I'm developing a player using action script 3. I want to add an option that allow users to increase or decrease the speed of the current video. How can I do that with NetStream?
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I'm interested in uploading a series of files to my web server and directing viewers to page which will autoplay the videos from a specific point dependent on the current time. My intention is to create the illusion of a live stream or actual TV channel, where they are unable to control the playback, but will return to the same point if they refresh the page.
I'm having difficulty finding answers, since it's descriptively so close to an actual webcast.
Here's my thought process on a solution.
Use the JavaScript Date Object API to capture the current time
Include your video with preload set to true, and controls false
Then use onLoad() and setup your video in JS
$(video).get(0).currentTime = XX; //You need an algorithm based on the time & length of video
$(video).get(0).play();
What I need to do is easy: the purpose of this test is show down the speed of my webcam when the camera capture a white pixel so:
1/ I create a Camera
this.cam = Camera.getCamera();
this.velocidad = 24; // I set up the fps in 24
this.cam.setMode(ancho,alto,velocidad);
vid = new Video(640,480);
vid.width = ancho;
vid.height = alto;
vid.attachCamera(cam);
addChild(vid);
2/ So now, when the pixel is recognized I need to change the current speed of the camera to 12 in order to slow down the user speed
I've tried with this code but the camera is frozen and nothing change.. I don't know if I have to delete the current instance of the camera and set up again with the disire fps
cam.setMode(640,480,12);
See Camera.setMode() to request a different frame rate, but note that what's available will depend on the camera.
I think this is not possible with just a config setting, property or method.
The possible solution would be to capture the cam and store its frames as bitmaps in and play (or render) them in sequence.
If this is not a commercial project, you can use this: http://code.google.com/p/flvrecorder/ to record and than load the video to play as you want.
Edit:
Here are some more links, since I can't code something for you now:
Post-processing captured video in AS3, creating slow motion
playing slow motion, fast forward , rewind in a video player in flash video player
Also, you can search Google for "as3 video slow" and it will give you more reference material and some examples.
I'm having some problems to start playing an external video file at determinate time.
I want to load an external mp4 or flv file and the player must start to play it at a determinate time ( ex at 100 second ). The same way of selecting a video part on the seek bar. But, using NetStream.seek, it will buffer all the video from 0 to selected second, then the video starts. But it have to start buffering to the given second time.
How can i do it ?
It should be supported by the server side, so syntax depends on the server, e.g. stream.play("file.flv?start=100000");
Btw there's a general advice that you should seek to unbuffered position only to a keyframe to avoid display of changes on a monochrome background instead of a keyframe. Information about keyframes' times and filepositions can be found it the video file metadata object
I'm on an AS3 project, playing a video (H264). I want, for some special reasons, to go to a certain position.
a) I try it with NetStream.seek(). There it only goes to keyframes. In my current setting, this means, i can find a position every 1 second. (for a better resolution, i'd have to encode the movie with as many keyframes as possible, aka every frame a keyframe)
this is definetly not my favourite way, because I don't want to reencode all the vids.
b) I try it with NetStream.step(). This should give me the opportunity to step slowly from frame to frame. But in the documentation it says:
This method is available only when data is streaming from Flash Media Server 3.5.3 or higher and when NetStream.inBufferSeek is true.
http://help.adobe.com/en_US/FlashPlatform/reference/actionscript/3/flash/net/NetStream.html#step()
Does this mean, it is not possible with Air for Desktop? When I try it, nothing works.
Any suggestions, how to solve this problem?
Greetings & Thank you!
Nicolas
Flash video can only be advanced by seconds unless you have Flash Media Server hosting your video. Technically, that means that you can have it working as intended in Air, however, the video would have to be streaming (silly adobe...).
You have two options:
1) Import the footage as a movieclip. The Flash IDE has a wizard for this, and if you're developing exclusively in non-FlashIDE environment, you can convert and export as an external asset such as an SWF or SWC. This would then be embedded or runtime loaded into your app giving you access to the per-frame steppable methods of MovieClip. This, however, does come with some audio syncing issues (iirc). Also, scrubbing backwards is not an MC's forté.
2) Write your own video object that loads an image sequence and displays each frame in order. You'd have to setup your own audio syncing abilities, but it might be the most direct solution apart from FLVComponent or NetStream.
I've noticed that flash player 9 scrubs nice and smooth but in players 10+ I get this no scrub problem.
My fix, was to limit frequency the calls to the seek function to <= 200ms. This fixed scrubbing but is much less smooth as player 9. Perhaps because of the "Flash video can only be advanced by seconds" limitation? I used a timer to tigger the function that calls seek() for the video.
private var scrubInterval:Timer = new Timer(200);
private function videoScrubberTouch():void {
_ns.pause();
var bounds:Rectangle = new Rectangle(0,0,340,0);
scrubInterval.addEventListener(TimerEvent.TIMER, scrubTimeline);
scrubInterval.start();
videoThumb.startDrag(false, bounds);
}
private function scrubTimeline(e:TimerEvent):void {
var amt:Number = Math.floor((videoThumb.x / 340) * duration);
trace("SCRUB duration: "+duration+" videoThumb.x: "+videoThumb.x+" amt "+amt);
_ns.seek(amt);
}
Please check this Demo link (or get the SWF file to test outside of browser via desktop Flash Player).
Note: Demo requires FLV with H.264 video codec and AAC or MP3 audio codec.
The source code for that is here: Github link
In the above demo there is (bytes-based) seeking and frame by frame stepping. The functions you want to study mainly are:
Append_SEEK ( position amount ) - This will got to the specified position in bytes and search for the nearest available keyframe.
get_frame_TAG - This will extract a tag holding one frame of data. Audio can be in frames too but lets assume you have video-only. That function is your opportunity to adjust timestamps. When it's run it will also append the tag (so each "get_frame_TAG" is also a "frame step").
For example : You have a 25fps video, you want the third-frame at 4 seconds into playback...
1000 milisecs / 25 fps = 40 units for each timestamp. So 4000 ms == 4 secs + add the 40 x 3rd frame == an expected timestamp of 4120.
So getting that frame means... First find a keyframe. Then step through each frame checking the timestamps that represent a frame you want. If it isnt then change it to the same as most recent keyframe timestamp (this forces Flash to fast-forward through the frames to keep things in sync as it assumes the frame [with smaller than expected timestamp] should have been played by that time). You can "hide" the video object during this process if you don't like the look of fast-forwarding.
I have two flash movies, on different tabs of a user's browser.
They use LocalConnection to talk to each other, but the one on the tab which isn't active doesn't do anything until you switch back to that tab, can you change this? Maybe in the embed tag?
One of the things that Adobe changed about the Flash player after 10.1, in order to make it consume less CPU cycles was to force the player to only execute at 2fps (or some other ridiculously low amount) when the swf is no longer in focus (or even if it's still "in focus" but not being rendered to the screen by virtue of being in a section of the browser window that's scrolled offscreen.
I'm not aware of anything inherent to the new Flash player that would prevent LocalConnection from working, though. Do you have listeners set up to detect whether the swfs in question are active or not before they attempt to make any calls?