Mimicking playbin's subtitles

Application Development
1

I noticed that the way playbin handles subtitles is a lot better than using a uridecodebin + subtitleoverlay combination. What does playbin use or do under the hood to improve subtitle placement, etc? I would like to get the same results as playbin for managing subtitles.

gst-launch-1.0 subtitleoverlay name=t font-desc="Sans bold 16" ! videoconvert ! autovideosink uridecodebin3 name=d uri=file:///path/to/video-with-subtitles.mkv ! t.video_sink d.text_0 ! t.subtitle_sink
2

This is not an answer, though you could have a look to playbin sources.

3

Yeah, I’ve been looking at them for the past few days trying to wrap my head around it, but haven’t been able to determine what exactly playbin does differently.