Mailing List Archive: MythTV: Users

Four webcams, time shifting

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bruce at brucelin

Mar 7, 2010, 4:27 PM

Post #1 of 3 (479 views)
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Four webcams, time shifting

MythTV users,

I'm trying to do a video art project and I'm trying to understand if MythTV
is the right tool - hope you can help.

It involves taking recordings from four different webcams, delaying them by
varying amounts (1 minute to 12 hours), and displaying the image on four
screens (1 per webcam source).

The hardware requirements are a bit flexible and I'd like high quality
video but really low cost (typical!). If I can find four cheap used
computers, each could run their own copy of MythTV to do the timeshifting.
If I can find enough video cards for one hefty computer to handle all 4
streams, I could do that too. I'd rather not have to buy expensive hardware
video encoding cards.

My initial thoughts were to try to do this with VideoLAN, but it just
doesn't have the same PVR (i.e. timeshifting) capabilities. I could
probably kludge together the 1 minute delay, but the longer times become a
headache.

It's basically timeshifting I'm trying to do, so a PVR package might be the
best bet. I gather MythTV can take webcams as inputs, as long as I have the
right Linux-compatible webcam?

Many thanks in advance,

Bruce

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david.whyte at gmail

Mar 7, 2010, 7:21 PM

Post #2 of 3 (457 views)
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Re: Four webcams, time shifting [In reply to]

On Mon, Mar 8, 2010 at 10:27 AM, Bruce <bruce [at] brucelin> wrote:
> My initial thoughts were to try to do this with VideoLAN, but it just
> doesn't have the same PVR (i.e. timeshifting) capabilities. I could probably
> kludge together the 1 minute delay, but the longer times become a headache.
>
> It's basically timeshifting I'm trying to do, so a PVR package might be the
> best bet. I gather MythTV can take webcams as inputs, as long as I have the
> right Linux-compatible webcam?
>

Not sure, but zoneminder might be an option. It will allow you to
record webcams to disk and play it back. I imagine you can modify the
URL query to somehow always play back video that is 1min, 1hour or
even 1day old or something.

Cheers,
Whytey
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yan at seiner

Mar 7, 2010, 7:28 PM

Post #3 of 3 (449 views)
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Re: Four webcams, time shifting [In reply to]

David Whyte wrote:
> On Mon, Mar 8, 2010 at 10:27 AM, Bruce <bruce [at] brucelin> wrote:
>
>> My initial thoughts were to try to do this with VideoLAN, but it just
>> doesn't have the same PVR (i.e. timeshifting) capabilities. I could probably
>> kludge together the 1 minute delay, but the longer times become a headache.
>>
>> It's basically timeshifting I'm trying to do, so a PVR package might be the
>> best bet. I gather MythTV can take webcams as inputs, as long as I have the
>> right Linux-compatible webcam?
>>
>>
>
> Not sure, but zoneminder might be an option. It will allow you to
> record webcams to disk and play it back. I imagine you can modify the
> URL query to somehow always play back video that is 1min, 1hour or
> even 1day old or something.
>
I'd seriously look at motion. You could do this with a few scripts.

Myth is way too heavy for this very lightweight application.

http://www.lavrsen.dk/twiki/bin/view/Motion/WebHome

Capture the frames, store them, then play them back.

You'd need some CPU horsepower and mando hardrive space but the rest is
easy.

--Yan

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It is not this day!
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