| transcode provides a filter plugin  filter_extsub.so for elementary DVD
	  subtitle rendering in connection with -x vob. Use it with 
	    
	    
	      | transcode [...] -J extsub=<options> |  
      The option string looks as follows (all options default to 0):  
       
      	 
		    s    subtitle track id (0-31)Use tcprobe -H N with N>1 to find out
		      if subtitle any packs are available in the program stream.
 
		    h    offset of subtitle with respect to bottom
		      of frame in rows.Subtitles are placed at the bottom of the
		      frame. Try this option to shift them up or down.
 
		    t    global display start time correction
		      in msec.If you feel, subtitles are displayed not timely,
		      adjust it with this option. This will affect all subtitles.
 
		    f    fast rendering, i.e., no anti-aliasing (0=off,1=on).Anti-aliasing of the font is performed by
		      default. Switch it of (1) if your font is tiny
		      and messed up by this feature.
 
		    w    render on post-processing (0=off,
		      1=on).Setting this option to 1 will render the
		      subtitle on post-processing instead of pre-processing.
		      This may improve subtitle quality but makes no
		      sense after extensive resizing of the frame.
 
		    a    graylevel value a (0-255).
		    b    graylevel value b (0-255).Make another subtitle color visible with full
		      intensity equal to 255. May lead to fatter fonts.
 
		    p    assign subtitle color p [0-3] to
		      graylevel value a.
		    q    assign subtitle color q [0-3] to graylevel value b.Shuffle the color assignment by choosing another
		      subtitle color between 0 and 3. Useful for black fonts on white background.
 
		 
		Example (1) changing color assignment:
		 
		  Example (2) adding another white color:
		      
		  this one looks not as expected without any further options.
		  
		    
	      
		  
		    shuffle the font color assignment
	      using 1:2 looks like this, but has an ugly 3D effect.
		      | -J extsub=0:0:0:0:0:0:0:1:2 |  
	        
	  
		  
		    shuffle the color assignment using 1:3 looks better,
	      but shows white shadows that make the font fatter but blurry
		      | -J extsub=0:0:0:0:0:0:0:1:3 |  
	        
	  
		  
		    shuffle the color assignment using 2:3 seems to be perfect.
	      Nice and smooth looking letters.
		      | -J extsub=0:0:0:0:0:0:0:2:3 |  
	        
	  
	      
		for comparison, we switch off anti-aliasing, see the difference?
		  | -J extsub=0:0:0:1:0:0:0:2:3 |  
	    
	     
	      
		  
	      this one looks already perfect without any options.
		  
	        
	      	      
		  
	      same as above with-out ant-aliasing.
		  
	        
	  
	      
		We make switch another color to full intensity (white) to
	  make the subtitle appear fatter, maybe too much.
		  | -J extsub=0:0:0:0:0:0:255 |  
	    
      
	  
	    The above fat one without anti-aliasing.
	      | -J extsub=0:0:0:1:0:0:255 |  
        
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