DVB subtitle works from normal aerial transport, but not through network.

I record TV with an external device as transport stream (=ts format) having all audio and subtitles with it. The file definitely have them all, since VLC finds them well.

But this Philips TV does not find DVB subtitle while the .ts file is streamed as DLNA content thtough network. Subtitle is even gayed out in options menu. Audio works, picture works, subtitle doesn't.

Ts stream is the same bit stream which is coming from the aerial, so I suppose this must be a software problem with the TV.