The XMB's video player renders Motion JPEG AVIs with sceMpegBaseYCrCbCopyVme
and sceMpegBaseCscVme (JPCSP's names), which take planar YCbCr in two halves
rather than the ME's tiled layout. The copy sizes follow mpegbase_260.prx.
sceMpegBaseYCrCbCopy took the frame size from the destination descriptor,
which the same player leaves unset. mpegbase_260.prx reads it from the
source, in pixels.
Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>