MP1-4155: added possibility to seek in RTSP stream (if supported by server)
fixed splitting of H264 video
changed reporting duration
forced IPTV to work as live stream
removed disabled IPTV filter
Merge branch 'MP1-4155-FEAT-Merge_of_IPTV_filter_and_MediaPortal_Url_Source_Splitter' of https://github.com/MediaPortal/MediaPortal-1 into MP1-4155-FEAT-Merge_of_IPTV_filter_and_MediaPortal_Url_Source_Splitter