Difference between revisions of "Courses/Design & Technique-Essential Web Design/Q2/06"
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== preparing your video files== | == preparing your video files== | ||
<span style="background:yellow">'''To be certain that your videos will play in all current browsers, you'll need to have videos in both .mp4 and .ogv container formats.'''</span> <ref name="formats"> Read more on browsers' supported formats in https://developer.mozilla.org/en-US/docs/Web/HTML/Supported_media_formats</ref> | |||
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| Internet Explorer, Chrome, Safari | | Internet Explorer, Chrome, Safari | ||
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== video codecs and containers explained== | == video codecs and containers explained== | ||
Revision as of 13:35, 2 January 2016
audio and video in HTML5
HMTL5 includes a standard way to embed audio and video tags, without the use of flash. It playing audio and video quite easy and opens up a lot of possibilities audio-visual interaction and manipulation.
Let's see how.
preparing your video files
To be certain that your videos will play in all current browsers, you'll need to have videos in both .mp4 and .ogv container formats. [1]
| Royalty Free | Patented | |
|---|---|---|
| Codec & containers | Theora(video) + Vorbis(audio) > .ogv | H.264 (video) + AAC or MP3 (audio) > .mp4 |
| Browsers | Firefox, Chrome, Opera | Internet Explorer, Chrome, Safari |
video codecs and containers explained
Video files such as .avi .mp4 .ogv .mkv are container formats. Like a .zip file which contains other files within it, video container formats define how to store video and audio streams within them. [2]
Each video container allow specific audio and video codecs.
A codec defines the way (the algorithm) by which a audio or video stream is encoded and decoded. [3]
video codes
H264
- can be embedded in mp4 container
- is patent-encumbered
Theora
- can be embedded in any codec, but is most common in .ogv container
- royalty-free
audio codecs
MP3
- number of channels: 1 or 2 [4]
- possible bitrates: 64 kbps, 128 kbps, 192 kbps
- is patent-encumbered
- Also known as MPEG-1 Audio Layer 3.
AAC
- is patent-encumbered
- number of channels: up to 48
- Also known as Advanced Audio Coding
Vorbis
- can be embedded in .ogg (also .mp4, .webm, .mkv) containers
- royalty-free
- number of channels: any
prepare your files
As said previously: To be certain that your videos will play in all current browsers, you'll need to have videos in both .mp4 and .ogv container formats. In other words you need to encode your videos into these 2 formats.
There are several solutions to do this, but Miro video converter seems to the best, converting both to .mp3 and .ogg.
Download Miro from http://www.mirovideoconverter.com/
tags
<video width="320" height="240" controls>
<source src="pr6.mp4" type="video/mp4; codecs=avc1.42E01E,mp4a.40.2">
<source src="pr6.webm" type="video/webm; codecs=vp8,vorbis">
<source src="pr6.ogv" type="video/ogg; codecs=theora,vorbis">
</video>
event listeners
references
AV Codes supported by video containers
notes
- ↑ Read more on browsers' supported formats in https://developer.mozilla.org/en-US/docs/Web/HTML/Supported_media_formats
- ↑ http://diveintohtml5.info/video.html
- ↑ Note: a lossy audio and video compression codecs try to store the max amount of information in the smallest amount of space. One technique use to achieve this goal in video is the use of key frames instead of sequence of frames. In a second there only two or three key frames are used to create the illusion of movement, the remaining frames are filled with inbetweens, changes og pixel color. When a drastic change to the image occurs a key frame must be created.
- ↑ Unlike video, audio typically is in stereo, which means that it has 2 channels or streams
- ↑ All info on av codecs and containers in http://wiki.multimedia.cx/
