I also found the same problem when using the AV_PIX_FMT_RGBA. Seems any 32 bit format would cause a JVM crash.
The sample code I used to reproduce it is:

public class DemoAVFreeCrash {

  public static void main(String[] args) throws Exception {
    
    IntStream.range(0, 10).forEach(i -> {
      System.out.println("Starting grabber: times=" + i);
      
      try (FFmpegFrameGrabber grabber = new FFmpegFrameGrabber(new FileInputStream(new File("C:\\Users\\user\\Desktop\\video.webm")))) {
        grabber.setPixelFormat(avutil.AV_PIX_FMT_RGBA);
        grabber.start();
        
        // Grab a Frame and properly close it
        try (Frame frame = grabber.grabImage()) {
          System.out.println("Frame grabbed: " + frame.timestamp);
        }
      } catch (Exception e) {
        e.printStackTrace();
      } finally {
        System.out.println("Finnaly reached!");
      }
      
      System.out.println("Closed grabber successfully: times=" + i);
    });
  }
}

And the output is:

Starting grabber: times=0
Frame grabbed: 0
Finnaly reached!
Closed grabber successfully: times=0
Starting grabber: times=1
Frame grabbed: 0

It never completes more than 2-3 iterations. Always is failing when freeing the frame av_free(image_ptr[i]);
I've reproduced the same behavior in the latest javacv 1.5.9. I've also tried different video formats (mp4/webm) and always is crashing at closing the resource.

Do you have any idea on why the pixel format with 32 bit could produce this issue?

Thanks in advance for your awesome library!

Grabber is at a risk of crashing #1960

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