PSP 480x272

Ever tried to render a clip for SONY's PSP? Here we go. It's tested with a PSP 3004 Firmware v. 5.7 and 16:9 / 25fps input files. This should work with most pre-build ffmpeg packages. Many of them do not include support for libfaac for license reasons, so the experimental aac audio codec is used. One, who compiled ffmpeg him/herself with libfaac support should change to acodec=libfaac and delete strict=experimental.