Distributed Multimedia Database System Phase 2

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Context And Goals

Due to the interest of G.I.S.S. users in the mediabase component version 1.0 released previously, as a real alternative to public systems like YouTube or Vimeo, improvements should be made to the actual mediabase version 1.0, to include more features like playlists, favorites, subtitles, ...

Setting up the next developments

To achieve a number of new features like playlists or annotations, we first had to modify the cortado with additional functionalities :

  • Access to the timestamp of the video played from javascript :
Cortado = document.getElementById("cortado");
timecode = Cortado.getPlayPosition(); 
  • Call to an external javascript function when the end of the video is reached :
<applet code="com.fluendo.player.Cortado.class" archive="cortado-ovt-debug-giss.jar" height="240" width="320" MAYSCRIPT>
<param name="endCallback" value="nextTrack();"> 
  • We also found that to play videos more easily, the cortado applet should be modified to play several video at the same time.

The code has been modified so that Cortado can create more than one instance.

  • Another thing missing in Cortado was the support for 16/9 format,

That was requested by some dmmdb 1.0 users, it has been implemented in dmmbd 2.0.

Warning : if you want your videos to be uploaded in 16x9 format, you have to set upload dimensions in dmmdb to a 16/9 format, like it is done in [Giss 16/9]

There the settings are ( in config.php ) :

$config['videowidth'] = "480";
$config['videoheight'] = "272";

So, if you want to upload 16/9 videos to GISS server, you have to use http://giss.tv/dmmdb16.

  • A few additional facilities have been added like a volume control and the displaying of video duration.

For using these features, you will need to download the [Giss Cortado], which is based on Cortado 0.2.2.

CVS version of cortado G.I.S.S.

The G.I.S.S. cortado can be obtained through CVS :

export CVSROOT=:pserver:anonymous@giss.tv:/home/cvs
cvs co cortado-giss

Adding of new blocks and funcionalities

  • Added a block of most viewed videos on the channel, updating the counter through ajax when a video is requested :

Image:Dmmdb-viewed.png

  • Added a voting system and a block of favorite videos :

Image:Dmmdb-favorites.png

Support for playlists

In version 2.0, each canal can administrate his own playlists containing local and remote media files, see :

Image:Dmmdb-playlist.png

Support for annotations/subtitles

This functionality can be used to import/export subtitles files in .srt format as well as a tool for on-line annotations of media.

In each channel, a choice called 'ANNOTATE MEDIA' has been added to the admin menu to be able to edit the annotations/subtitles.

This choice is in the admin menu and is reserved to the publisher of the media, the current annotations/subtitles can be downloaded from the main page and is accessible to everyone naturally.

Image:Dmmdb-subtitles.png

Release of an official Release Candidate : dmmdb 2.0 RC1

The version of dmmdb 2.0 is available here ( version 2.0 RC1 ) :

dmmdb-2.0-rc1

You can also obtain the current version of dmmdb through CVS :

export CVSROOT=:pserver:anonymous@giss.tv:/home/cvs
cvs co dmmdb

Warning : it is not fully compatible with version 1.0, so if you have a version 1.0 installed, you should upgrade the code and following the procedure below to adapt your database ( see next section ).

Migration from version 1.0

If you have installed a version 1.0, you will need to do the following to the database, not to recreate it from scratch :

Create data for the view counter :

ALTER TABLE media ADD COLUMN viewed int(10) NOT NULL DEFAULT 0;
INSERT INTO blocks VALUES (NULL,'most_viewed','video',2,8,397,100,1,<user id>,NULL);
for users you have created before

Create data for the favorites :

CREATE TABLE `favorites` (
`ID` int(4) unsigned NOT NULL auto_increment,
`channel` varchar(256) collate utf8_bin NOT NULL,
`base_url` varchar(256) collate utf8_bin NOT NULL,
`media_id` int(4) NOT NULL,
`votes` int(4) NOT NULL DEFAULT 0,
UNIQUE KEY `ID` (`ID`)
) ENGINE=MyISAM AUTO_INCREMENT=0 DEFAULT CHARSET=utf8 COLLATE=utf8_bin;
INSERT INTO blocks VALUES (NULL,'favorites','video',2,9,397,100,1,<user id>,NULL);
for users you have created before

Create data for the playlists :

CREATE TABLE `playlist` (
`ID` int(4) unsigned NOT NULL auto_increment,
`channel` varchar(256) collate utf8_bin NOT NULL,
`name` text collate utf8_bin NOT NULL,
`base_url` varchar(256) collate utf8_bin NOT NULL,
`media_id` int(4) NOT NULL,
UNIQUE KEY `ID` (`ID`)
) ENGINE=MyISAM AUTO_INCREMENT=0 DEFAULT CHARSET=utf8 COLLATE=utf8_bin;
INSERT INTO blocks VALUES (NULL,'playlists','video',2,10,397,100,1,<user id>,NULL);
for users you have created before

Create data for the annotations/subtitles :

CREATE TABLE `subtitles` (
`ID` int(32) unsigned NOT NULL auto_increment,
`name` text collate utf8_bin NOT NULL,
`media_id` int(32) NOT NULL default 0,
`starttime` float NOT NULL default -1.0,
`endtime` float NOT NULL default -1.0,
`text` text collate utf8_bin NOT NULL,
UNIQUE KEY `ID` (`ID`)
) ENGINE=MyISAM AUTO_INCREMENT=0 DEFAULT CHARSET=utf8 COLLATE=utf8_bin;
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