Hello,
I have a movie in.mp4 format which is playing fine, but the subtitles in .ttml format are not displayed. Is this ttml format not supported, or how can I add them to be displayed when watching the movie?
Infuse 6 - An elegant video player | Firecore at the bottom is a list of supported file types for subtitles.
Have you tried doing the add subtitles by downloading from opensubtitles in the video pull down menu?
Yes I tried, but they did not work correctly.
I have that ttml file attached, can someone convert it into a supported type?
(attachment removed by mod)
Unfortunately, .ttml subtitles are not supported at this time.
Moving this over to suggestions for now.
Do you know if there do exist converters?
You might want to try a google search for “ttml converter” that may give you a starting point to find a converter. 
Thank you, I did try that before, but it did not work, maybe because of the apostrophe in the movie / subtitle file name “E Aí… Comeu”.
I renamed everything to “E Ai… Comeu” and it is working now after I used that converter to convert to .srt / .sub: Subtitle Converter | Free tool
BTW: I thought subtitles in the subdirectory “Subs” should also be recognized? Is that not working any longer, or was this never supported?