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pbs / pycaption

Python module to read/write popular video caption formats
Apache License 2.0
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No support for negative % values on TTML/DFXP? #300

Open rlaphoenix opened 1 year ago

rlaphoenix commented 1 year ago 
pycaption.exceptions.CaptionReadSyntaxError: CaptionReadSyntaxError(Invalid size: -2%. Please make sure the provided value is a number followed by one of the supported units: px, em, %, c, pt.)

Is the value of -2% really invalid/against spec? There are some services that avidly use it often.

<?xml version="1.0" encoding="utf-8"?>
<tt xmlns="http://www.w3.org/ns/ttml"
    xmlns:ttm="http://www.w3.org/ns/ttml#metadata"
    xmlns:ttp="http://www.w3.org/ns/ttml#parameter"
    xmlns:tts="http://www.w3.org/ns/ttml#styling" xmlns:ebuttm="urn:ebu:metadata"
    xmlns:ebutts="urn:ebu:style" xml:lang="" xml:space="default"
    ttp:cellResolution="50 30"
    ttp:timeBase="media">
    <head>
        <metadata>
            <ttm:title></ttm:title>
            <ttm:desc></ttm:desc>
            <ttm:copyright></ttm:copyright>
        </metadata>
        <styling>
            <style xml:id="BlackOnBlack"
                tts:backgroundColor="#00000080" tts:color="#00000080" />
            <style
                xml:id="BlackOnBlue" tts:backgroundColor="#0000ffff" tts:color="#00000080"
            />
            <style xml:id="BlackOnCyan" tts:backgroundColor="#00ffffff"
                tts:color="#00000080" />
            <style xml:id="BlackOnGreen"
                tts:backgroundColor="#00ff00ff" tts:color="#00000080" />
            <style
                xml:id="BlackOnMagenta" tts:backgroundColor="#ff00ffff" tts:color="#00000080"
            />
            <style xml:id="BlackOnRed" tts:backgroundColor="#ff0000ff"
                tts:color="#00000080" />
            <style xml:id="BlackOnWhite"
                tts:backgroundColor="#ffffffff" tts:color="#00000080" />
            <style
                xml:id="BlackOnYellow" tts:backgroundColor="#ffff00ff" tts:color="#00000080"
            />
            <style xml:id="BlueOnBlack" tts:backgroundColor="#00000080"
                tts:color="#0000ffff" />
            <style xml:id="BlueOnBlue"
                tts:backgroundColor="#0000ffff" tts:color="#0000ffff" />
            <style
                xml:id="BlueOnCyan" tts:backgroundColor="#00ffffff" tts:color="#0000ffff"
            />
            <style xml:id="BlueOnGreen" tts:backgroundColor="#00ff00ff"
                tts:color="#0000ffff" />
            <style xml:id="BlueOnMagenta"
                tts:backgroundColor="#ff00ffff" tts:color="#0000ffff" />
            <style
                xml:id="BlueOnRed" tts:backgroundColor="#ff0000ff" tts:color="#0000ffff"
            />
            <style xml:id="BlueOnWhite" tts:backgroundColor="#ffffffff"
                tts:color="#0000ffff" />
            <style xml:id="BlueOnYellow"
                tts:backgroundColor="#ffff00ff" tts:color="#0000ffff" />
            <style
                xml:id="CyanOnBlack" tts:backgroundColor="#00000080" tts:color="#00ffffff"
            />
            <style xml:id="CyanOnBlue" tts:backgroundColor="#0000ffff"
                tts:color="#00ffffff" />
            <style xml:id="CyanOnCyan"
                tts:backgroundColor="#00ffffff" tts:color="#00ffffff" />
            <style
                xml:id="CyanOnGreen" tts:backgroundColor="#00ff00ff" tts:color="#00ffffff"
            />
            <style xml:id="CyanOnMagenta" tts:backgroundColor="#ff00ffff"
                tts:color="#00ffffff" />
            <style xml:id="CyanOnRed"
                tts:backgroundColor="#ff0000ff" tts:color="#00ffffff" />
            <style
                xml:id="CyanOnWhite" tts:backgroundColor="#ffffffff" tts:color="#00ffffff"
            />
            <style xml:id="CyanOnYellow" tts:backgroundColor="#ffff00ff"
                tts:color="#00ffffff" />
            <style xml:id="GreenOnBlack"
                tts:backgroundColor="#00000080" tts:color="#00ff00ff" />
            <style
                xml:id="GreenOnBlue" tts:backgroundColor="#0000ffff" tts:color="#00ff00ff"
            />
            <style xml:id="GreenOnCyan" tts:backgroundColor="#00ffffff"
                tts:color="#00ff00ff" />
            <style xml:id="GreenOnGreen"
                tts:backgroundColor="#00ff00ff" tts:color="#00ff00ff" />
            <style
                xml:id="GreenOnMagenta" tts:backgroundColor="#ff00ffff" tts:color="#00ff00ff"
            />
            <style xml:id="GreenOnRed" tts:backgroundColor="#ff0000ff"
                tts:color="#00ff00ff" />
            <style xml:id="GreenOnWhite"
                tts:backgroundColor="#ffffffff" tts:color="#00ff00ff" />
            <style
                xml:id="GreenOnYellow" tts:backgroundColor="#ffff00ff" tts:color="#00ff00ff"
            />
            <style xml:id="MagentaOnBlack" tts:backgroundColor="#00000080"
                tts:color="#ff00ffff" />
            <style xml:id="MagentaOnBlue"
                tts:backgroundColor="#0000ffff" tts:color="#ff00ffff" />
            <style
                xml:id="MagentaOnCyan" tts:backgroundColor="#00ffffff" tts:color="#ff00ffff"
            />
