I am embedding Youtube videos in a web site but sometimes (it is not a deterministic error, sometimes everything works fine, sometimes not) instead of the youtube preview image, only a white square is rendered.
If I inspect the element, I can see that actually there is a tag IMG with the correct SRC attribute, and if I navigate this URL I get the correct image.
Is there any reason why I get the white square in the web site?
Thanks,
Stefano
Related
I am using a capture handler to download a PNG image for a selector. URL is working fine when loaded individually, but the image downloaded is not showing the opacity of some of the elements in it, even when the dpi is given as 192. Am using bootstrap opacity classes("opacity-8")
Tried to debug using debug parameter, but It didn't work. Is there a way that I can debug it more closely or a way to see the exact application page used while capturing?
Tried to overlay a div with faded color, but it is not working too.
I'm working on a photography website in which full resolution photos can be uploaded but full-res should not be able to be displayed/accessed (download of the full res will take place through a token.)
I've tried the "restrictTo" setting but resolutions need to not be reliant on specified dimensions.
Is there a way to have myphoto.jpg by default without a querystring display at for example 700x700 yet still have the full resolution file available through a token download? Pretty much, an image without a querystring is still processed by Imageprocessor but with a default resize rule.
I can request an image with a native width of 5000px by myphoto.jpg?width=1400 but the resulting image is the full 5000px width image, why doesn't the max width 1400px image serve up?
If you are getting the full image back it means something has gone wrong. (You've probably ran out of contiguous memory) so make sure you're in 64bit mode.
maxWidth restricts the resize param to an upper limit only. So does nothing on it's own.
What you are probably looking for is the ValidatingRequest event
http://imageprocessor.org/imageprocessor-web/imageprocessingmodule/#events
I would first set ImageProcessor.Web to intercept all image requests in the processing.config file by changing the interceptAllRequests property. That will ensure you capture any attempts to view the image without a token.
In the event you can cancel the request and also alter/add any querystring parameters to limit your size transparently without showing the querystring to the end user.
I would use a query string for the image.
url?width=1400&height=900&mode=crop&anchor=center
I would also use a lazy load so the page loads faster with small blurry images and then afterwards replaces them all with the full res or querystring for max size you want to display at.
I wrote a script for this.
http://www.codeshare.co.uk/blog/lazy-loading-images/
Also on my site now, when I upload an image, I automatically resize it down to 1080p resolution when it saves. So I can upload a massive image and not have to worry about resizing it first or it taking up too much space on my server.
Here's the code for that too
http://www.codeshare.co.uk/blog/automatically-resize-your-media-images-in-umbraco/
Well, here is my problem.
I'm developing the front end of a website using rails. and I'm using svg images. If you go to http://de-regalos-qa.herokuapp.com/products/9 you would see an image with cards (visa, mastercard, etc) this image looks like transparent or with a very light opacity but if you download the image you would see the image with the original colors. This only happens with chrome and firefox but not with safari. This happens only with two of the images from all my site. I dont understand why.
Chrome screenshot:
An application I'm working on needs to get HQ YouTube thumbnails given a URL. Using this answer, I tried using the maxresdefault.jpg to get the maximum resolution of the thumbnail but on some videos (seemingly random), the request 404's.
Here are some examples:
http://img.youtube.com/vi/zIez5QVE3NI/maxresdefault.jpg works
http://img.youtube.com/vi/DaAfe5xTm8w/maxresdefault.jpg doesn't work
Using the same URL's, other requests using the same video keys do work:
http://img.youtube.com/vi/zIez5QVE3NI/default.jpg works
http://img.youtube.com/vi/DaAfe5xTm8w/default.jpg works
Why doesn't maxresdefault.jpg reliably return the image? Both of those videos are public and can be embedded.
I'd use 0.jpg but it has black bars on the top and bottom of the image.
As I understand it, YouTube only generates high-res stills for high-res videos. The first one you link was uploaded at a resolution of at least 1080p, while the second was less than 720p.
Looks like the only thing you can do is pull the video feed, check that to see if a high-res still has been generated and up-scale the smaller one yourself if not.
All¹ YouTube stills are presented in the 4:3 aspect ratio, so will always have black bars at the top and bottom if the video is 16:9. In HTML/CSS, this is easily combated by setting the image as the background of a div and sizing the div to the correct aspect.
¹ Except the mqdefault.jpg stills, which are all in 16:9 aspect (320x180)
Update 2015 :
None of your 'maxresdefault' link seems to be working
Try these:
http://img.youtube.com/vi/<insert-youtube-video-id-here>/0.jpg
http://img.youtube.com/vi/<insert-youtube-video-id-here>/1.jpg
http://img.youtube.com/vi/<insert-youtube-video-id-here>/2.jpg
http://img.youtube.com/vi/<insert-youtube-video-id-here>/3.jpg
Update 2019 ::
https://i.ytimg.com/vi/<insert-youtube-video-id-here>/hqdefault.jpg
Seems to return highest possible image....
1.jpg, 2.jpg, 3.jpg return previews through the length of the clip which are handy also ;)
Last time I saw someone asks why Safari on iPad doesn't show some 1920x1440 jpeg with real size & I solved that puzzle. You have to use a progressive-encoded jpeg. However, I find another different problem.
Say, demo.jpg is a progressive-encoded jpeg with 2000x3000 & I upload it to my website. I then access it via url ...demo.jpg, Safari will show it with 2000x3000 size, perfect.
Now I make a most-simple html file named mypic.html. This html has only img tag with src=demo.jpg or src=demo.jpg width=2000 height=3000 inside body. Now I access it via url ...mypic.html. This time Safari show a very small icon of a question mark?
Does anybody know why the latter case fail?
The problem is about the memory available to Safari. The total amount of RAM is just 256MB, and Safari stops showing the image of much smaller size. You need to scale them down.