Re: [Laszlo-dev] getting at the moveClip of a view; streaming flv files

Wed, 01 Mar 2006 04:01:33 -0800

I googled around for the error message, and found that “1 >= 0” means that the lzx compiler expects Flash version 5, but that version does not support the video objects. Rats.

 

http://www.laszlosystems.com/developers/community/forums/showthread.php?threadid=2157

 

Here’s some interesting stuff about using swfmill to make a video object:

 

http://lists.motion-twin.com/pipermail/mtasc/2005-May/014573.html

 

Here is the documentation for the instruction we need:

 

http://sswf.sourceforge.net/SWFalexref.html#tag_definevideostream

 

This tag defines a video stream. To playback the video stream, one needs to add a list of VideoFrame tags. 

  struct swf_definevideostream {
         swf_tag                f_tag;         /* 60 */
         unsigned short         f_id;
         unsigned short         f_frame_count;
         unsigned short         f_width;       /* WARNING: this is in pixels */
         unsigned short         f_height;
         unsigned char          f_reserved : 5;
         unsigned char          f_deblocking : 2;
         unsigned char          f_smoothing : 1;
         unsigned char          f_codec;
  };


The f_width
and f_height are defined in pixels.
This is rather uncommon in SWF so it is to be noted multiple times. 



The f_deblocking
parameter can be set to 0 (use the video packet information); 1 (always off) or
2 (always on). All videos are saved in small blocks of about 32x32 pixels
(there are different sizes.) Turning this feature on lets the player mix colors
between blocks for better output quality. 



The f_smoothing
flag can be set to 1 to have the player smooth the video before to render it on
the output screen. 



The f_codec
number specifies which codec was used to compress the video. At this time, the
following are defined: 




 

  
  
Number

  		
  
  
Name

  		
  
  
Comments

  		
  
  
SWF Version

  		
 

 

  
  
2

  		
  
  
Sorenson H.263

  		
  
  
 

  		
  
  
6

  		
 

 

  
  
3

  		
  
  
Screen Video

  		
  
  
 

  		
  
  
7

  		
 





 



 



This is what the swfmill xml file looks
like. It defines the file to be version 7, though, so this probably won’t
import directly into lzx. But maybe it can be loaded dynamically. 



 



<?xml version="1.0"?>



<swf version="7"
compressed="0">



  <Header framerate="12"
frames="1">



    <size>



     
<Rectangle left="0" right="3200" top="0"
bottom="2400"/>



    </size>



    <tags>



      <SetBackgroundColor>



       
<color>



         
<Color red="255" green="255" blue="255"/>



       
</color>



      </SetBackgroundColor>



      <DefineVideoStream
objectID="1" frames="0" width="160"



height="120" deblocking="0"
smoothing="0" codec="0"/>



     
<PlaceObject2 replace="0" depth="1" objectID="1"
name="videoObj">



       
<transform>



         
<Transform transX="0" transY="0"/>



       
</transform>



     
</PlaceObject2>



      <ShowFrame/>



     
<End/>



    </tags>



  </Header>



</swf>



 



Here’s some more interesting stuff
about swfmill:



 



http://iterative.org/swfmill/doc/using-swfmill.html



 



It is used with the mtasc actionscript
compiler:



 



http://www.mtasc.org/



 



The successor to mtasc is haxe, for that
that’s worth:



 



http://haxe.org/



 



It would be wicked cool to figure out a
way to use these tools to dynamically generate streaming flv movies on the
server, once we get OpenLaszlo playing them! 



 



            -Don



 



 



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