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.
Related
With the help of waveformjs.org I am able to draw waveform for a mp3 file. I can also use
wav2json to get json data for audio file hosted on my own server and I don't have to depend on soundcloud for that. So far so good. Now, the next challenges for me are
To fill the color in waveform as the audio playing progresses.
On clicking anywhere on waveform audio should start playing from that point.
Has anyone done similar? I tried to look into soundcloud js SDK but no success. Any pointers in this directions will be appreciated, thanks.
As to changing the color my earlier answer here may help:
Soundcloud modify the waveform color
As to moving the position when you click on the waveform you can do something like this:
Assuming you have a x position already from the click event adjusted relative to the canvas.
/// get a representation of x relative to what the waveform represents:
var pos = (x - waveFormX) / waveformWidth;
/// To convert this to time, simply multiply this factor with duration which
/// is in seconds:
audio.currentTime = audio.duration * pos;
Hope this helps!
Update
The requestAnimationFrame is optimized not only for performance but also power consumption as more and more users are on mobile devices. For this reason the browsers may or may not pause or reduce frame rate of rAF when in a different tab or when browser tab is invisible. This can cause a position based approach to render the waveform delayed or not at all when tab is switched.
I would recommend to always use a time based approach so neither FPS or other behavior will interrupt the drawing of the waveform.
You can force the waveform to be updated at the actual current time as luckily we can attach this to the currentTime property of the audio element.
In the rAF loop simply update the position like this using a "reversed" formula of the above:
pos = audio.currentTime / audio.duration * waveformWidth + waveformX
When the tab becomes visible again this approach will make sure the waveform continues based on the actual time position of the audio.
I have this code for my volume slider:
var stVolume:SoundTransform=new SoundTransform();
slider.addEventListener(SliderEvent.CHANGE,volslider);
function volslider(ev:SliderEvent):void
{
stVolume.volume=(ev.value/100);
sch1.soundTransform = stVolume;
}
I have many frames with different sound channels. How can I call this function with specific sound channels in each frame like shc2, sch3 and others instead use repeatedly all of function?
Is it possible send SoundChannel name whit eventListener for example:
slider.addEventListener(SliderEvent.CHANGE,volslider(/*something i don't know*/,sch10));
An AudioSource is attached to a GameObject for playing back sounds in a 3D environment. In order to play 3D sounds you also need to have a AudioListener. The audio listener is normally attached to the camera you want to use. Whether sounds are played in 3D or 2D is determined by AudioImporter settings.
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'm building a webcam recording app in CS5 and I'm having some seemingly random issues with the recorded flv. Currently I'm publishing a stream to Wowza Media Server using the standard _netstream.publish("movieName", "record") command. Everything regarding this works fine and I can play the file back but sometimes there's a 3 to 4 second pause at the beginning or end of the video. There will be a still frame and the time will sit at 0 and then snap to 4. I've explored bandwidth options and I've turned the resolution and quality down considerably and it doesn't seem to have any effect and the rest of the video will play back smoothly. Here are my current camera and mic settings.
_cam.setMode(160, 120, 30, false);
_cam.setQuality(0, 88);
_cam.setKeyFrameInterval(30);
_mic.rate = 11;
I'm also flushing the buffer before closing out the publish stream
_netstream.publish('null');
Could there be something going on with camera initialization/deactivation that causes the lag?
Any help would be greatly appreciated. Let me know if you need more details
I believe this has something to do with the way that the Flash plugin itself initializes and displays the camera.
If you set up a simple test to try setting and unsetting the video stream:
var cam:Camera = Camera.getCamera();
var webcam:Video = new Video(500, 375);
addChild(webcam);
var isPaused:Boolean = false;
function showWebcam():void {
if (!isPaused) {
cam = null;
} else {
cam = Camera.getCamera();
}
webcam.attachCamera(cam);
isPaused = !isPaused;
}
pausingButton.addEventListener(MouseEvent.CLICK, showWebcam);
You'll notice a definite pause as it switches between the two states.
From what I've seen, every time I call attachCamera() with a video object, there is a noticeable pause of the Flash Player itself (including all tweens, interactions, everything) when the method is called, even if the object I'm attaching is null.
Four seconds seems like an excessive lag, but I have noticed that the larger the input/video render and with smoothing = true set on the video object can affect the length of the delay.
As for a solution; I'm not sure if there is one achievable via pure Actionscript, since the delay appears to be down to how the Flash Player itself initializes and renders the live video object.
I want to create a swf or air app that takes an input and displays a graphic representation of it.
The graphic side is fine for the moment, but its always using an mp3 for example
var sound:Sound = new Sound (new URLRequest("myMP3.mp3"));
- i want it to be able to take a 'live' audio feed. How would I do that and is there a better way than using the microphone input?
thanks
dai2
Microphone input is probably the easiest way and using flash player 10.1 or AIR 2.0 you can do this. Take a look at http://www.adobe.com/devnet/air/flex/articles/using_mic_api.html
It's not as easy as using SoundMixer.computeSpectrum but offers the possibility (+ more). You'll for instance most likely want to run the data through FFT to use in visualization