Getting Firewire webcam feed [SEC=UNCLASSIFIED]

[Doran, Mitchell (Student)]

UNCLASSIFIED

Thanks for the replies, I am currently working my way through the
documentation. My current goal is to take the dv1394src and simply have
it display on the screen so that I can confirm my devices are working
correctly. My end goal is to take this input, feed it through particular
pipelines and have it sink out in a form that my OpenFrameworks OpenCV
project can read the camera input. 
 
With my limited knowledge I am attempting to do something like
dv1394src ! dvdemux ! dvdec ! xvimagesink
My thoughts are, I want to take the input source, split the audio and
video (where does the audio go in this case?), then decode the video so
that my xvimagesink can display it. 
 
But so far no success. I will continue reading through the documentation

 
Regards,
Mitch
 
 

________________________________

From:
gstreamer-devel-bounces+mitchell.doran=dsto.defence.gov.au at lists.freedes
ktop.org
[mailto:gstreamer-devel-bounces+mitchell.doran=dsto.defence.gov.au at lists
.freedesktop.org] On Behalf Of Chuck Crisler
Sent: Wednesday, 22 May 2013 11:22 PM
To: Discussion of the development of and with GStreamer
Subject: Re: Getting Firewire webcam feed [SEC=UNCLASSIFIED]


Continuing from Ian, the approach is to consider both the source and the
sink, then simply plumb the needed parts between. Some of the lingo is
technology specific, so there is a learning curve. Post your
requirements and we can help. There are a lot of options...



On Wed, May 22, 2013 at 5:30 AM, Ian Davidson
<id012c3076 at blueyonder.co.uk> wrote:


	Hi Mitch,
	
	You should think of GStreamer rather like a collection of LEGO
bricks.  Put them together the right way and you can make anything you
want.
	
	Your example has merely specified where it should get its input
from - but you haven't specified what you want to do with it.
	
	Take a look at the documentation
(http://gstreamer.freedesktop.org/documentation/) and skim through the
Application Development Manual.  Although this is labelled "Read This
First", it does dive straight into programming - but look at the section
"Utility applications provided with GStreamer" and the section on
gst-launch.  Also, look at the man pages on gst-launch.
	
	At the very least, you will need some sort of 'sink' to take
your video stream and display it somewhere, maybe xvimagesink.  You may
need to process the video and store it using 'filesink'.
	
	When you read about the individual elements, many of them will
give examples of a pipeline to make use of them which you can then adapt
to handle your source.
	
	Hope that helps
	
	Ian 


	On 22/05/2013 08:53, Doran, Mitchell (Student) wrote:
	

		UNCLASSIFIED 

		Hi guys, 

		I feel bad bothering the mailing list with something as
trivial is this. I am not familiar with digital video concepts, codecs,
gstreamer and pipes however I have been tasked to get some older
firewire cameras working on Ubuntu 12.10. I have figured out that I want
to use dv1394src to get my video feed and when I run
		
		Gst-launch-0.10 dv1394src 

		It seems to work. Unfortunately I am so new to this that
I havent been able to work out the correct codecs and pipelines to
actually display any output on the screen. There doesn't seem to be many
resources online regarding the use of Gstreamer with firewire cameras. 

		Any help is appreciated. 

		Regards,
		Mitch Doran 

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