I don't know about DM6446, but on DM355 the limiting factor is DDR
memory bandwidth. I tried to capture two sync locked 8-bit BT.656
streams side-by-side as 16-bit input and use DMA to separate them for
display. It worked, but there was not enough DDR memory bandwidth to do
this and output the image with an OSD enabled - VPBE was starved of data
and lots of tearing / visual artifacts appeared.
Not sure if you will have the same issues but it's something you might
want to be aware of.
--
Jon Povey, Design Engineer
[EMAIL PROTECTED] | +44(0)1280 825983
________________________________
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On
Behalf Of Panchy Rivas
Sent: 24 July 2008 20:18
To: [email protected]
Subject: 4 video capture and SMP-linux support
I am working on a similar system. I just got the DM6446EVM
today so I am just getting started. I was thinking because the front
end video port can be 1280 pixels per horizontal line then 2 channels
(minus a little bit on the edges) can fit side by side to process 2
channels. If you include the interlace artifact remover then we could
actually fit 4 channels. The TVP5154 could be used as the decoder to a
FPGA then to the DM6446.
Please if anyone has done this or similar please let me know if
there is enough resources to do this.
Thank you,
Panchy
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