"soverlay" keeps old subtitle on screen after seeking
If I transcode a video with "soverlay" enabled and I seek the video while the transcoding is happening (via web interface for example) and at the moment when I seeked the video there was subtitle being shown: that particular subtitle won't disappear after the video has seeked into the new position. The old subtitle remains in the transcoded video as long as there will be a new subtitle(s) to be shown.
This happens with MPEG-TS DVB subtitles at least (I haven't tested it with .srt/.sub subtitles).
This is quite annoying because if I seek the video to the position when the program actually starts and there aren't subtitles at all: the soverlay keeps the old and same subtitle on the screen for the rest of the video.
I think the soverlay should clear the screen from the subtitles every time when seeking is happening.
I've verified this bug in VLC 3.0.7 and 4.0-git (2019-07-18).