limiting settings when encoding for Sony PSP or Apple Ipod.
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WARNING. these are just settings from what i have read and are just examples.
for more settings ,such as all possible video resolutions, please search for
the information yourself.

PSP
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.video
MPEG4 320x240(4:3), 368x208(16:9) at 29.97fps - maximum bitrate 768
.audio
AAC 24000khz - maximum bitrate 128

Ipod
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.video
MPEG4 320x180(16:9),320x240(4:3),480x480(1:1),640x360(16:9) at maximum 30fps
maximum bitrate 2500
Simple Profile so no B-frames, interlaced or custom matrix.
.audio
AAC up to 48000khz - maximum bitrate 160
