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Friday, 7 July 2017

Lesson No. 1 Web Publishing - Inserting Sound and Video into Web page

Chapter No. 1 Web Publishing

Inserting Sound and Video into Web page
Popular Sound/Audio formats:
 .WAV - developed by Microsoft and IBM. It is the standard format for Windows.
.AIFF - (Audio Interchange File Format) developed by Apple for MAC platform
.Ra - (Real Audio Format) is lower quality audio format (smaller in size)

.MP3MP3 (MPEG-1 Audio Layer-3) is a standard technology and format for compressing a sound sequence into a very small file (about one-twelfth the size of the original file) while preserving the original level of sound quality when it is played. MP3 provides near CD quality audio.
.AU -  (Audio)  developed by Sun Microsystems for UNIX platform
.MIDI - (Musical Instrumental Digital Interface)   - format used for instrumental music,  very small in size
.RMF It is a wrapper for audio formats like .wav, .au, .aiff, .mp3 and MIDI. The purpose of the format is to encrypt the data and to store MIDI and sounds together.
Linking to audio file
We can use <a> tag to link an audio resource on your computer or web.
<a href="music/background.mp3">
Click here to play

Adding sound/audio to web pages
To add background sound to html pages <bgsound> tag is used.
It is supported by only Internet Explorer
It has no control attribute (play, stop, pause buttons)
<bgsound  src="music/background.wav" loop=2>

Src - specify the name of audio file
Loop - specifies the number of times the file must be played.
E.g.   loop="infinite"   or  loop=-1 
<embed> tag
It is used to insert audio as well as video both.
It provides console for controlling.
E.g.  <embed src="music/quit.mp3" height=100

Attributes of <embed> tag:
Src - Specifies the name of audio or video file.
Autostart - specifies whether audio should start on page load. It has two values true or false.
True value plays music when page is loaded.
False value will play music when user clicks play button.
Hidden - It is to hide the console. True value hides the console.
Volume - Sets the volume of music. Values from 1 to 100 can be set. Default is 50.
Width - specifies the width of the console.
Height - specifies the height of the console.
Controls - specifies console size Values -  console   or small consoles
Value console gives the complete console with play, stop and pause button.
Video formats
.AVI (Audio Video Interleave) - format developed by Microsoft for Windows platform.
.WMV (Windows Media video) - developed by Mircosoft
.QT (Quick Time) - format developed by Apple for MAC platform
.MPG / .MPEG  / .MP4 - formats developed  by Moving Picture experts group,  popular format on web.
.flv - developed by Adobe Flash (low quality)
Adding video to the web page
<embed> tag is used to insert video on the web page.
<embed  src="videos/sample.mp4" height=480 width=640>
Adding video using <img> tag
<img> tag along with DYNSRC attribute is used to insert video in the web page.
E.g.  <img  DYNSRC="videos/sample.mp4"   height=480     width=640>

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