Sony MPEG4 Video Recorder - Manual (Page 29)

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176x120, 320x240-3GP and 176x120-3GP are designed for
Mobile Phones. Please refer to your Mobile Phones's manual for
details concerning supported formats and resolutions.
Note:As of the date of this printing, the PSP would not allow
zooming on 368x208 resolution files. It is hopeful that Sony will
correct this shortcoming in future firmware revisions.
MPEG-4 Video Recorder_UM_EN.book Page 25 Thursday, June 22, 2006 2:14 PM