[zaphod24]

Is this maybe related to the FFmpeg thumbnail changes? I'd be glad to upload those image files if it helps.

Yes, that would be the most likely candidate - I've added a link on github to your post.

Can you upload the complete debug log? The images might also be useful, can you upload them in a zip archive to dropbox or google drive, as image hosting services such as imgur.com usually alter the format of the uploaded pictures.

Complete debug log at http://sprunge.us/ObDa

Image files:

https://drive.google.com/file/d/0B8TU_Cp...sp=sharing
https://drive.google.com/file/d/0B8TU_Cp...sp=sharing
https://drive.google.com/file/d/0B8TU_Cp...sp=sharing

Thanks Milhouse!