Yout bitmap data image first would require some compression, on Tinic
Uro's blog there is a example for that. But how to bring it to the
server ? Would encapsulate it into AMF and send it over RTMP work ? I
think that is not possible, but I hope I am wrong. And using binary
sockets you need to wait a year until 80 % of the people out there can
use it (flashplayer 9)
On 6/29/06, Nathan P. Johansen <[EMAIL PROTECTED]> wrote:
> I think this request approaches the problem in reverse. Unless you know
> exactly where the playhead of the FLV should be, then how do you request
> a bitmap image of it? Moreover, this is easier to capture on the client
> side than to generate on the server side - however capturing it on the
> client side doesn't seem to have any novel way of then storing that back
> on the server for future reference.
>
> For example, drag an instance of the FLV Playback component to the stage,
> and name it "myPlayBack". In the ActionScript on frame 1, import these
> methods, and create a listener object:
>
>
> import mx.video.*;
> import flash.display.BitmapData;
> import flash.geom.Matrix;
>
> var listenerObject:Object = new Object();
>
>
> Create a container for the "captured" frame of the FLV, and place it
> somewhere on the stage, and reduce it to a thumbnail by scaling it to 25%,
> like this:
>
>
> this.createEmptyMovieClip("holder_mc", this.getNextHighestDepth());
>
> holder_mc._xscale = 25;
> holder_mc._yscale = 25;
> holder_mc._x = 200;
> holder_mc._y = 200;
>
>
> When metadata on the FLV is received, use a listener object to setup the
> initial "captured" frame for the "holder_mc" image by setting its width
> and height to match that of the FLV metadata:
>
>
> listenerObject.metadataReceived = function(eventObject:Object):Void {
> myBitmap = new BitmapData(myPlayBack.preferredWidth,
> myPlayBack.preferredHeight, true, 0x00FFFFFF);
> holder_mc.attachBitmap(myBitmap, 1);
> };
> myPlayBack.addEventListener("metadataReceived", listenerObject);
>
>
> Next, by using another listener object to sense when the state of the FLV
> playback changes - like seeking to a different playheadTime or pausing the
> playback - then we can "capture" that frame of the FLV and draw it to
> "myBitmap" which will reflect in the "holder_mc" instance:
>
>
> listenerObject.stateChange = function(eventObject:Object):Void {
> myBitmap.draw(myPlayBack);
> };
> myPlayBack.addEventListener("stateChange", listenerObject);
>
>
> Finally, load in the clip to "myPlayBack" by giving it a content path to
> the FLV:
>
>
> myPlayBack.contentPath = "/mysite/myvideo.flv";
>
>
> Now then, wouldn't it be interesting to be able to take the contents of
> "holder_mc" - on demand - and save that entire object on the server as a
> marker that includes which FLV and the playheadTime it was captured from?
>
> Then it would be useful as a method for allowing people to see marker
> points in otherwise long FLV files so that they can more quickly jump to
> that point in the playback - using the captured "thumbnail" as a visual
> reference. These markers could be created by someone familiar with the
> content - like a teacher who has produced a lecture that has several
> important segments - or it could be used for a student to bookmark points
> of interest or to mark their progress so they can return to it later.
>
> When the student returns to the site later, their saved markers can be
> loaded and displayed. Or they can work from the standard ones that mark
> important segments of the FLV. Even allowing collaboration for groups to
> share their marked points, along with notes or commentary attached to
> them, would allow for some interesting possibilities.
>
> Just some thoughts. I don't know how to go about saving the "holder_mc"
> object anywhere so that it is persistent and can be used again. If anyone
> does know how, it would be helpful to know. I imagine it would involve
> shared objects. =)
>
>
> Nathan
>
>
>
> On Thu, 29 Jun 2006, Ronnie Brito wrote:
>
> > "And another feature-request: Is it possible to request a jpg or another
> > screenshot of the flv from the server? and force the browser to download
> > the screenshot?"
> >
> > this would be a very usefull function
> > could be used on whiteboard applications too
>
>
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>
--
Roberto Saccon
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