![javascript html5 video to mp4 javascript html5 video to mp4](http://talkerscode.com/webtricks/images/custom_video_player.jpg)
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JAVASCRIPT HTML5 VIDEO TO MP4 CODE
![javascript html5 video to mp4 javascript html5 video to mp4](https://dev.opera.com/articles/html5-video-flash-fallback-custom-controls/html5-video-basic.jpg)
JAVASCRIPT HTML5 VIDEO TO MP4 HOW TO
At some point I came up with the idea to use Electron and led to Electron Recorder, which looked promising, but didn’t work.Ī bit more searching led me to PhantomJS, which is not developed anymore, but there was some explanation how to dump frames using phantomjs and merge them using ffmpeg, very similar to the above.
![javascript html5 video to mp4 javascript html5 video to mp4](https://www.dvdvideosoft.com/img2/guides/free-html5-video-player-and-converter_2big.png)
Simply searching for “convert html to mp4” doesn’t give a lot but web services, often paid for. For similar problems, it usually takes me about 5min of googling and a bit of scripting, but this time, it was actually a long way. It was actually more complicated than normal. With that very simple and quick invocation a nice leader video was ready! History crf is the video quality, and -pix_fmt the pixel format. Also the -viewport and -s values should better agree. The -r is the fps, so needs to agree with the -fps above.
![javascript html5 video to mp4 javascript html5 video to mp4](https://miro.medium.com/max/1400/1*BZYp-WYALwMjly8o2y9-dA.png)
Timesnap Leader.html -viewport=1920,1080 -fps=30 -duration=10 -output-pattern="leader-%03d.png"įollowed by conversion of the various png images to an mp4:įfmpeg -r 30 -f image2 -s 1920x1080 -i leader-%03d.png -vcodec libx264 -crf 25 -pix_fmt yuv420p leader.mp4 I decided to render at 30fps, which left me with the simple invocation: In our case, we wanted our leaders to last 10secs before the actual presentation video starts. So having an html file available, with all the necessary assets, either online or local, one simply creates enough single screenshots per second so that they can be assembled later on into a video with ffmpeg. This also means that rendering quality is very high. It is actively maintained, and internally uses puppeteer, which in turn uses Google Chrome browser headless. The key is to use timesnap, a tool to take screenshots from web pages. At the end (below I will give a short history) it turned out to be rather simple. Searching the internet it turned up mostly web services, some of them even with lots of money to pay. We were just put before this problem for the TUG 2020 online conference. Such an obvious problem, convert a piece of html/js/css, often with animations, to a video (mp4 or similar).