From: "Daniel Glöckner" <daniel-gl@gmx.net>
To: Sam Logen <starz909@yahoo.com>
Cc: video4linux-list@redhat.com
Subject: Re: Question - Component input via software card
Date: Tue, 3 Jun 2008 23:49:18 +0200 [thread overview]
Message-ID: <20080603214917.GA596@daniel.bse> (raw)
In-Reply-To: <986038.14508.qm@web35602.mail.mud.yahoo.com>
On Tue, Jun 03, 2008 at 01:55:07PM -0700, Sam Logen wrote:
> Now, software capture cards collect raw information
> from their video and audio composite jacks, right?
Some capture cards can collect raw information.
> Then the software processes these streams into a file.
No, drivers make the card process the raw data for normal use.
This is too much to be done in software.
> Would it be possible to connect component cables from
> a high def. video source to the video and audio
> composite plugs of the capture card, and have a
> program process the three streams together as video
> streams instead of video and audio streams, then save
> the result in a file?
Baseband audio inputs are usually sampled at a much lower frequency than
video inputs.
And if audio is not input as baseband signal, there is only one ADC.
> Or would the hardware on the capture card filter out
> anything it would not perceive as audio?
In baseband audio there may be an analog low pass filter corresponding
to the low sampling rate.
I don't know any chip that captures raw modulated audio.
But on the other hand I don't know that many chips.
> I'm not taking into consideration processing power or
> hard drive access bottlenecks, or other hardware
> limitations beyond the capture card.
It is a bit difficult to consider the limitations of an unknown capture
card.
Daniel
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next prev parent reply other threads:[~2008-06-03 21:49 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-06-03 20:55 Question - Component input via software card Sam Logen
2008-06-03 21:22 ` Daniel Gimpelevich
2008-06-04 22:33 ` Sam Logen
2008-06-04 23:15 ` Christoph Willing
2008-06-03 21:49 ` Daniel Glöckner [this message]
2008-06-05 21:25 ` Sam Logen
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