im4java Convert Crashes on Piped Input/Output

Question

I'm using im4java to convert image. The following program crashes with stack trace: Caused by: org.im4java.core.CommandException: convert: insufficient image data in file /tmp/magick-254901G7YJ9qaMQv5' @ error/jpeg.c/ReadJPEGImage/1154.

Looks like it's generating a temp file. Running the same command directly on ImageMagick command lines gives me correct results.

I'm running ImageMagick-6.9.10-61 and im4java 1.4.0

I wonder if anyone has any insights.

IMOperation op = new IMOperation();
op.addImage("-");
op.addImage("jpg:-");
op.quality(0.85);

try (ByteArrayOutputStream outputStream = new ByteArrayOutputStream()) {
    // image is of type MultipartFile
    Pipe pipeIn = new Pipe(image.getInputStream(), null);
    Pipe pipeOut = new Pipe(null, outputStream);

    convertCmd.setInputProvider(pipeIn);
    convertCmd.setOutputConsumer(pipeOut);
    convertCmd.run(op);

    return outputStream.toByteArray();
} catch (Exception e) {
           //
}

Did you try creating a temp file yourself? Just to check whether it's the pipes or something else. — Thomas
– Thomas, Commented Aug 21, 2019 at 11:33
@Thomas How should I do that? The temp file created every time is different. Can I configure a file to use? — J Freebird
– J Freebird, Commented Aug 22, 2019 at 1:56

Thomas · Accepted Answer · 2019-08-22 07:49:23Z

1

I had a look at some older code where we've done something similar and I realized your problem is the use of 2 pipes where one has a null target and the other has a null source. That might cause the temp file to be used.

Instead of doing that you need to use one single pipe:

try (ByteArrayOutputStream outputStream = new ByteArrayOutputStream()) {
  Pipe pipe = new Pipe(image.getInputStream(), outputStream);

  convertCmd.setInputProvider( pipe );
  convertCmd.setOutputConsumer( pipe );

  return outputStream.toByteArray();
}

From the JavaDoc:

You can use the same Pipe-object for both ends of a process-pipeline.

edited Aug 22, 2019 at 7:49

answered Aug 22, 2019 at 7:39

Thomas

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3 Comments

J Freebird Over a year ago

No luck. Still got the same error. Actually the code was from im4java.sourceforge.net/docs/dev-guide.html, under the pipe section. So I think the code is correct. Maybe configuration issues?

Thomas Over a year ago

@JFreebird that could be the case. Did you make sure that you're using the same IM installation, image and parameters as on the command line?

J Freebird Over a year ago

yes, exactly the same. I realized that I called the Info() before running convert, if I don't call Info() and use filesystem files as input/output (instead of pipe), then the issue is gone.

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