Merged
requested to merge github/fork/heni/hotfix/fix-SegFault-for-file-with-random-data into master
Created by: heni
[=] fix segfault resulting from incorrect FFMPEG structures deallocation [=] fix some tests to be runnable under python3 [+] add test for correct (segfault free) opening of file with random data [=] fix ContainerProxy.seek behaviour for integers more then 2**31 with 32bit CPython