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how-to-make-a-frame-video-javascript How to make a frame video javascript is Desktop AR? Then addEventListener is called to begin watching the video element so that we obtain notification when the user presses the play button on the video. The first type is a directional light placed somewhere on the scene while the second one reflects the light from the first type, so it looks more natural; this can be set globally. Cause The problem is that seeking video by setting it's currentTime is asynchronous. Mozilla's A-Frame framework provides a markup language allowing us to build 3D VR landscapes using a system familiar uow web developers, which follows game development coding principles; this is useful for quickly and successfully building prototypes and demos, without having to write a lot of JavaScript or GLSL. Home Web Make A Photo Frame Video Javascript Design Tutorials Learning to create frames. Lets see what happens if we defined the rows first, instead of the other way round:.

I want to capture a frame from video every 5 seconds. This is my JavaScript code: video. Improve this question. Lin Lin 1 1 gold badge 7 7 silver badges 17 17 bronze badges. What is theCanvas on your generateThumbnail function?

Can How To Make A Frame In Javascript Query you please provide the html tags for this question to be more useful? I'm trying to do the same thing but I'm not sure how theCanvas should be declare on the page. Hi Lin, do you still have source code for this question you asked?

Add a comment. Active Oldest Votes. Cause The problem is that seeking video by setting it's currentTime is asynchronous. Solution By re-writing the code a little you can use the seeked event to go through the video to capture the correct frame as this event ensures us that we are actually at the frame we requested by setting the currentTime property. Improve this answer.

I tried using your code. Now I have another problem. Because of seeked, when I seeked the video by clicking at timeline, the image is generated as well.

But I don't want that. Edit I solved this problem already. Thank you. Matian no, unfortunately — Michael Feb 1 '17 at There are always chance for false positives but it can reduce number of different thumbs if that is a goal or use a longer interval depending on the purpose. Show 3 more comments. Sign up or log in Sign up using Google. Sign up using Facebook.

Sign up using Email and Password. Post as a guest Name. Email Required, but never shown. These will be used when we're actually doing the chroma-keying effect. Then addEventListener is called to begin watching the video element so that we obtain notification when the user presses the play button on the video.

In response to the user beginning playback, this code fetches the width and height of the video, halving each we will be halving the size of the video when we perform the chroma-keying effect , then calls the timerCallback method to start watching the video and computing the visual effect.

The timer callback is called initially when the video starts playing when the "play" event occurs , then takes responsibility for establishing itself to be called periodically in order to launch the keying effect for each frame. The first thing the callback does is check to see if the video is even playing; if it's not, the callback returns immediately without doing anything. Then it calls the computeFrame method, which performs the chroma-keying effect on the current video frame.

The last thing the callback does is call setTimeout to schedule itself to be called again as soon as possible. In the real world, you would probably schedule this to be done based on knowledge of the video's frame rate. The computeFrame method, shown below, is responsible for actually fetching a frame of data and performing the chroma-keying effect.

When this routine is called, the video element is displaying the most recent frame of video data, which looks like this:. In line 2, that frame of video is copied into the graphics context ctx1 of the first canvas, specifying as the height and width the values we previously saved to draw the frame at half size.

Note that you can pass the video element into the context's drawImage method to draw the current video frame into the context. The result is:. Line 3 fetches a copy of the raw graphics data for the current frame of video by calling the getImageData method on the first context. This provides raw bit pixel image data we can then manipulate.

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