About <playlist> and Use case

As mentioned before
http://lists.w3.org/Archives/Public/public-html/2014May/0028.html

 
Since video play a more important role in web, HTML should try best to make it convenient，not only publish but also republish. Web authors need a powerful Tag to integrate abundant media resources as well as benefit other authors. And think about many people improve or fork a same video, We can easily maintain video version with little expense like Git, especially in modern network education and media wiki.
<playlist> could have many <video> <img> <map><audio><p> <track><canvas>,and <playlist> too, but have "time" attribute which indicate duration, value can be -1 meant last to end 
and  "start" attribute which indicate start time in the playlist, value can be id of others meant synchronization.
and "level" attribute which indicate which level the picture is based on background
and "top", "left" attribute to position the content in percent
and  "mixed" attribute which indicate modes to insert into video, value is “auto” as default, “on” to mix, “alt” to replace and “cut” to insert.
<playlist> uses "href" attribute to indicate the export and import video URL looking like “href=playlist1” and “href=http://www.example.org/index.html#playlist1”.

When a <playlist> embed, player should find the HTML codes in reference page. 
<a> used in <playlist> to define anchor in player’s controls.
<video>should also implement “Media Fragments URI” described at http://www.w3.org/TR/media-frags/ looking like “http://www.example.org/video.ogv#t=60,100”, but time should best in milliseconds or  decimal mode.
Player should calculate the total time and play the right pieces in sequence, and realize standard video effects.
 
<effect> is used to add standard video effects, especially transitions. 
"vid" attribute tells which pictures dose the effect apply to, value maybe like "id1:id2".
"type" attribute tells which transition effect will be used,
value maybe like "dissolve", "slide". 
"during" attribute tells duration of the effect, it doesn’t count in the total time of <playlist>.
<effect> can also utilize player’s powerful decoding ability, using attribute such as "contrast", "balance" and "color".
 
Code Example:
<playlist>
<!—place logo on top left corner ，use percent to declare size-->
<img src="images/logo.png" width="10%" height="5%" top="1%" left="5%" alt="Tip" mixed="on" time="-1" level="99"/>
<!—titles of video ->
<img src="images/title.png" width="100%" height="100%" start="0"
 time="4.00" mixed="cut"/>
<p start="0" time="4.00" level="10">
<h1>This is a representation of the playlist Tag</h1>
<p>
<video id="v1" mute="true"
src="http://www.example.org/video.ogv#t=60.00,100.50"/>
<!—replace audio of the above video-->
<audio src="bg.mp3" start="v1"/>
<!—insert another video in above video，audio and track before also accept the ruling -->
<video id="v3" src="v.ogv" mixed="cut" start="v1+10.0"/>
 
<track kind=subtitles src=brave.en.vtt label="English" 
start="v1"/>
<!—insert a playlist as a  video pice -->
<playlist id="v2" href=http://www.example.org/index.html#playlist1/>
 
<!—add a description link on progress bar -->
<a start="v2" title="play playlist at example.org"/>
<!—add a transition between v1 and v2-->
<effect vid="v1:v2" type="dissolve" during="2">
</playlist>



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