#0  0x00007fffe9497370 in av_buffer_unref () at /usr/lib/libavutil.so.55
#1  0x00007fffe94a2426 in av_frame_unref () at /usr/lib/libavutil.so.55
#2  0x00007ffff1696818 in  () at /usr/lib/libopencv_videoio.so.3.2
#3  0x00007ffff1696a10 in  () at /usr/lib/libopencv_videoio.so.3.2
#4  0x00007ffff1696c29 in cvCreateFileCapture_FFMPEG () at /usr/lib/libopencv_videoio.so.3.2
#5  0x00007ffff1699371 in  () at /usr/lib/libopencv_videoio.so.3.2
#6  0x00007ffff167be5d in cvCreateFileCaptureWithPreference () at /usr/lib/libopencv_videoio.so.3.2
#7  0x00007ffff167ce9a in cv::VideoCapture::open(cv::String const&, int) () at /usr/lib/libopencv_videoio.so.3.2
#8  0x00007ffff167cfbe in cv::VideoCapture::VideoCapture(cv::String const&) () at /usr/lib/libopencv_videoio.so.3.2
#9  0x00000000004015f3 in main ()