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javascripthtmlvideohtml5-videoreadystate

html5 video wait for readystate == 4 after setting currentTime

I'm trying to grap some images of a video that is not played. Therefore I use the HTML5 .

Because I want to grab images that haven't been played, I set

video.currentTime = y;

If I now call the grap function it won't work. Because the video.readyState is 1 (and not 4). If I add at the beginning of the grab function an alert(); it works.

I tried to loop until readyState == 4 with

while(true){
   if(video.readyState == 4){
       grapImage();
   }
}

but this ends up in an endless loop.

So how can I wait until readyState == 4?

Thanks

Solution

  • Ok I solved it with the event listener seeked.

    If you change the current time it changes to seeking once it's finished it goes to seeked. The loadedmetadata event is also an option, but seeked is the fastest one.

    Thanks for your help.