned a lot in JMF
example code, but are custom classes,
built to suit the use at the time. Did you write the
Pre/PostAccessCodecs for this app.?Yes I customized them from the JMF sample codes. They are in the classpaths and are correctly read by the servlet. I did some logging and I actually saw that the code inside Pre/PostAccess was logging when my servlet was run.
>
So, what I am thinking, is that while the JMF
based Processor class may well be on the
server's
classpath, perhaps Pre/PostAccessCodec classes
are not.
oes a jar appear in the WEB-INF/lib directory,
that contains the Pre/PostAccessCodec.class?
Failing that, are the classes themselves in
WEB-INF/classes/(sub-dir according to package name)/ ?Nevertheless, just to double check I checked WEB-INF directory and the classes appear correctly in their appropriate 'package-folders'.
I figured out where exactly the thread was not running. In my PostAccessCodec class, I had overloaded getSupportedInputFormats() function to return RGB format.
public Format [] getSupportedInputFormats() {
Format [] fomats = {new RGBFormat()};
return fomrats;
When I changed it to return {VideoFormat()}, the codec initializes, but I get nothing when I want to access the frame.
I guess I will have to start another thread.
@moderators, please move the post if it is inappropriate to put it in this thread, my apologies.
The problem is still there and I am not able to get the frame access not working from the servlet. :(
Message was edited by:
calculemus
Message was edited by:
calculemus