Create thumbnail from video file via file input

I am attempting to create a thumbnail preview from a video file (mp4,3gp) from a form input type=’file’. Many have said that this can be done server side only. I find this hard to believe since I just recently came across this Fiddle using HTML5 Canvas and Javascript. Thumbnail Fiddle The only problem is this … Read more

PIL: Thumbnail and end up with a square image

Calling image = Image.open(data) image.thumbnail((36,36), Image.NEAREST) will maintain the aspect ratio. But I need to end up displaying the image like this: <img src=”/media/image.png” style=”height:36px; width:36px” /> Can I have a letterbox style with either transparent or white around the image? Answer PIL already has a function to do exactly that: from PIL import Image, … Read more

What is the ARM Thumb Instruction set?

under “The Thumb instruction set” in section 1-34 of “ARM11TechnicalRefManual” it said that: “The Thumb instruction set is a subset of the most commonly used 32-bit ARM instructions.Thumb instructions are 16 bits long,and have a corresponding 32-bit ARM instruction that has the same effect on processor model.” can any one explain more about this especially … Read more

Getting a thumbnail from a video url or data in iOS

I am trying to acquire a thumbnail (of the first frame) from a video taken from iphone 3GS camera so I can display it. How to do this? Answer -(UIImage *)generateThumbImage : (NSString *)filepath { NSURL *url = [NSURL fileURLWithPath:filepath]; AVAsset *asset = [AVAsset assetWithURL:url]; AVAssetImageGenerator *imageGenerator = [[AVAssetImageGenerator alloc]initWithAsset:asset]; imageGenerator.appliesPreferredTrackTransform = YES; CMTime time … Read more

What is the difference for sample/resample/scale/resize/adaptive-resize/thumbnail operators in ImageMagick convert?

I found multiple ways to change the resolution of an image using convert: -sample -resample -scale -resize -adaptive-resize -thumbnail What’s the difference of those? If I need to make various size large picture thumbnail with fixed aspect ratio (cropping needed) — what’s my best choice? Answer resize -resize 400×300+20+30 (like the -scale and -sample examples … Read more

Create thumbnail image

I want to display thumbnail image in a gridview from file location. How to generate that of .jpeg file? I am using C# language with asp.net. Answer You have to use GetThumbnailImage method in the Image class: https://msdn.microsoft.com/en-us/library/8t23aykb%28v=vs.110%29.aspx Here’s a rough example that takes an image file and makes a thumbnail image from it, then … Read more