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MP3 player: Difference between revisions

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Main page ► Managing content ► Working with media ► MP3 player
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{{Working with media}}
{{Working with media}}
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The multimedia filter embeds MP3 files in a streaming player made with Flash. The big MP3 player is used when an MP3 file is added as a [[Resources|resource]]. The small player is used when an MP3 file is linked to from within a forum post or another resource or activity using the [[HTML editor]].
The multimedia filter embeds MP3 files in a streaming player made with Flash. The big MP3 player is used when an MP3 file is added as a [[Resources|resource]]. The small player is used when an MP3 file is linked to from within a forum post or another resource or activity using the [[HTML editor]].


==MP3 player rates==
==MP3 sample rates==


11.025, 22.050 and 44.100 kHz are acceptable sample rates but it is recommended to  use only 44.100 kHz (for both, music and speech recordings). The reason is that using a lower sampling rate will have very little effect on the final mp3 file size (bit rates have a bigger impact) but quality will decrease noticeably.
11.025, 22.050 and 44.100 kHz are acceptable sample rates but it is recommended to  use only 44.100 kHz (for both, music and speech recordings). The reason is that using a lower sampling rate will have very little effect on the final mp3 file size (bit rates have a bigger impact) but quality will decrease noticeably.
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==MP3 bit rates==
==MP3 bit rates==
Flash player 9 is no longer limited and can play audio files with the maximum MP3 bit rate, that is 320 kbps.
Flash player 9 is no longer limited and can play audio files with the maximum MP3 bit rate, that is 320 kbps.
However, while Flash player is not limited anymore, it is  recommend to use only one of the following:
-- 96 kbps for speech audio files (if file size is critical, 64 kbps could still be acceptable), as this will avoid having very low quality recordings.
-- 128 kbps for music (but not higher than that, as most people cannot differentiate between a 128 kbps file and a higher one).


==Flash security settings==
It is also recommended to always encode using "Joint stereo" (not "Stereo"), as this will either improve quality or reduce filesize.


Security changes in Flash player 7 may result in the MP3 player not playing MP3 files hosted on a remote server. This issue may be resolved by writing a cross-domain policy for the remote server and/or each user changing their global security settings in the Flash player settings manager.
==Flash security and Cross domain policy==


===Cross-domain policy===
Here are up to date articles on policy file changes in Flash 9 and 10 and on Cross domain policy file usage:


To create a cross-domain policy, save the code below as ''crossdomain.xml'' and place the file at the root (public_html or httpdocs) of the remote server.


<pre>
[http://www.adobe.com/devnet/flashplayer/articles/fplayer9_security.html Policy file changes in Flash Player 9 and Flash Player 10]
<?xml version="1.0" encoding="utf-8"?>
<cross-domain-policy>
<!-- Place top level domain name -->
<allow-access-from domain="www.yoursite.com" secure="false"/>
<allow-access-from domain="www.yoursite.com" to-ports="80,443"/>
<allow-http-request-headers-from domain="yoursite.com" headers="*" />
<!-- use if you need access from subdomains. testing/www/staging.domain.com -->
<allow-access-from domain="*.yoursite.com" secure="false" />
<allow-access-from domain="*.yoursite.com" to-ports="80,443" />
<allow-http-request-headers-from domain="*.yoursite.com" headers="*" />
</cross-domain-policy>
</pre>


Please refer to [http://www.macromedia.com/devnet/flash/articles/fplayer_security.html Macromedia - Developer Center: Security Changes in Macromedia Flash Player 7] for further details.
[http://www.adobe.com/devnet/flashplayer/articles/cross_domain_policy.html Cross-domain policy file usage recommendations for Flash Player]


===Global security settings===
[http://www.adobe.com/devnet/articles/crossdomain_policy_file_spec.html Cross-domain policy file specification]


Please refer to [http://www.macromedia.com/support/documentation/en/flashplayer/help/settings_manager02.html Macromedia - Flash Player Help: Global Privacy Settings Panel].
[http://www.adobe.com/devnet/flashplayer/articles/flash_player10_security_wp.html White paper: Adobe Flash Player 10 security]
 
===MP3 Encoder===
 
[http://lame.sourceforge.net/ LAME]s a high quality MPEG Audio Layer III (MP3) encoder licensed under the LGPL.


