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stitcher_detailed sample is not working

hi!

I built opencv3.0 from source on my ubuntu trusty machine. I also built the samples. I made sure to install the opencv_contrib package as well.

I am trying to run the stitcher_detailed sample from the samples directory, but it just doesnt seem to work with default parameters.

$ ./a.out ../IMG_8563_thumb.jpg ../IMG_8564_thumb.jpg OpenCV Error: Assertion failed (timelapse) in main, file stitching_detailed.cpp, line 818 terminate called after throwing an instance of 'cv::Exception' what(): stitching_detailed.cpp:818: error: (-215) timelapse in function main

Aborted (core dumped)

If I pass in a parameter for timelapse, it runs to completion but does not generate any file.

$ ./a.out ../IMG_0225_thumb.jpg ../IMG_0227_thumb.jpg --preview --timelapse crop 100

Any idea what I am doing wrong?