Hamish Moffatt wrote: > > On Mon, Sep 12, 2005 at 07:05:35AM +0200, Edgar Toernig wrote: > > Hamish Moffatt wrote: > > > IMHO the BT878 buffer is too small, as it's not designed for this > > > application. > > > > I'm not that sure that it's the small audio dma fifo. It's half as > > big as the video fifo but video dma has much more than double the > > bandwidth and I've never seen the error with video dma. And both > > are sitting in the same PCI slot. > > In DVB/ATSC applications the video path isn't used. With the Pinnacle you can use both paths simultaneously - it has a video connector on the back ... > With regard to > double the bit rate, for what resolution? Admittedly I don't know the > format of the analog video data on the bus, but for a resolution of say > 320x240 at 24 bit, that's only 1.8Mbit/sec. 3.6Mbit/sec if it's 48 bit > (16-bit per YUV?). That's not per second but per field. Multiply it by at least 25/30 (or is it still 50/60?) to get the real bandwidth/second. A full RGB PAL overlay requires 768*576*32*25 = 354Mbit/sec. > Compare that to up to 20Mbit/sec of MPEG2 data *on the audio path*. Yeah, 20 is peanuts, isn't it ;-) Ciao, ET.
