Fix MHP3 Chinese version crash in scempeg and scejpeg

![1](https://f.cloud.github.com/assets/2177532/2071842/c9601182-8d2f-11e3-9d1f-77589359e15f.png)
![2](https://f.cloud.github.com/assets/2177532/2071847/cf1f45a2-8d2f-11e3-8c87-83fdd87d763e.png)
![3](https://f.cloud.github.com/assets/2177532/2071849/d68121ee-8d2f-11e3-86ca-82c9c0f800d6.png)

Fix based on JPCSP trace log
07:41:31 videoThread - sceMpegAvcConvertToYuv420 0x9C02828, 0x9836F80, 0x92F4240, 0x0 = 0x806201FE
07:41:31 videoThread - sceJpegCsc 0x11E9E000, 0x9836F80, 0xFFFEFFFF, 0x200, 0x20202 = 0x80650051