Tvheadend

Facing a strange issue with TVH. I'm feeding the live streams into a DLNA server ( tried xupnpd and serviio ), but my DLNA client ( samsung TV 40H7000 ) is complaining about the format. I tried different scenarios, to figure out what could be the issue:
1. can play the recorded files ( mkv ) through DLNA,
2. can play the recorded files pulled through another http server as stream and fed into dlna server ( uhttpd )
3. can't play the recordings pulled through tvh as stream and fed into dlna server http://ip/dvrfile/xxx, gives unknown format.
4. can't play the live streams from tvh fed into dlna server, same errro, unknown format

I'm guessing that maybe the stream provided by tvh is somehow different from the recording, and that's why my TV refuses to play it.

Is there any difference in terms of format/container/headers between streams and recordings provided by tvh?

Any input is appreciated.

Thanks.