PNGIO error

Wow I've been tracking this shot in Blender, the image sequence never touched AE. So it must be Blender or my system or something. I've got three of these dead frames in my sequence now.



You can see that since I have good tracking markers in the black area this bad frame became bad after tracking. Is anyone else having this problem or know what it could be that's causing it?

Ok, update. Narrowed it down a bit. I've started backing up and duplicating my image sequences to see where the problem lies. I went to cache out image sequence in movie clip editor coming up with some corrupted frames. I check a frame against my back up sequence to see that my back up frame was fine. So i duplicate the back up and try to cache it again now with corrupted frames at different locations. I do this a few times to find out that it's corrupting frames and that I also have some corrupted frames in my back up sequence. I check those frames against the movie file which they're encoded from to find that that movies frames are fine. I encode those frames to have an image sequence with no corrupted frames. I kept duplicating the clean master sequence, trying to cache, deleting and repeating.

Finally I have the clip cached so I guess I better track this clip now if caching is going to be a "process". So Blender corrupted frames when it created the image sequence from the movie file and corrupted frames while trying to cache the image sequence.

My guess is that Blender was more prone to corrupt frames if there were already corrupted frames in the sequence. Although I still had problems after I had a clean sequence.

I will probably start creating my image sequences from After Effects. That will probably be more reliable on encode and will keep Blenders sequencer pro res free.

With that said Blender still corrupted frames from a fresh blend file with a clean image sequence.

The fact that I'm not seeing this problem around makes me think that I'm doing something wrong or that it's my system.

Mac Pro 2.8 Quad Core Intel
Mac OS 10.6.8
Blender 2.61

Thank you for hearing me out and any insight into this will be greatly appreciated. I don't think I've seen the end of this problem. Back to tracking :)