Re: Anyone done a live video broadcast thru Linux?
Chris, Thanks for the suggestion. I've looked hard at Helix and Darwin Streaming Server, but am hesitant to bite just yet. I like StreamStudio, but it appears to be a dead project, and I may have to default back to Darwin or Helix. My main concern lies in that so many of the streaming solutions assume you are doing a true capture thru a capture card, or file serving a feed. I'm trying to do something different in that I'm focusing on a live feed, with as little lag as possible. The live connection puts in a set of issues that I just don't see addressed that often. From my reading, I'm hoping to use a camcorder with a Firewire (IEEE 1394) connection to do the heavy encoding lifting. One of my real questions is how much processor load will I realize by converting from the DV combined audio/video format to something like quicktime, thedora, real, whatever. Will having a capture card with embedded decode on it help? If so, how much? I am hoping that the CPU hit will be less for a conversion than a true encoding, but it's hard to say. The reason I want to lean so much on the dv/1394 solution is that it's a lot easier to find camcorders to borrow than dig up four capable encode/decode capture cards. But those two links I've already bookmarked after browsing thru and will read them in much better detail. I have no doubt the forums will provide me a wealth of information, and I can't thank you enough for the leads. It seems almost anymore that even as good as the search engines are, a lot of the deep forums aren't indexed anymore. Whether or not it's from neglect by the search engines, or that the forum owners don't want the deep linking I don't know. At the end of the day I'd love to use a more well known, possibly stabler solution than an unknown one (StreamStudio), and Darwin Streaming Server has a lot of attention and admiration. I appreciate the information, and the links, and wish you the best of luck. Have a great weekend, Dave Chris Bier wrote:
-----BEGIN PGP SIGNED MESSAGE-----
Dave, You might want to take a look at jclinton's page on H.264 (MPEG4 Part 10) and AAC (MPEG4 Part 3). They will give you a high quality, low bandwidth, well supported on major OSs audio-video format. http://jasonclinton.com/video_journal_howto.xhtml I'm working on setting up and running the Darwin Streaming Server. Which supports several different formats and looks to be easier to deal with than Helix. http://developer.apple.com/darwin/projects/streaming/ https://www.helixcommunity.org/
Chris
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 David Spake wrote: | At the end of the day I'd love to use a more well known, possibly | stabler solution than an unknown one (StreamStudio), and Darwin | Streaming Server has a lot of attention and admiration. It's not linux, but my company makes a box to do what you're wanting: http://www.newtek.com/tricaster/ Does live switching, effects, and can stream to the web at the same time you're feeding a live video output and recording to hard-disk. It also just got nominated for a 2005 Technical Emmy Award! Our box takes regular video inputs. Be careful if you want to use DV inputs, you'll need to watch your cable lengths (make sure you can run a DV signal from your camera to the switcher and get it to work *BEFORE* the day of your broadcast!), and AFAIK, you'll burn additional CPU cycles to decode the DV stream in order to be able to re-encode it at the much lower resolution & bitrate you'll probably be streaming. - -- Charles Steinkuehler charles@steinkuehler.net -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.0 (MingW32) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iD8DBQFC4dyvLywbqEHdNFwRAsDFAKCJkMHuX0Cw+z+ADkomdZCVlHNAUACgv36T 771c8bxLNyqk7P7KKfwl1Vk= =edth -----END PGP SIGNATURE-----
On 7/23/05, Charles Steinkuehler <charles@steinkuehler.net> wrote:
It's not linux, but my company makes a box to do what you're wanting: http://www.newtek.com/tricaster/
Hey, wow, NewTek! Ya know, I've still got a 1st and 2nd gen DigiView in the basement. Even have the A1000 gender adapter... good times, man, good times.
--- Jon Pruente <jdpruente@gmail.com> wrote:
On 7/23/05, Charles Steinkuehler <charles@steinkuehler.net> wrote:
It's not linux, but my company makes a box to do what you're wanting: http://www.newtek.com/tricaster/
Hey, wow, NewTek! Ya know, I've still got a 1st and 2nd gen DigiView in the basement. Even have the A1000 gender adapter... good times, man, good times.
I also still have a DigiView buried somewhere. But these days I editing my duaghter's wedding photo-montage on the Video Toaster/Flyer, and creating various graphics for favors & such in Lightwave. The Amiga User Group still exists, just barely. Email me for more info. _________________________________ Plutonium Nightmare a novel of The VOICE By Erwin K. Roberts In PDF or Print-On-Demand formats. Free on-line preview of Intro & Chapters 1 & 2 Now on sale at http://www.lulu.com/Modern-Knights ____________________________________________________ Start your day with Yahoo! - make it your home page http://www.yahoo.com/r/hs
Jon Pruente wrote:
On 7/23/05, Charles Steinkuehler <charles@steinkuehler.net> wrote:
It's not linux, but my company makes a box to do what you're wanting: http://www.newtek.com/tricaster/
Hey, wow, NewTek! Ya know, I've still got a 1st and 2nd gen DigiView in the basement. Even have the A1000 gender adapter... good times, man, good times.
If we aren't carefull, we'll start an Amiga revival here. I'm an old Amiga man, 500 thru 3000. Loved NewTek as I could always shove the fantastic rendering capabilities in the face of the IBM, Mac and ST fanatics and say 'See what _our_ machines can do?'. =D Dave
Charles Steinkuehler wrote:
It's not linux, but my company makes a box to do what you're wanting: http://www.newtek.com/tricaster/
Thanks for the heads up on that. I've heard that NewTek has survived admirably, and glad to hear they are still in the video production arena. However, as you probably well know, doing anything for a small non-profit convention requires scraping the bottom of the barrel for equipment. That's what I love about Linux so much. Not that it's the bottom of the barrel, but I can use bottom of the barrel equipment and still get good results. Not to mention this is the first time anyone in our arena has tried something like this, so I figure the time and difficulty of figuring out a solution is half the fun. <snip>
Be careful if you want to use DV inputs, you'll need to watch your cable lengths (make sure you can run a DV signal from your camera to the switcher and get it to work *BEFORE* the day of your broadcast!)
Yea, I'm going to do some DV capture of a few educational events in the next couple of months and play around with a spare Duron (1G) machine I have laying around. See just what kind of loads I'm going to have to deal with. , and AFAIK, you'll burn additional CPU cycles to decode
the DV stream in order to be able to re-encode it at the much lower resolution & bitrate you'll probably be streaming.
I had to figure as much. I guess I'll have to play with it some. I've got a friend who's wiling to lend me a with a Hauupage (sp?) 350 to do a true capture via standard video input, and I'll be interested to see what kind of lag time I'll be running with it. I've got to deal with a seperate audio stream as well, so I've got good times ahead. =D Thanks for the suggestion, and keep up the good work. We need more companies like NewTek around. Dave
participants (4)
-
Charles Steinkuehler -
David Spake -
Jon Pruente -
Robert Kennedy