Subtitle srt file colour problem

[kevin201]

Bug report

Describe the bug

Here is a clear and concise description of what the problem is:

Some RGBA font colours are not displayed correctly.
In an srt file the <font color="#00ff00ff">Text</font> should be rendered as green, but is actually black.

Expected Behavior

Here is a clear and concise description of what was expected to happen:

Should be green text.

Actual Behavior

Subtitle text appears coloured black.

Possible Fix

Alpha transparency does not appear to be understood properly?

To Reproduce

Steps to reproduce the behavior:

1. Use any srt file with RGBA colours. Some colours will not be rendered correctly and appear black.

Debuglog

The debuglog can be found here:

Screenshots

Here are some links or screenshots to help explain the problem:

Additional context or screenshots (if appropriate)

Here is some additional context or explanation that might help:

Your Environment

Used Operating system:

• Android

• iOS

• tvOS

• Linux

• OSX

• Windows

• Windows UWP

• Operating system version/name:

• Kodi version:
  Leia 18

note: Once the issue is made we require you to update it with new information or Kodi versions should that be required.
Team Kodi will consider your problem report however, we will not make any promises the problem will be solved.

[enen92]

Please share a subtitle sample

[kevin201]

4
00:00:49,640 --> 00:00:51,600
<font color="#00ff00ff">I think I've got more</font>
<font color="#00ff00ff">than enough. Thanks.</font>

[DaVukovic]

Seems your hex-code is wrong. I changed the one line to:

<font color="#00ff00">I think I've got more</font>
and it works like a charm. I removed the last ff

Check for the correct code here: https://www.color-hex.com/

[kevin201]

Seems your hex-code is wrong. I changed the one line to:

<font color="#00ff00">I think I've got more</font>
and it works like a charm. I removed the last ff

Check for the correct code here: https://www.color-hex.com/

Hi! :-)

Many thanks for the interest. The hex code (not mine, by the way) is in the form #rrggbbaa, where "aa" is the alpha, or transparency.

Hence, not actually wrong, and I do know that Kodi renders #rrggbb codes correctly, but apparently not with the alpha portion.

[DaVukovic]

Seems the alpha channel for subtitles is a feature request: https://forum.kodi.tv/showthread.php?tid=332432

So I'll close this one as it's not an issue if it's unsupported. I did a few tests and the alpha-channel-section seems not to be supported currently.

[kevin201]

Interesting, thanks.
I've just had another scout around, and the alpha format seems to be muddled between Android and W3

Android defines it as #AARRGGBB :
https://developer.android.com/guide/topics/resources/more-resources#Color

Where W3 has is as #RRGGBBAA :
https://www.w3.org/TR/css-color-4/#hex-notation

Thanks for the info anyway. At least we know that this is coming through in some .srt files now.

[enen92]

Subtitles will (fingers crossed) have a lot of improvements for v20 where the old GUI based component will hopefully be removed in favour of libass as the engine, which will.overcome a lot of style limitations we have right now.
I'll reopen this and add it as a roadmap issue. Thanks for checking it out Davu.

[enen92]

After some internal discussion we were not able to find any source that mentions that rgba colours are supported in srt subs. If you want to have a custom implementation where this is supported you can try the above patch. However, it will not make it into the source code.

[kevin201]

After some internal discussion we were not able to find any source that mentions that rgba colours are supported in srt subs. If you want to have a custom implementation where this is supported you can try the above patch. However, it will not make it into the source code.

Thanks again. Just for info this is still a current issue, as I am regularly receiving srt files with that colour format.

00:19:29,760 --> 00:19:32,960
<font color="#00ffffff">straight back to our front door.</font>
<font color="#00ffffff">To you, Mica, Pearl.</font>

319
00:19:32,960 --> 00:19:36,080
<font color="#00ffffff">And to Raymond. No-one is safe.</font>

[enen92]

Thanks for the provided examples @kevin201
I've submitted #20307 as a way to always take the first 3 bytes of the colour and assume its RGB.

[kevin201]

Many thanks.