I will add these as simple text boxes ( span) with a monospace font, to give it the “techy” look. However, it is still missing typical information, such as the recording indicator, frames per second, video resolution and recording time. I think that upon first glance, the above picture already reminds one of a video camera. Width: 100 % /* make this element same size as the wrapper */ height: 100 % Width: 720 px /* same size as the image */ height: 480 px In this case, I will use a static image to showcase the effect, but it works the same for a video element. Thus, next step is to figure out how to put this on top of another HTML element - a video, an image or anything else. So far so good, but this is supposed to be an overlay. You can read more about CSS variables (formally “CSS Custom Properties”) on MDN. I’m using CSS variables here to avoid repeating the values of various properties over and over again, instead I can just update them in one place. Thus, in order to move the borders a bit inwards, we need to manually specify the position (top-left element is at position (x=20,y=20) etc.). The parent overlay element has four child elements, each of them has its own class, because we need to individually address each of them in order to set the proper borders (the top-left element has borders only on the left and top side etc.).īecause the position of the child elements is absolute, setting a padding on the parent will no longer work. Width: 150 px /* controls the length of the borders */ height: 100 px /* controls the height of the borders */ This works by setting the parent element to position: relative and position: absolute for the child elements. Therefore, I decided to use four individual elements and put them in the corner of the parent element. This is an elegant way of solving the problem, but does not fit my use case because then I cannot put any text into the corners. On StackOverflow, someone came up with a really clever way of doing corner-only borders with ::before and ::after pseudo-elements. The problem with this approach is that the borders will be all around the element (not just in the corners) and there is no way to influence that. To put a CSS border inside of an element (instead of around it), you can use the box-shadow property. duration), I came to the conclusion that just using HTML is a better fit. I also considered creating a vector graphic (SVG) for this purpose, however since I want to dynamically update the overlay content (e.g. In this post I will outline my journey to creating such an overlay with HTML and CSS. To indicate that the recording is active, I wanted to add an overlay that you typically see on a video camera: “□ REC”, duration etc. While this video is recorded, it also directly shown to the user on the webpage. Either that or get zma to write the images back, but there's no guarantee that zms would not already have got the original image out by then.For one of the recent features of U9K.de, I am recording video from the user’s webcam or screen. To view 'live' highlighted images (which I admit is a cool feature, though I'm not sure how useful) would require a secondary buffer maintained by zma which zms could dip into whenever it had something to look at. So the highlighted images are not actually stored anywhere except in the files. The only thing that puts them in there is the capture daemon, the analysis daemon reads them out as zms does. The problem basically is that zms gets the images from the shared memory buffers. Jameswilson wrote:Phil did you look into the possibilty of having the recorder not record these frames but zms send them If passed in url)
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