import error

[m3o7]

Hi Sean,

thank you for providing your code to interface with the raspberry pi camera!
Unfortunately I am not able to run picam. I am getting an import error:

---------------------------------------------------------------------------
ImportError                               Traceback (most recent call last)
<ipython-input-1-ae50f21e1c18> in <module>()
----> 1 import picam
      2 import time

/usr/local/lib/python2.7/dist-packages/picam/__init__.py in <module>()
      1 # Copyright (c) 2013 Sean Ashton
      2 # Licensed under the terms of the MIT License (see LICENSE.txt)
----> 3 from _picam import *
      4 import StringIO
      5 from PIL import Image

ImportError: /usr/local/lib/python2.7/dist-packages/picam/_picam.so: cannot open shared object file: No such file or directory

Do you know what I may have been missing? I have been following the installation instructions and also tried to unsuccessfully re-compile the _picam.so file myself.

Any help is appreciated!

Kind Regards,
Marco

[ashtons]

Are there any files in the folder /usr/local/lib/python2.7/dist-packages/picam/ ?

[m3o7]

Yes, there are.

pi@raspberrypi ~ $ ls -l /usr/local/lib/python2.7/dist-packages/picam
total 48                                                                    
-rw-r--r-- 1 root staff  1819 Nov 18 14:47 __init__.py                      
-rw-r--r-- 1 root staff  2903 Nov 21 23:29 __init__.pyc                     
-rw-r--r-- 1 root staff 39567 Nov 18 14:47 _picam.so 

I have also created a stackoverflow question but did not get enough information to solve the import error.

[ashtons]

It may be due to missing dependancies required to load the library.
Does the command

raspistill -o image.png

work as expected and produce an image file?

If not, you may need to enable the camera and restart the Rpi.
http://www.linuxuser.co.uk/tutorials/pi-camera-quick-installation-guide

Then try and run the script again

[m3o7]

raspistill -o image.png works as expected. I also have tried different libraries such as picamera, which works fine.

[ashtons]

Can you try the following command

ldd /usr/local/lib/python2.7/dist-packages/picam/_picam.so 

[m3o7]

pi@raspberrypi ~ $ ldd /usr/local/lib/python2.7/dist-packages/picam/_picam.so 
not a dynamic executable

[ashtons]

Something is not right with the file, try this

file /usr/local/lib/python2.7/dist-packages/picam/_picam.so 

you should see something like the following

_picam.so: ELF 32-bit LSB shared object, ARM, version 1 (SYSV), dynamically linked, BuildID[sha1]=0xe403bf379f8c1dc2cb82df774ac3f11998661ff1, not stripped

[m3o7]

got the exact same output - even the hash is the same:

pi@raspberrypi ~ $ file /usr/local/lib/python2.7/dist-packages/picam/_picam.so 
/usr/local/lib/python2.7/dist-packages/picam/_picam.so: ELF 32-bit LSB shared object, ARM, version 1 (SYSV), dynamically linked, BuildID[sha1]=0xe403bf379f8c1dc2cb82df774ac3f11998661ff1, not stripped

[ashtons]

How about

readelf -d /usr/local/lib/python2.7/dist-packages/picam/_picam.so 

[m3o7]

readelf -d /usr/local/lib/python2.7/dist-packages/picam/_picam.so 

Dynamic section at offset 0x700c contains 37 entries:
  Tag        Type                         Name/Value
 0x00000001 (NEEDED)                     Shared library: [libmmal_core.so]
 0x00000001 (NEEDED)                     Shared library: [libmmal_util.so]
 0x00000001 (NEEDED)                     Shared library: [libmmal_vc_client.so]
 0x00000001 (NEEDED)                     Shared library: [libvcos.so]
 0x00000001 (NEEDED)                     Shared library: [libbcm_host.so]
 0x00000001 (NEEDED)                     Shared library: [libpython2.7.so.1.0]
 0x00000001 (NEEDED)                     Shared library: [libpthread.so.0]
 0x00000001 (NEEDED)                     Shared library: [libdl.so.2]
 0x00000001 (NEEDED)                     Shared library: [librt.so.1]
 0x00000001 (NEEDED)                     Shared library: [libvchiq_arm.so]
 0x00000001 (NEEDED)                     Shared library: [libc.so.6]
 0x0000000e (SONAME)                     Library soname: [_picam.so]
 0x0000000f (RPATH)                      Library rpath: [/home/pi/SOURCE/userland/build/lib]
 0x0000000c (INIT)                       0x1d88
 0x0000000d (FINI)                       0x5840
 0x00000019 (INIT_ARRAY)                 0xf000
 0x0000001b (INIT_ARRAYSZ)               4 (bytes)
 0x0000001a (FINI_ARRAY)                 0xf004
 0x0000001c (FINI_ARRAYSZ)               4 (bytes)
 0x00000004 (HASH)                       0xf8
 0x6ffffef5 (GNU_HASH)                   0x444
 0x00000005 (STRTAB)                     0xcbc
 0x00000006 (SYMTAB)                     0x5bc
 0x0000000a (STRSZ)                      2330 (bytes)
 0x0000000b (SYMENT)                     16 (bytes)
 0x00000003 (PLTGOT)                     0xf154
 0x00000002 (PLTRELSZ)                   712 (bytes)
 0x00000014 (PLTREL)                     REL
 0x00000017 (JMPREL)                     0x1ac0
 0x00000011 (REL)                        0x16f8
 0x00000012 (RELSZ)                      968 (bytes)
 0x00000013 (RELENT)                     8 (bytes)
 0x6ffffffe (VERNEED)                    0x16b8
 0x6fffffff (VERNEEDNUM)                 2
 0x6ffffff0 (VERSYM)                     0x15d6
 0x6ffffffa (RELCOUNT)                   114
 0x00000000 (NULL)                       0x0

[ashtons]

I'm stumped. Not sure what could be causing this behaviour.
I'll keep looking and see if I can find something

[m3o7]

Thank you!

[ashtons]

Is there anything different about your filesystem?
Are you using SDCard or USB for the root file system?

[m3o7]

Sorry, not that I am aware of. I am using a standard SDCard setup - 16GB Raspian Wheezy Pre-Loaded.
I also did not install/setup other unusual packages - all I do once in a while is apt-get update/upgrade. (I have a wifi USB-plugged in, but that should not be interfering at all). I also tried compiling the *.so myself, but after I got to the userland part I gave up.