Setting backgroundColor transparent in Sideloaded Captions

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1

Hi–

I am making a private channel in which movies are captioned via a sideloaded SMPTE-TT file like this. I have found by experiments with my Roku channel that I can vary the captions’ text color by changing a parameter (tts:color=“red”, or whatever) in the two places it occurs in the file’s preamble.

I would like to make the captions’ background color transparent. I have tried adding tts:backgroundColor=“transparent” [ and also tts:backgroundColor=“off” and tts:backgroundColor=“rgba(0,0,0,0)”] in two places in the preamble. I have also tried adding these text strings as a style override to a span inside one caption line. None has worked: the captions’ background color remains black with an opacity of [it looks like maybe about] 80%.

In Roku’s Home > Settings > Captions, I have Mode = On and all other parameters set to default. If I set Background Opacity to Off, then I get what I want. My problem is that I would like to control that feature from the sideloaded captions file, if the viewer will permit.

Below I have put the preamble for the file in case it will prompt a suggestion.

Any ideas?

–Gil

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<tt xml:lang="en">
  <head>
    <styling>
      <style xml:id="basic" 
        tts:color="yellow" 
        tts:backgroundColor="transparent" 
        tts:fontFamily="Arial" 
        tts:fontSize="0.9c"
      />
    </styling>
    <layout>
        <region xml:id="centerleft" 
          tts:textAlign="left" 
          tts:displayAlign="after" 
          tts:origin="50%" 
          tts:padding="0 0 1c 0"
        />
    </layout>
  </head>
  <body>
    <div>
      <p style="basic" 
        begin="00:00:00.00" 
        end="00:00:00.50"
      >
        I Know What I Saw
      </p>

[...snip...(about 5000 lines)...]

      <p style="basic" 
        begin="01:31:53.72" 
        end="02:33:12.32"
      >
      </p>
    </div>
  </body>
</tt>
2

My apology for breaking the link to the full text of my sideloaded SMPTE-TT file after posting the question. If you tried to look at it and got a 404, my apology. It’s fixed now.

–Gil