[linux-dvb] Re: [BUG] FusionHDTV5 Lite

Hamish Moffatt hamish at cloud.net.au
Mon Sep 12 07:57:33 CEST 2005


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 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?). 

Compare that to up to 20Mbit/sec of MPEG2 data *on the audio path*.


Hamish
-- 
Hamish Moffatt VK3SB <hamish at debian.org> <hamish at cloud.net.au>



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