FULL PRODUCT VERSION :


FULL OS VERSION :
Raspbian (Debian "Jessie" for armv6hf ABI)

A DESCRIPTION OF THE PROBLEM :
I am writing a library for Processing (http://processing.org/), which encapsulates GStreamer using a native library written in C and JNI. (The specific code is linked below.)

Between 8u77 and 8u91, something caused the performance on ARM - the only platform that my library is targeting - to drop drastically.

Before, I was able to display footage of an USB-attached webcam in real-time. After switching to 8u91, this doesn't work anymore. [1] Before, the library could easily be used to display two instances of the same video simultaneously. Afterwards, one of the two is always dropping frames. [2]

[1] https://github.com/gohai/processing-glvideo/blob/2d6de36a33fde3573b335e9a95cc3e380466f328/examples/SimpleCapture/SimpleCapture.pde
[2] https://github.com/gohai/processing-glvideo/blob/2d6de36a33fde3573b335e9a95cc3e380466f328/examples/TwoVideos/TwoVideos.pde

My library does nothing special, besides interacting with GStreamer, with minimal interaction with JAVA. Only primitive types are passed back and forth through JNI. Indirectly, the examples of the library of course also depend on the large JAVA codebases of Processing and JOGL for GL rendering.

Please let me know if there's anything I can do to narrow down the cause of this issue, or to find a way to restore original performance. For the time being, I could only revert to using an older version of the JDK for ARM. Thank you.

THE PROBLEM WAS REPRODUCIBLE WITH -Xint FLAG: Did not try

THE PROBLEM WAS REPRODUCIBLE WITH -server FLAG: Did not try

REGRESSION. Last worked in version 8u77

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
1. Download and install the March 2016 image of Raspbian (https://downloads.raspberrypi.org/raspbian/images/raspbian-2016-03-18/2016-03-18-raspbian-jessie.zip)
2. Install ant (sudo aptitude install ant)
3. Download the source of the 3.1 release of Processing (with one additional fix): https://github.com/gohai/processing/archive/64ed80aa62e50939803d8140a4c0bbeb83782456.zip
[this will include Java 8u92]
4. Compile and execute Processing using "cd build && ant run"
5. In Processing, install the "GL Video" library using Sketch > Import Library > Add Library
6. Execute the TwoVideos example of the GL Video library's contributed examples

EXPECTED VERSUS ACTUAL BEHAVIOR :
One video will stutter or not play at all. Works fine on 8u77.
REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
Here is the C (JNI'ed) source at the core of my GL Video library:
https://github.com/gohai/processing-glvideo/blob/2d6de36a33fde3573b335e9a95cc3e380466f328/src/native/impl.c

The JAVA part:
https://github.com/gohai/processing-glvideo/blob/2d6de36a33fde3573b335e9a95cc3e380466f328/src/gohai/glvideo/GLVideo.java

But the issue could as well be cause by interaction of the Processing or JOGL source with the 8u91 runtime.
---------- END SOURCE ----------

CUSTOMER SUBMITTED WORKAROUND :
Downgrade to 8u77.