RPi4 / Libreelec nightly / seeking forward and backward doesn't work for streaming from internet

copy from here since it is related to a development build

debug log is available as kodi.log at https://paste.kodi.tv.

Thanks a lot for your deeper analysis of my problem in advance.

As an additional test, I downloaded an Arte TV mediathek movie as mp4 file.

Interestingly, the fast forward is working when playing this downloaded mp4 file from an USB stick attached to the RPi4.

However, when I try to play the same movie from the Arte Mediathek addon, fast forward is not working. Playing the movie from start to end without any interrption, however, is working.

Any idea?

Further tests revealed that the root cause is not Kodi or Libreelec, but the addon 'Arte Mediathek' V2.0.1 originated by sarbes.

I will address this issue to sarbes in the concerning forum thread.

Seeking forward or backward is working with many other Mediathek addons.