After 12 minutes mencoder stop working

[picchio_75]

I don't understand why after 12 minutes mencoder stop working. I notice that buffer is empty and it isn't load by computer.
q6600 4 gb ram, i belive that it'isnt computer problem because after 2 minuts the buffer is already full, after 10 minutes ps don't create more the buffer
I post debug log Please help me