Web DVD subtitle default

Question

Does anyone know of a way to set the subtitle language from javascript with a web DVD exported from Encore? I have managed to sort of hack around it by creating duplicates of the title display items and appending their id with the language code (like id='1es'), but it would be a heck of a lot nicer to be able to do a direct call from javascript instead. However, I can't seem to find any documentation on the flashvars that can be passed in to the player.

Answer 1

No javascript. I used the fact that if there is only one subtitle in a DisplayItem, the player automatically plays it. In the interest of helping out anyone else who might run into this situation, here is a brief description of the changes made to make it work.
My project has been translated into 14 languages. Each language has its own translated copy of the menus. The desired language is selected from the first play (title) menu.
Here is a snippet of one of the copies of the Main menu:
   <DisplayItem id='14' name='MainMenu (vietnamese)' type='menu'>
    <Media type='video' startTime='0' src='Sources/_PGC_CApgc_1.f4v' loops='infinite' looppoint='0' duration='29.629'/>
    <ButtonList button='Sources/_PGC_CApgc_1.f4v' default='1' down='Sources/_PGC_CApgc Ba_1.png' over='Sources/_PGC_CApgc Bs_1.png'>
        <Button index='1' name='Play'>
            <Bounds top='200' left='116' width='57' height='30'/>
            <Action type='DisplayItem' target='1vi' mediaIndex='1'/>
        </Button>
        <Button index='2' name='Giá»›i thiệu'>
            <Bounds top='240' left='129' width='100' height='22'/>
            <Action type='DisplayItem' target='1vi' mediaIndex='1'/>
        </Button>
        <Button index='3' name='Xin chà o'>
            <Bounds top='263' left='128' width='89' height='18'/>
            <Action type='DisplayItem' target='1vi' mediaIndex='2'/>
        </Button>
Notice that the target for the <Button><Action> is 1vi, where Encore named it 1.
Now, a bit of the DisplayItem that the above menu points to:
       <DisplayItem id='1vi' name='ee_disc1' type='title'>
        <Timeline name='ee_disc1' subtitleTrackCount='14'>
            <Subtitle name='Subtitle 13:' language='Vietnamese' src='Sources/ee_disc1_subtitle_13.xml'/>
        </Timeline>
<!-- Chapter 1 -->
        <Media src='Sources/_PGC_Bpgc_entryPoint_Bbp_1.f4v' name='Chapter 1' xmpFile='Sources/_PGC_Bpgc_entryPoint_Bbp_1.xml' type='video' startTime='0' duration='111.544'/>
<!-- Hello -->
        <Media src='Sources/_PGC_Bpgc_entryPoint_IAbp_1.f4v' name='Hello' xmpFile='Sources/_PGC_Bpgc_entryPoint_IAbp_1.xml' type='video' startTime='0' duration='137.137'/>
This is a copy of the <DisplayItem id='1'...> that Encore created, which originally had all 14 subtitles referenced in it (that I can't seem to select via javascript). By making a copy of it for each language, appending the language code to the id to give it a unique name, and removing all but one subtitle reference (the one for the viewer's chosen language), I can choose the appropriate copy from a particular translated menu. Since there is only one subtitle reference in the DisplayItem, the player automatically plays it. Voila! I have subtitles chosen from my menus instead of requiring the user to go to the player's subtitle menu to choose.
All of that is really easy to do, but has a couple of drawbacks.
1) My project is fairly large, so it was a bit of a pain to make the hacks
2) This technique kills the full subtitle listing in the swf's subtitle menu. The only choice a viewer has is to choose subtitles on/off. That isn't really too bad in this case, though. I can imagine cases where I would definitely like to be able to leave all language options open while choosing one of them via javascript, though.
So, hopefully that helps someone else who might have faced a similar problem.