Unsupported subtitle format leads to Clapper refusing to play the video entirely because of the "missing plugin"

[nekohayo]

If you download this file, archived from YouTube using VideoDownloader:

Annotating.PDFs.Acrobat.for.Educators.webm

...and try to open it with the flatpaked (flathub) version of Clapper 0.6.0, then Clapper will completely refuse to play the file, even though subtitles are kind of optional:

Maybe it could special-case subtitle plugin types as being non-fatal if missing?

Troubleshooting information

• GLib 2.78.4
• GTK 4.12.5
• Adwaita 1.4.4
• GStreamer 1.22.8

[Rafostar]

For now, linking upstream issue if anyone wants to help fix them, so they will actually play: https://gitlab.freedesktop.org/gstreamer/gstreamer/-/issues/1100

Maybe it could special-case subtitle plugin types as being non-fatal if missing?

While we could just quietly ignore them... but then nobody would know that his/her video is missing something. So this needs to be considered here too.

[nekohayo]

Maybe the error message in non-fatal cases could be shown as GtkOverlay widget, a bit like the completed copy in-app notifications in Nautilus and Calendar?