On Tue, Feb 01, 2005 at 04:09:57PM +0200, Bora ?ahin wrote: > Hi, > > Torben> I'm fairly sure that decoding of > Torben> mpeg2 video in most cases would be too slow to consider without the > help > Torben> of some kind of graphical decoder chip. > > Unless you use some powered CPU. As it would require to give an example, > MPC8540(667-800 MHz) from > PPC family seems ideal for it as a SoC solution...
Even then, this depends completely on what else the platform has to do as well as what profile/level of MPEG-2 you are decoding. Something like a ~800Mhz e500 core has no chance of handling a main profile high level MPEG-2 stream for playback (typically 720p/1080i video). A high-end (1.45Ghzish) 7457 with an optimized altivec mpeg2 software decode library and a video card with iDCT assist is about the minimum PPC for these applications. This is why most consumer products are using something with a decoder, like the integrated one in the IBM STBxxxx chips or the Sigma Designs decoders. -Matt
