Segfault - filter "freeze" + pre-render

[GoogleCodeExporter]

What steps will reproduce the problem?
1. Apply the filter "freeze" ("geler" in french) to a sequence
2. Place your cursor on this sequence to pre-render it

What is the expected output? What do you see instead?
What is expected : A pre-render of the sequence with the filter.
What happen : a segmentation fault

What version of the product are you using? On what operating system?
Flowblade 0.12.0
Linux Mint 15, MATE 1.6.0

Please provide any additional information below.
This also happen when the cursor is already on the sequence and you use this 
filter.

I didn't manage to use gdb for further informations, because /usr/bin/flowblade 
is a shell script.

(also, I know this isn't the right place, but... Where can I find help on 
flowblade. I want to do a specific task and I don't kow how...)

Original issue reported on code.google.com by tapata.t...@gmail.com on 29 Jun 2014 at 3:38

[GoogleCodeExporter]

After several tests, it seems to happen mode or less randomly.

Sometimes I can apply the filter without problems.

Sometimes the program doen't crash, but the pre-render freezes (ironic, isn't 
it ?), so clicking the play button does nothing (even if I move the cursor to a 
sequence where the freeze filter isn't applied), and if I move another window 
than flowblade on the pre-render, there is a grey mark, like you have with a 
frozen window.

Sometimes I also have this error display in console : "[h264 @ 0x7fbd10044c00] 
mmco: unref short failure", with or without segfault or freeze.

Also, those errors seems to be less likely to happen when the sequence is long 
enough.

Original comment by tapata.t...@gmail.com on 29 Jun 2014 at 3:56

[GoogleCodeExporter]

Tested with flowblade 0.14.0 : same problem.

Original comment by tapata.t...@gmail.com on 29 Jun 2014 at 4:08