[mythtv-users] Multiport Video Capture Cards

[Michael Weinbergs - Network Administrator]

Perfect Nick! Thanks..

For your information... I have two cards - the DVB-BT8xx card (which has
DVB + Composite and S-Video) as well as a connexant-type with 4x
Composite - although Myth picks that up as Television, Composite0,
Composite1, and Svideo for some reason.

I haven't got cameras on all of them as yet - so I will check signal as
soon as I can.

Thanks for your valuable input... Exactly what I needed.
-----Original Message-----
From: mythtv-users-bounces at mythtv.org
[mailto:mythtv-users-bounces at mythtv.org] On Behalf Of Nick
Sent: Wednesday, 20 September 2006 11:25 AM
To: Discussion about mythtv
Subject: Re: [mythtv-users] Multiport Video Capture Cards

On 19/09/06, Michael Weinbergs - Network Administrator
<Michael.Weinbergs at wridgways.com.au> wrote:
>
>
> I have been using Mythtv for some time, now I want to extend it.
> I have a 4 port V4L card with 4 cameras around the house outside that 
> I have been using with ZoneMinder - now I want to incorporate it into 
> Myth so the wife can watch this kids in the back yard via Myth.
>
> I have tried to "emulate" this configuration with my DVB-BT8xx card 
> (as BTTV0).
> But I couldn't work out how to set it into a channel list (ie. channel
"6"
> changes to /dev/video0 composite0 port)..
>
> if I could do that, then it would be easy enough for me to point to
> /dev/video1 channel 1,2,3 or 4!

Michael,

Setting this solution up in MythTV depends on how your 4-port cards
presents itself to Linux - as it could either provide (i) 4 V4L devices
(/dev/video[0-3]) each having a single Composite0 input which may/may
not be used simultaneously, or (ii) a single V4L device
(/dev/video0) with 4 inputs (Composite[0-3] via the driver allowing only
one input to be active at a time.

4 V4L devices:
If your card provides you with 4 separate V4L devices, you would need to
add each device (/dev/video[0-3] on the capture cards page, then create
4 video sources, and then in the Channel Editor, create a single channel
for each source. On the Input Connections page, you would then associate
each of the 4 video sources with its respective V4L device/input on your
V4L card, such as:

/dev/video0 Composite0 -> Camera1
/dev/video1 Composite0 -> Camera2
/dev/video2 Composite0 -> Camera3
/dev/video3 Composite0 -> Camera4

When watching LiveTV, you would press the "Change Capture Card" button
to switch between each camera (you could also use the PiP functionality
to watch 2 streams if your capture card allows this).

1 V4L device:
If your card provides you with 4 inputs on a single V4L device, you
would firstly add the capture card device (/dev/video0), then create 4
video sources each containing 1 channel. On the Input Connections page,
you would then associate each of the video sources with its respective
input on your V4L device:

/dev/video0 Composite0 -> Camera1
/dev/video0 Composite1 -> Camera2
/dev/video0 Composite2 -> Camera3
/dev/video0 Composite3 -> Camera4

When watching LiveTV, you would press the "Change Input" button to
switch between each camera.

HTH,
Nick

MythTV Official wiki:
http://mythtv.org/wiki/
MythTV users list archive:
http://www.gossamer-threads.com/lists/mythtv/users
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