Re: [Dspace-tech] Video files in DSpace
Ruby, I'm guessing what your IT person meant to say was streaming over HTTP, also known as progressive download. This is generally not as good as streaming from a dedicated media server like Helix or Flash server, but it may suit your purpose. And you should be able to use progressive download with your DSpace-archived content. If you do not have a streaming media server available, then I would recommend converting your video to Flash and use progressive download. I'm not intentionally promoting Flash, but here's a pretty good explanation of the differences: http://www.adobe.com/devnet/flash/articles/video_guide_02.html . Since, it looks like you're a Windows shop this may be helpful: http://www.microsoft.com/windows/windowsmedia/compare/webservvstreamserv.aspx Using a streaming media server offers better performance, but then your content delivery is typically separated from your archiving. You'll want to consider how or if you'll archive your video in DSpace if you're hosting it on streaming media server. Serving video is a frequent topic of conversation (see http://www.mail-archive.com/search?q=videol=dspace-tech%40lists.sourceforge.net) on the DSpace lists and there's no silver bullet. Also, NITLE, a non-profit DSpace service provider, recently offered a workshop on streaming media in DSpace: http://www.nitle.org/www/events/841-dspace-virtual-user-community-meeting-3 May be worth checking out. Jason -- Jason Stirnaman Digital Projects Librarian/School of Medicine Support A.R. Dykes Library, University of Kansas Medical Center [EMAIL PROTECTED] 913-588-7319 On 11/25/2008 at 12:37 AM, in message [EMAIL PROTECTED], [EMAIL PROTECTED] wrote: Hi! We would like to upload video files that are produced for the department and ideally we would like to archive into the Institution's established DSpace instance. The department's IT people are concerned that the size of the video files could cause a major problem with the government's internet traffic (eg cause an outage), especially if too many people attempt to access at the same time. We currently have one video file on DSpace which is in .wmv format. The .wmv format is not seen as being compact enough to minimise the impact of video files (in DSpace) on the government Internet. A suggestion from our IT person has been streaming HTML as it has a small footprint which would make it ideal for this exercise. I don't know what streaming HTML is and if it is recommended to work with DSpace. Is there someone out there who can enlighten me as to what streaming HTML is and if it will work in archiving video files in DSpace? Thanks very much. Ruby Lindberg Electronic Services Librarian Northern Territory Department of Health Community Services Northern Territory Government www.nt.gov.au/health PO Box 40596, Casuarina, NT 0811 Building 4, Royal Darwin Hospital, TIWI, NT 0810 [EMAIL PROTECTED] Ph: +61 8 8922 7913 Fax: +61 8 8922 Librarian on Call (DHCS staff) Library Catalogue eLibrary a new service replacing CROC for DHCS staff - login using your ePass username and password You can't direct the wind but you can adjust the sails.” P Please consider our environment before printing this e-mail - This SF.Net email is sponsored by the Moblin Your Move Developer's challenge Build the coolest Linux based applications with Moblin SDK win great prizes Grand prize is a trip for two to an Open Source event anywhere in the world http://moblin-contest.org/redirect.php?banner_id=100url=/ ___ DSpace-tech mailing list DSpace-tech@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/dspace-tech - This SF.Net email is sponsored by the Moblin Your Move Developer's challenge Build the coolest Linux based applications with Moblin SDK win great prizes Grand prize is a trip for two to an Open Source event anywhere in the world http://moblin-contest.org/redirect.php?banner_id=100url=/ ___ DSpace-tech mailing list DSpace-tech@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/dspace-tech
Re: [Dspace-tech] Video files in DSpace
Hi Ruby, you are pinpointing two important issues regarding offering online access to video files: 1) The video files, in wmv format are too large. As a result, downloading takes a long time for users and the process weighs on the available bandwidth (both at the user and server side) 2) An infrastructure might be unable to offer more than a certain number of simultaneous downloads. Using a streaming server video player is primarily a solution for the first issue. To offer new video's through your streaming server player, the files first need to be converted to a streaming format, for instance FLV (Flash Video). Flash Video files can be delivered in several different ways: - Streamed via RTMP to the Flash Player using the Flash Media Server, VCS, ElectroServer, Wowza Pro, WebORB for .NET or the open source Red5 server. - Progressive download via HTTP. This method uses ActionScript to include an externally hosted Flash Video file client-side for playback. However, unlike streaming using RTMP, HTTP streaming does not support real-time broadcasting. Streaming via HTTP requires a custom player and the injection of specific Flash Video metadata containing the exact starting position in bytes and timecode of each keyframe. Using this specific information, a custom Flash Video player can request any part of the Flash Video file starting at a