Can't change fontColor for STL file

[Antoine]

Hello,

I am trying to change the color of the caption text for STL subtitle file but I can't.

Here is my use case:

1. I read a SRT file s, _ := astisub.OpenFile(input)
2. I add the GSI to my subtitle (s.Metadata) object :

s.Metadata = &astisub.Metadata{
		Title:    fileNameWithoutExtTrimSuffix(input),
		Comments: comments,

		STLDisplayStandardCode:      "1",
		STLCharacterCodeTableNumber:    12336,
		STLCodePageNumber:           3683891,
		Framerate:                   25,
		Language:                    "french",
		STLCountryOfOrigin:          "FRA",

		STLCreationDate: &currentTime,
		STLRevisionDate: &currentTime,
		STLMaximumNumberOfDisplayableCharactersInAnyTextRow: astikit.IntPtr(40),
		STLMaximumNumberOfDisplayableRows:                   astikit.IntPtr(7),
		STLPublisher:                                        "",
		STLSubtitleListReferenceCode:                        "",
		STLOriginalEpisodeTitle:                             "",
		STLTimecodeStartOfProgramme:                         tcp.PresentationTime()
}

3. I add the TTI metadata to my subtitle object :

for idx, item := range s.Items {
		styleJustification := styles.Styles[idx].Justification
		styleVerticalPosition := styles.Styles[idx].VerticalPosition
		styleColor := styles.Styles[idx].Color

		c, _ := ParseHexColor(styleColor)

		justification := convertJustification(styleJustification)

		position := astisub.STLPosition{
			MaxRows:          7,
			Rows:             7,
			VerticalPosition: styleVerticalPosition,
		}

		color := astisub.Color{Red: c.Red, Green: c.Green, Blue: c.Blue}

		attr := astisub.StyleAttributes{
			STLJustification: &justification,
			STLPosition:      &position,

			TeletextColor: &color,
			TTMLColor:     astikit.StrPtr(color.TTMLString()),
		}

		item.InlineStyle = &attr

	}

4. Finally I create the STL subtitle file with s.Write(output)

My problem: All of the GSI and TTI metadatas works fine EXCEPT for the text color which is not in my final STL file. However I did change the TeletextColor and TTMLColor.

Can you help me to make the text color work for STL file ?

[Quentin Renard]

You can't update text color in STL files with this library.

In your astisub.StyleAttributes struct, using attributes that are not prefixed with STL doesn't have any impact in the process.

I guess the only way to color text in STL files would be to indicate color in teletext encoding, but that library doesn't handle it.

[Antoine]

Ok, thank you for your answer !