If the new TV channel has a different video frame size to the old one, but the video type is the same a graph rebuild is not triggered. Some decode filters can handle this, others can't. The mod fixes this by detecting the size change and triggering a partial graph rebuild.

h4. Steps to Reproduce
Both channels need to be on the same mux/transponder, and have the same video type (MPEG2/H264) but different frame sizes e.g. SD->HD switch.

h4. Additional Information
See http://forum.team-mediaportal.com/mp-1-2-x-550/graph-re-build-tv-channel-change-98380/ , http://forum.team-mediaportal.com/mediaportal-1-2-0-alpha-536/rebuild-graph-between-hd-channels-95545/ and http://forum.team-mediaportal.com/bugreports-74/mediaportal-hangs-going-between-hd-sd-channels-100978/

Patch (for 1.2.0 Beta) attached here - http://forum.team-mediaportal.com/764396-post139.html ('TsReader_zappingRebuildMod1.patch')