specified keyframe. You can determine a fixed bitrate for the converted movies. This will mean that resolution and quality will be scaled down. An example bitrate is 600kb/sec (this is equal to 75kB/sec ... virtually any client broadband connection is able to view the files fluently. The biggest advantage for users, is that they are able to start viewing immediately, and that they are not required to wait until the full movie is downloaded. In addition to that, they are able to jump to a certain point on the video's timeline, and streaming will continue from there. To make the bridge to the second issue: multiple users viewing simultaneously always has an impact on the bandwidth, available to your server. But by using a streaming server viewer, the bandwidth requirements per client are fixed, while with normal downloading, one client could drain the bandwidth with very high download speeds. To make this clear through an example: If your server has a 100mbit bandwidth connection, you are able to support 170 simultaneous viewers. However, if you would offer the videos as downloadable files, and if you have users with 8mbit connections, this would mean that you would only be able to serve 12 clients, who are fully using their own 8mbit connections. If you are interested in implementing a streaming solution for your DSpace, @mire offers a DSpace add-on module for streaming video (and audio), please see http://atmire.com/audiovisual.php. Several streaming servers and players are possible but the most common setup is using a flash video player and the Adobe Streaming Server (for Flash video). with best regards, Bram Luyten Lieven Droogmans @mire NV Romeinse Straat 18 3001 Heverlee Belgium +32 2 888 29 56 http://www.atmire.com - Institutional Repository Solutions http://www.togather.eu - Before getting together, get [EMAIL PROTECTED] On Tue, Nov 25, 2008 at 7:37 AM, [EMAIL PROTECTED] wrote: Hi! We would like to upload video files that are produced for the department and ideally we would like to archive into the Institution's established DSpace instance. The department's IT people are concerned that the size of the video files could cause a major problem with the government's internet traffic (eg cause an outage), especially if too many people attempt to access at the same time. We currently have one video file on DSpace which is in .wmv format. The .wmv format is not seen as being compact enough to minimise the impact of video files (in DSpace) on the government Internet. A suggestion from our IT person has been streaming HTML as it has a small footprint which would make it ideal for this exercise. I don't know what streaming HTML is and if it is recommended to work with DSpace. Is there someone out there who can enlighten me as to what streaming HTML is and if it will work in archiving video files in DSpace? Thanks very much. Ruby Lindberg Electronic Services Librarian Northern Territory Department of Health Community Services Northern Territory Government www.nt.gov.au/health PO Box 40596, Casuarina, NT 0811 Building 4, Royal Darwin Hospital, TIWI, NT 0810 [EMAIL PROTECTED] Ph: +61 8 8922 7913 Fax: +61 8 8922 Librarian on Call (DHCS staff) Library Catalogue eLibrary a new service replacing CROC for DHCS staff - login using your ePass username and password You can't direct the wind but you can adjust the sails. P Please consider our environment before printing this e-mail - This SF.Net email is sponsored by the
[Dspace-tech] Video files in DSpace
Hi! We would like to upload video files that are produced for the department and ideally we would like to archive into the Institution's established DSpace instance. The department's IT people are concerned that the size of the video files could cause a major problem with the government's internet traffic (eg cause an outage), especially if too many people attempt to access at the same time. We currently have one video file on DSpace which is in .wmv format. The .wmv format is not seen as being compact enough to minimise the impact of video files (in DSpace) on the government Internet. A suggestion from our IT person has been streaming HTML as it has a small footprint which would make it ideal for this exercise. I don't know what streaming HTML is and if it is recommended to work with DSpace. Is there someone out there who can enlighten me as to what streaming HTML is and if it will work in archiving video files in DSpace? Thanks very much. Ruby Lindberg Electronic Services Librarian Northern Territory Department of Health Community Services Northern Territory Government www.nt.gov.au/health PO Box 40596, Casuarina, NT 0811 Building 4, Royal Darwin Hospital, TIWI, NT 0810 [EMAIL PROTECTED] Ph: +61 8 8922 7913 Fax: +61 8 8922 Librarian on Call (DHCS staff) Library Catalogue eLibrary a new service replacing CROC for DHCS staff - login using your ePass username and password You can't direct the wind but you can adjust the sails.” P Please consider our environment before printing this e-mail - This SF.Net email is sponsored by the Moblin Your Move Developer's challenge Build the coolest Linux based applications with Moblin SDK win great prizes Grand prize is a trip for two to an Open Source event anywhere in the world http://moblin-contest.org/redirect.php?banner_id=100url=/ ___ DSpace-tech mailing list DSpace-tech@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/dspace-tech
