Re: capture.c example (multiple inputs)

["Brian Phelps" <lm317t@xxxxxxxxx>]

Hi Daniel,


On Tue, Oct 7, 2008 at 10:52 AM, Daniel Glöckner <daniel-gl@xxxxxxx> wrote:
> On Tue, Oct 07, 2008 at 09:57:28AM -0400, Brian Phelps wrote:
>> I did some digging and it looks like this single chip bt878 card must
>> cut the frame rate when switching inputs.  Is this correct?
>
> correct.
>
>> I found a 4-chip version from bluecherry.com that seems to do this at
>> full 30 FPS per channel.
>
> You mean .net, not .com?
Yes its bluecherry.net, I was in a hurry
>
> Be warned, depending on your system there may be dropped pixels when
> capturing four inputs at high resolution in inefficient color spaces.
> Especially when you try to write the videos to harddisk while the
> harddisk controller shares a PCI bus with the capture card.

Thanks for the advice Dan.
I am a bit of a newbie the concept of PCI buses. In this example (not
mine) is the 1e that the bt878 card is on, on a different bus than the
IDE controller, 1f?:
# lspci -tv
-[00]-+-00.0  Intel Corporation 82845G/GL[Brookdale-G]/GE/PE DRAM
Controller/Host-Hub Interface
      +-02.0  Intel Corporation 82845G/GL[Brookdale-G]/GE Chipset
Integrated Graphics Device
      +-1d.0  Intel Corporation 82801DB/DBL/DBM (ICH4/ICH4-L/ICH4-M)
USB UHCI Controller #1
      +-1d.1  Intel Corporation 82801DB/DBL/DBM (ICH4/ICH4-L/ICH4-M)
USB UHCI Controller #2
      +-1d.2  Intel Corporation 82801DB/DBL/DBM (ICH4/ICH4-L/ICH4-M)
USB UHCI Controller #3
      +-1d.7  Intel Corporation 82801DB/DBM (ICH4/ICH4-M) USB2 EHCI Controller
      +-1e.0-[01]--+-02.0  Brooktree Corporation Bt878 Video Capture
      |            +-02.1  Brooktree Corporation Bt878 Audio Capture
      |            \-05.0  Realtek Semiconductor Co., Ltd. RTL-8139/8139C/8139C+
      +-1f.0  Intel Corporation 82801DB/DBL (ICH4/ICH4-L) LPC Interface Bridge
      +-1f.1  Intel Corporation 82801DB (ICH4) IDE Controller
      +-1f.3  Intel Corporation 82801DB/DBL/DBM (ICH4/ICH4-L/ICH4-M)
SMBus Controller
      \-1f.5  Intel Corporation 82801DB/DBL/DBM (ICH4/ICH4-L/ICH4-M)
AC'97 Audio Controller


>
>  Daniel
>



-- 
Brian Phelps
System Design Engineer
Custom Light and Sound
919-286-0011
http://customlightandsound.com

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