I solved it following the screenshots here
http://blog.yogarine.com/2007/12/converting-video-for-psp-on-linux.html
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Lucid: MP4 (PSP) format preset makes MP4 in fact unreadable on PSP
https://bugs.launchpad.net/bugs/575232
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Bug
** Changed in: nautilus (Ubuntu)
Status: New => Fix Released
** Changed in: nautilus (Ubuntu)
Status: Fix Released => New
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file manager hangs when mounted nfs drive is no longer accessible
https://bugs.launchpad.net/bugs/164120
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