This bug also affects Ubuntu 14.04.
python-opencv tries to import libavcodec.so.53, which is not installable and is
not listed in python-opencv dependencies.
File "/usr/lib/python2.7/dist-packages/cv.py", line 1, in <module>
from cv2.cv import *
ImportError: libavcodec.so.53: cannot open shared object file: No such file or
directory
The repositories only list 52 and 54. I tried symlinking the missing
dependencies to newer version, but it does not
ln -s /usr/lib/x86_64-linux-gnu/libavcodec.so.54
/usr/lib/x86_64-linux-gnu/libavcodec.so.53
ln -s /usr/lib/x86_64-linux-gnu/libavformat.so.54
/usr/lib/x86_64-linux-gnu/libavformat.so.53
ln -s /usr/lib/x86_64-linux-gnu/libavutil.so.52
/usr/lib/x86_64-linux-gnu/libavutil.so.51
But then it will fail with:
File "/usr/lib/python2.7/dist-packages/cv.py", line 1, in <module>
from cv2.cv import *
ImportError: /usr/lib/x86_64-linux-gnu/libavutil.so.51: version `LIBAVUTIL_51'
not found (required by /usr/lib/libopencv_highgui.so.2.4)
Output of ldd /usr/lib/python2.7/dist-packages/cv2.so | grep "not found":
libavcodec.so.53 => not found
libavformat.so.53 => not found
libavutil.so.51 => not found
This affects 64bit systems, BUT NOT 32bit systems.
So, it seems that:
1. The 64bit python-opencv package is compiled against libraries which does not
exist in 14.04 (but 32bit is OK).
2. libavcodec, libavformat, libavutil and maybe other libraries are not listed
as dependencies (in both arch).
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https://bugs.launchpad.net/bugs/1161485
Title:
/usr/lib/pyshared/python2.7/cv2.so depends on missing libavcodec52?
Status in “opencv” package in Ubuntu:
Confirmed
Bug description:
After installing python-opencv in Ubuntu 12.04 LTS, the python
statement "import cv2" results in an error:
ImportError: libavcodec.so.52: cannot open shared object file: No such
file or directory
Which is correct since libavcodec.so.52 is not installed nor is it
possible to install it from the regular respositories since itis be
replaced by libavcodec.so.53. Checked with another system, which also
runs 12.04, but a fresh install instead of an upgrade from 10.04 (some
time ago) and to my astonishment, the same .deb package (downloaded
straight from
http://nl.archive.ubuntu.com/ubuntu/pool/universe/o/opencv/python-
opencv_2.3.1-7_i386.deb and unpacked with dpkg -x) show different
dependencies:
gerwin@PC1:/tmp/python-opencv/usr/lib/pyshared/python2.7$ ldd cv2.so | grep
avcodec
libavcodec.so.53 => /usr/lib/i386-linux-gnu/i686/cmov/libavcodec.so.53
(0xb51f7000)
vs.
gerwin@PC2:/tmp/python-opencv/usr/lib/pyshared/python2.7$ ldd cv2.so | grep
avcodec
libavcodec.so.52 => not found
Is there another part in the system that defines the dependencies
other than the files themselves?
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