==MP3 player customisation==
==MP3 player customisation==
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==See also==
==See also==
* [[Audio in Moodle]] for  links to audio MP3 encoders, audio programs, modules and plugins for Moodle
* [[Audio in Moodle]] for  links to audio MP3 encoders, audio programs, modules and plugins for Moodle
* Using Moodle [http://moodle.org/mod/forum/discuss.php?d=43297 Multimedia resource filtering on the course page] forum discussion
*[http://moodle.org/mod/forum/discuss.php?d=199218#p869558  Useful forum post regarding mp3s] (with thanks to Guillermo Madero S
* Using Moodle [http://moodle.org/mod/forum/discuss.php?d=14663 mp3 player rates] forum discussion
 
 


* [[Podcasting]]


[[Category:Administrator]]
[[Category:Administrator]]

Latest revision as of 20:35, 28 March 2012


The multimedia filter embeds MP3 files in a streaming player made with Flash. The big MP3 player is used when an MP3 file is added as a resource. The small player is used when an MP3 file is linked to from within a forum post or another resource or activity using the HTML editor.

MP3 sample rates

11.025, 22.050 and 44.100 kHz are acceptable sample rates but it is recommended to use only 44.100 kHz (for both, music and speech recordings). The reason is that using a lower sampling rate will have very little effect on the final mp3 file size (bit rates have a bigger impact) but quality will decrease noticeably.

MP3 bit rates

Flash player 9 is no longer limited and can play audio files with the maximum MP3 bit rate, that is 320 kbps. However, while Flash player is not limited anymore, it is recommend to use only one of the following:

-- 96 kbps for speech audio files (if file size is critical, 64 kbps could still be acceptable), as this will avoid having very low quality recordings.

-- 128 kbps for music (but not higher than that, as most people cannot differentiate between a 128 kbps file and a higher one).

It is also recommended to always encode using "Joint stereo" (not "Stereo"), as this will either improve quality or reduce filesize.

Flash security and Cross domain policy

Here are up to date articles on policy file changes in Flash 9 and 10 and on Cross domain policy file usage:


Policy file changes in Flash Player 9 and Flash Player 10

Cross-domain policy file usage recommendations for Flash Player

Cross-domain policy file specification

White paper: Adobe Flash Player 10 security

MP3 Encoder

LAMEs a high quality MPEG Audio Layer III (MP3) encoder licensed under the LGPL.

MP3 player customisation

It is possible to customise the colours of the the MP3 player via CSS included in the theme. For example

.mp3flowplayer_backgroundColor {color: #000000;}

modifies the background colour, see http://flowplayer.org/documentation/skinning/controlbar.html?skin=default for more colour properties, any property that ends with '...Color' can be overridden via CSS.

For accessibility reasons it is not allowed to initiate an automatic playback.

Inserting sounds into questions

See Audio in Moodle

Method to get the Flash player only, and no link to open an external player

  1. In the question text, type "Listen to this sound xxx and say what you heard."
  2. Select xxx
  3. Click on the Insert Web Link button
  4. Give the address of your MP3 file, either a web address or an internal address of a file located in the moodledata directory of your Moodle course.
  5. Toggle HTML source and view the result, something like this: Listen to < a href="http://moodle/file.php/2/audio/trumpet.mp3" >xxx< /a > and say what you heard.
  6. Delete xxx
  7. The result will look something like (2) in screen dump below.
  8. The student can only use the Flash player.
Example of Quiz Question with Sound

Tips and tricks

Temporarily disable the MP3 player

  • You can surround your link with <nolink></nolink> tags to stop any kind of processing including the multimedia filters that create the MP3 player. This may be useful when linking to external MP3 files with characters in their name that Flash cannot understand.
TIP: Be careful with the no link tags or any user written HTML code. The HTML editor may eliminate some of your work if you use the HTML editor in the future. The HTML editor tries to tidy things up for the new user but this can frustrate an experienced user of HTML code.
NOTE: This does not work for something like the following inserted into a page resource.

<nolink><a href="http://theExampleServer.com/file.php/55/mp3_2/mt16/The_file.mp3"> The_file.mp3</a></nolink> , however you can stop the multimedia filter from showing when linking to files by adding ?forcedownload=1 to the end of the link.

See also

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