            <style xml:id="MagentaOnGreen" tts:backgroundColor="#00ff00ff"
                tts:color="#ff00ffff" />
            <style xml:id="MagentaOnMagenta"
                tts:backgroundColor="#ff00ffff" tts:color="#ff00ffff" />
            <style
                xml:id="MagentaOnRed" tts:backgroundColor="#ff0000ff" tts:color="#ff00ffff"
            />
            <style xml:id="MagentaOnWhite" tts:backgroundColor="#ffffffff"
                tts:color="#ff00ffff" />
            <style xml:id="MagentaOnYellow"
                tts:backgroundColor="#ffff00ff" tts:color="#ff00ffff" />
            <style
                xml:id="RedOnBlack" tts:backgroundColor="#00000080" tts:color="#ff0000ff"
            />
            <style xml:id="RedOnBlue" tts:backgroundColor="#0000ffff"
                tts:color="#ff0000ff" />
            <style xml:id="RedOnCyan"
                tts:backgroundColor="#00ffffff" tts:color="#ff0000ff" />
            <style
                xml:id="RedOnGreen" tts:backgroundColor="#00ff00ff" tts:color="#ff0000ff"
            />
            <style xml:id="RedOnMagenta" tts:backgroundColor="#ff00ffff"
                tts:color="#ff0000ff" />
            <style xml:id="RedOnRed" tts:backgroundColor="#ff0000ff"
                tts:color="#ff0000ff" />
            <style xml:id="RedOnWhite"
                tts:backgroundColor="#ffffffff" tts:color="#ff0000ff" />
            <style
                xml:id="RedOnYellow" tts:backgroundColor="#ffff00ff" tts:color="#ff0000ff"
            />
            <style xml:id="WhiteOnBlack" tts:backgroundColor="#00000080"
                tts:color="#ffffffff" />
            <style xml:id="WhiteOnBlue"
                tts:backgroundColor="#0000ffff" tts:color="#ffffffff" />
            <style
                xml:id="WhiteOnCyan" tts:backgroundColor="#00ffffff" tts:color="#ffffffff"
            />
            <style xml:id="WhiteOnGreen" tts:backgroundColor="#00ff00ff"
                tts:color="#ffffffff" />
            <style xml:id="WhiteOnMagenta"
                tts:backgroundColor="#ff00ffff" tts:color="#ffffffff" />
            <style
                xml:id="WhiteOnRed" tts:backgroundColor="#ff0000ff" tts:color="#ffffffff"
            />
            <style xml:id="WhiteOnWhite" tts:backgroundColor="#ffffffff"
                tts:color="#ffffffff" />
            <style xml:id="WhiteOnYellow"
                tts:backgroundColor="#ffff00ff" tts:color="#ffffffff" />
            <style
                xml:id="YellowOnBlack" tts:backgroundColor="#00000080" tts:color="#ffff00ff"
            />
            <style xml:id="YellowOnBlue" tts:backgroundColor="#0000ffff"
                tts:color="#ffff00ff" />
            <style xml:id="YellowOnCyan"
                tts:backgroundColor="#00ffffff" tts:color="#ffff00ff" />
            <style
                xml:id="YellowOnGreen" tts:backgroundColor="#00ff00ff" tts:color="#ffff00ff"
            />
            <style xml:id="YellowOnMagenta" tts:backgroundColor="#ff00ffff"
                tts:color="#ffff00ff" />
            <style xml:id="YellowOnRed"
                tts:backgroundColor="#ff0000ff" tts:color="#ffff00ff" />
            <style
                xml:id="YellowOnWhite" tts:backgroundColor="#ffffffff" tts:color="#ffff00ff"
            />
            <style xml:id="YellowOnYellow" tts:backgroundColor="#ffff00ff"
                tts:color="#ffff00ff" />
            <style xml:id="defaultStyle"
                tts:backgroundColor="#00000000" tts:color="#ffffffff"
                tts:fontFamily="monospaceSansSerif" tts:fontSize="130%" tts:fontStyle="normal"
                tts:fontWeight="normal" tts:lineHeight="150%" tts:opacity="0"
                tts:textAlign="center" tts:textDecoration="none" />
            <style xml:id="doubleHeight"
                tts:fontSize="115%" />
            <style xml:id="textAlignCenter" tts:textAlign="center"
            />
            <style xml:id="textAlignLeft" tts:textAlign="start" />
            <style
                xml:id="textAlignRight" tts:textAlign="end" />
        </styling>
        <layout>
            <region
                xml:id="bottomAligned" tts:displayAlign="after" tts:extent="80% 80%"
                tts:origin="10% 10%" tts:padding="-2%" tts:writingMode="lrtb"
            />
        </layout>
    </head>
    <body>
        <div style="defaultStyle" xml:id="SGN0">
            <p
                begin="00:00:00.000" end="00:00:00.320" region="bottomAligned"
                style="textAlignLeft" xml:id="sub0">
                <span style="WhiteOnBlack 
doubleHeight">story: redacted</span>
                <br />
                <span style="WhiteOnBlack 
doubleHeight">Title: redacted</span>
                <br />
                <span style="WhiteOnBlack 
doubleHeight">config:2</span>
                <br />
                <span style="WhiteOnBlack doubleHeight">ep:
                    1</span>
                <br />
                <span style="WhiteOnBlack 
doubleHeight">air:</span>
            </p>
        </div>
    </body>
</tt>
ianShifrin commented 1 year ago

Hi, I believe negative margins are allowed per the spec, but believe negative padding is not.

Here is a link to a mention from the working group, https://lists.w3.org/Archives/Public/public-tt/2013May/0097.html

Thanks