mathiasbynens
/ deterministic-math-random.js
Last active
July 22, 2024 16:40
Here’s a 100% deterministic (predictable) alternative to `Math.random`. Useful when benchmarking.
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| // Here’s a 100% deterministic alternative to `Math.random`. Google’s V8 and | |
| // Octane benchmark suites use this to ensure predictable results. | |
| Math.random = (function() { | |
| var seed = 0x2F6E2B1; | |
| return function() { | |
| // Robert Jenkins’ 32 bit integer hash function | |
| seed = ((seed + 0x7ED55D16) + (seed << 12)) & 0xFFFFFFFF; | |
| seed = ((seed ^ 0xC761C23C) ^ (seed >>> 19)) & 0xFFFFFFFF; | |
| seed = ((seed + 0x165667B1) + (seed << 5)) & 0xFFFFFFFF; |
MrOrz
/ fbidinject.js
Created
April 18, 2012 11:36
This bookmart script adds fbid of each post in facebook into the selector button on the top-right of each post.
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| (function(){ | |
| var elems = document.querySelectorAll('.uiUnifiedStory.uiStreamStory.genericStreamStory'); | |
| for(var i = 0; i < elems.length; ++i){ | |
| var el = elems[i], a = el.querySelector('.uiSelectorButton.highlightSelectorButton'); | |
| if(!a){continue;} | |
| a.href = JSON.parse(el.dataset.ft).fbid; | |
| } | |
| return false; | |
| }()) |
yellowled
/ ffmpeg-html5
Created
December 6, 2011 19:39
Convert videos to proper formats for HTML5 video on Linux shell using ffmpeg. Will probably convert this to a bash script later, but for the time being, here's some examples. Not sure there have actually sensible dimensions and bitrates for web video.
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| # webm | |
| ffmpeg -i IN -f webm -vcodec libvpx -acodec libvorbis -ab 128000 -crf 22 -s 640x360 OUT.webm | |
| # mp4 | |
| ffmpeg -i IN -acodec aac -strict experimental -ac 2 -ab 128k -vcodec libx264 -vpre slow -f mp4 -crf 22 -s 640x360 OUT.mp4 | |
| # ogg (if you want to support older Firefox) | |
| ffmpeg2theora IN -o OUT.ogv -x 640 -y 360 --videoquality 5 --audioquality 0 --frontend |