On 11-10-13 04:45 AM, Rubén Pérez wrote: > I'm confused: > > aren't Bluecherry cards already being used with Gstreamer? If the v4l2 > driver exposes the card capabilities correctly, is there a real need for > an specific gstreamer plugin? Wouldn't be better to dedicate efforts to > improve the driver conformance to the v4l2 standards and document their > use (and maybe providing some software to automatize the operations to > fine-tune the cards?).
The current cards do not do hardware encoding. The gstreamer plugin would let us specify the encoding settings without (presumably) reloading the driver like the old Hauppauge cards. G > Best regards > Rubén > > 2011/10/11 Christopher Brooks <[email protected] > <mailto:[email protected]>> > > Hi, > > Just to chime in. One of the particularly nice things about using a > dedicated hardware encoder for incoming video streams is that the > presentation stream (hdmi/vga/etc.) could then have more access to the > CPU for encoding. Really nice when you want to squeak more frames out > of it at a higher bitrate. > > The H.264 compression cards are pretty reasonably priced, I think we > pay $150 for the non hardware encoding cards right now. And that's for > a card that only does one port at 30 fps, and each additional feed > would drop the fps in half. That BC-H04120A can do 30 fps > simultaneously on all ports. > > Network streaming would be great for finishing off confidence > monitoring. A feature lacking in Matterhorn (though some is coming up > in 1.3) in part because of the need to encode multiple streams... > > Chris > > On Tue, 11 Oct 2011 > 15:40:02 -0500 Curtis Hall <[email protected] > <mailto:[email protected]>> wrote: > > > Hi, > > > > I'm Curtis with Bluecherry. We provide software compression cards > > that some Opencast members are using (PV-143, PV-149, PV-981 etc). > > We also produce H.264 hardware compression cards which does the > > compression on the card itself. We also provide a Video4Linux2 > > driver for these cards ( https://github.com/bluecherrydvr/solo6x10). > > > > I've talked to Chris Brooks a couple times about these cards and I've > > gained some decent information on how these cards can benefit the > > Opencast application by compressing the video on the cards instead of > > on the processor. I've attached a couple emails between Chris and our > > developers about what the gstreamer plugin would need to support. > > > > My question comes down to the amount of people that would potentially > > be interested in these cards. We would incur a expense in hiring a > > contractor to complete the gstreamer plugin, so I'm doing the math to > > see if it would be cost effective for us to start on the gstreamer > > plugin. > > > > The following cards are available: > > > > BC-H04120A PCIe ($219.95) - 4 port > > BC-H04120A Mini-PCI ($199.95) - 4 port > > BC-H16480A PCIe ($299.95 - 16 port > > > > > > http://store.bluecherry.net/search.php?search_query=bc-h&button.x=0&button.y=0&button=Submit > > <http://store.bluecherry.net/search.php?search_query=bc-h&button.x=0&button.y=0&button=Submit> > > > > Thanks! > > > > > > > > -- > Christopher Brooks, BSc, MSc > ARIES Laboratory, University of Saskatchewan > > Web: http://www.cs.usask.ca/~cab938 > Phone: 1.306.966.1442 > Mail: Advanced Research in Intelligent Educational Systems Laboratory > Department of Computer Science > University of Saskatchewan > 176 Thorvaldson Building > 110 Science Place > Saskatoon, SK > S7N 5C9 > _______________________________________________ > Matterhorn-users mailing list > [email protected] > <mailto:[email protected]> > http://lists.opencastproject.org/mailman/listinfo/matterhorn-users > > > > > _______________________________________________ > Matterhorn-users mailing list > [email protected] > http://lists.opencastproject.org/mailman/listinfo/matterhorn-users
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