Is it possible to use data URIs in video and audio tags?
Assuming the following:
- The browser in question doesn't lim开发者_运维问答it the size of data URIs.
- There is actually a purpose to doing this (so please refrain from asking "what's the point?" and "you do realize base64 encoding will expand your file by 33%, right?").
Is it technically possible to encode an entire video or audio file into base64, and embed it in an HTML document using either <audio> or <video>?
These are my test results. I'll try with Ogg as well if prompted.
Legend
- W = Wave, WD = Wave with base64 encoded data:uri
- M = MP3, MD = MP3 with base64 encoded data:uri
Test results
- Chrome 6.0.472.55: M, MD (no wave)
- Firefox 3.6: W, WD (no mp3:s)
- Firefox 4.0b1: W, WD (no mp3:s)
- iPad iOS 3.2: W, M (no data:uri)
- iPhone iOS 4: W, M (no data:uri)
- Opera 10.62: W, WD (no mp3:s)
- Safari 5.0.1: W, WD, M, MD
IE9 supports this, but only for file formats it supports. For instance, it works for MP3 files but it will not work for WAV files. Tried http://www.themaninblue.com/experiment/JS-909/ and the following test:
<!DOCTYPE html>
<html>
<head>
</head>
<body>
<audio controls="controls" autobuffer="autobuffer" autoplay="autoplay">
<source src="data:audio/wav;base64,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" />
</audio>
</body>
</html>
It should be possible, except in IE8 and below, which does not support Audio/Video elements. Note that Opera does limit the size of the URI.
That's probably because IE9 doesn't support WAV format in its audio element. Only MP3 is supported by now. I really hope that they change that in the RTM version.
For what it's worth, I was able to get a large (14mb) mp4 uuencoded and playing as a data uri in OSX Safari, but not Chrome. Still have more testing to do with smaller chunks, once I find some.
Also worth checking out the HTML5 MediaSource API. It's not widely supported yet, but allows for appending arbitrary bytes for media playback.
http://html5-demos.appspot.com/static/media-source.html
As of 2022 I ran into file size limits with Firefox (v100.0) when using dataURI versions of podcast MP3s that were above about 30 minutes long or about 20MB.
Invalid URI. Load of media resource data:audio/mpeg;base64,...
Converting the FileReader result to binary and then a Blob as described here solved the issue.
加载中,请稍侯......
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