v4l4j failing on Ubuntu Precise - build from source

[sami...@gmail.com]

I build v4l4j from source on Ubuntu 12.04
the connected Logitech C920 then run ant deviceinfo

initially got unhandled format H.264 message and after more information on shell jvm crashed.

uninstalled v4l4j

Built debug version and run ant device info

jvm crashed again

output is attached as text file


Regards

[sami...@gmail.com]

plugged in a usb microscope (simple uvc device with 640X480 and 320X240)

that works perfectly.

then run ant test-gui works ok able to see video in gui

Now plugin Logitech C920
and run ant tes-gui

video comes through but when test gui window is closed jvm crashes
seems that there is a failure while releasing memory and this happens specifically
while handling logitech c920

attached log files

[Gilles Gigan]

Hi,
Can you send this file:
/home/samhita/Downloads/v4l4j/hs_err_pid5602.log

Thanks

GIlles

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[Gilles Gigan]

Actually, this bug should be fixed in trunk. Can you also try and let me know.

Thanks
Gilles

[sami...@gmail.com]

build from trunk
tried to run ant deviceinfo  - target not found

run ant test-gui with logitech c920 got image feed and quit GUI without jvm crash

good till now will throw in a few code specs to test device info for logitech c920
in a couple of hours and send an update.

thanks you for super quick response and this wonderful wrapper. time to push
the fps on RPI

Regards

[sami...@gmail.com]

dump info worked without crashing the jvm
but got this message

looks like it is skipping H.264 - support for that format is quite sketchy, i understand...

samhita@samhita-ubuntu:~/Downloads/v4l4j/classes$ java au.edu.jcu.v4l4j.examples.DumpInfo
[ libvideo.c:68 ] Using libvideo version 0.9-libvideo_r488
[ v4l2-query.c:49 ] Error looking up V4L2 format 34363248. Please submit
a bug report on the v4l4j mailing list.[ v4l2-query.c:484 ] libvideo has skipped an unsupported image format:
[ v4l2-query.c:485 ] H.264 (0x34363248)
[ v4l2-query.c:486 ] Please let the author know about this error.
[ v4l2-query.c:487 ] See the ISSUES section in the libvideo README file.
name: HD Pro Webcam C920
Device file: /dev/video0