I then took a look at the tvheadend log, I had tuned to the first channel I saw in the EPG list which was BBC Parliament.
Apr 26 22:36:25 mcintyre tvheadend[1505]: mpegts: 10788V in 28E2 - tuning on TurboSight TBS 6982SE DVB-S/S2 #0 : DVB-S #0
Apr 26 22:36:25 mcintyre tvheadend[1505]: subscription: 0851: "HTTP" subscribing on channel "BBC Parliament", weight: 100, adapter: "TurboSight TBS 6982SE DVB-S/S2 #0 : DVB-S #0", network: "28E2", mux: "10788V", provider: "BSkyB", service: "BBC Parliament", profile="webtv-h264-aac-matroska", hostname="192.168.29.37", username="tvhadmin", client="Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/64.0.3282.119 Safari/537.36"
Apr 26 22:36:26 mcintyre tvheadend[1505]: TS: 28E2/10788V/BBC Parliament: MPEG2AUDIO @ #5101 Continuity counter error (total 1)
Apr 26 22:36:26 mcintyre tvheadend[1505]: TS: 28E2/10788V/BBC Parliament: MPEG2VIDEO @ #5100 Continuity counter error (total 1)
Apr 26 22:36:26 mcintyre tvheadend[1505]: TS: 28E2/10788V/BBC Parliament: TELETEXT @ #5103 Continuity counter error (total 1)
Apr 26 22:36:28 mcintyre tvheadend[1505]: transcode: 0001: 01:MPEG2VIDEO: ==> Using profile webtv-h264
Apr 26 22:36:28 mcintyre tvheadend[1505]: transcode: 0001: 02:MPEG2AUDIO: ==> Using profile webtv-aac
Apr 26 22:36:28 mcintyre tvheadend[1505]: transcode: 0001: 03:DVBSUB: ==> Filtered out
Apr 26 22:36:28 mcintyre tvheadend[1505]: transcode: 0001: 05:TEXTSUB: ==> Filtered out
Apr 26 22:36:31 mcintyre tvheadend[1505]: tbl-base: bat: 10788V in 28E2: invalid checksum (len 913, errors 1)
Apr 26 22:36:32 mcintyre tvheadend[1505]: libav: AVCodecContext: ac-tex damaged at 29 10
Apr 26 22:36:32 mcintyre tvheadend[1505]: libav: AVCodecContext: ac-tex damaged at 11 35
Apr 26 22:36:32 mcintyre tvheadend[1505]: libav: AVCodecContext: ac-tex damaged at 0 15
Apr 26 22:36:32 mcintyre tvheadend[1505]: libav: AVCodecContext: skipped MB in I-frame at 1 16
Apr 26 22:36:32 mcintyre tvheadend[1505]: libav: AVCodecContext: Invalid mb type in I-frame at 0 17
Apr 26 22:36:32 mcintyre tvheadend[1505]: libav: AVCodecContext: ac-tex damaged at 0 18
Apr 26 22:36:32 mcintyre tvheadend[1505]: libav: AVCodecContext: ac-tex damaged at 0 19
Apr 26 22:36:32 mcintyre tvheadend[1505]: libav: AVCodecContext: Invalid mb type in I-frame at 1 20
Apr 26 22:36:32 mcintyre tvheadend[1505]: libav: AVCodecContext: ac-tex damaged at 0 21
Apr 26 22:36:32 mcintyre tvheadend[1505]: libav: AVCodecContext: skipped MB in I-frame at 1 22
Apr 26 22:36:32 mcintyre tvheadend[1505]: libav: AVCodecContext: ac-tex damaged at 0 23
Apr 26 22:36:32 mcintyre tvheadend[1505]: libav: AVCodecContext: ac-tex damaged at 0 24
Apr 26 22:36:32 mcintyre tvheadend[1505]: libav: AVCodecContext: ac-tex damaged at 0 25
Apr 26 22:36:32 mcintyre tvheadend[1505]: libav: AVCodecContext: ac-tex damaged at 0 26
Apr 26 22:36:32 mcintyre tvheadend[1505]: libav: AVCodecContext: ac-tex damaged at 0 27
Apr 26 22:36:32 mcintyre tvheadend[1505]: libav: AVCodecContext: ac-tex damaged at 0 28
Apr 26 22:36:32 mcintyre tvheadend[1505]: libav: AVCodecContext: ac-tex damaged at 0 29
Apr 26 22:36:32 mcintyre tvheadend[1505]: libav: AVCodecContext: Invalid mb type in I-frame at 0 30
Apr 26 22:36:32 mcintyre tvheadend[1505]: libav: AVCodecContext: ac-tex damaged at 0 31
Apr 26 22:36:32 mcintyre tvheadend[1505]: libav: AVCodecContext: ac-tex damaged at 0 32
Apr 26 22:36:32 mcintyre tvheadend[1505]: libav: AVCodecContext: ac-tex damaged at 0 33
Apr 26 22:36:32 mcintyre tvheadend[1505]: libav: AVCodecContext: ac-tex damaged at 0 34
Apr 26 22:36:32 mcintyre tvheadend[1505]: libav: AVCodecContext: ac-tex damaged at 1 35
Apr 26 22:36:32 mcintyre tvheadend[1505]: libav: AVCodecContext: Warning MVs not available
Apr 26 22:36:32 mcintyre tvheadend[1505]: libav: AVCodecContext: concealing 1170 DC, 1170 AC, 1170 MV errors in I frame
Apr 26 22:36:32 mcintyre tvheadend[1505]: libav: AVCodecContext: using SAR=64/45
Apr 26 22:36:32 mcintyre tvheadend[1505]: libav: AVCodecContext: using cpu capabilities: MMX2 SSE2Fast SSSE3 Cache64 SlowShuffle
Apr 26 22:36:32 mcintyre tvheadend[1505]: libav: AVCodecContext: profile High, level 2.1
Apr 26 22:36:33 mcintyre tvheadend[1505]: libav: AVCodecContext: 00 motion_type at 23 25
Apr 26 22:36:33 mcintyre tvheadend[1505]: libav: AVCodecContext: 00 motion_type at 16 17
Apr 26 22:36:33 mcintyre tvheadend[1505]: libav: AVCodecContext: 00 motion_type at 18 18
Apr 26 22:36:33 mcintyre tvheadend[1505]: libav: AVCodecContext: 00 motion_type at 11 19
Apr 26 22:36:33 mcintyre tvheadend[1505]: libav: AVCodecContext: 00 motion_type at 1 20
Apr 26 22:36:33 mcintyre tvheadend[1505]: libav: AVCodecContext: ac-tex damaged at 13 21
Apr 26 22:36:33 mcintyre tvheadend[1505]: libav: AVCodecContext: 00 motion_type at 16 22
Apr 26 22:36:33 mcintyre tvheadend[1505]: libav: AVCodecContext: 00 motion_type at 7 23
Apr 26 22:36:33 mcintyre tvheadend[1505]: libav: AVCodecContext: 00 motion_type at 8 24
Apr 26 22:36:33 mcintyre tvheadend[1505]: libav: AVCodecContext: 00 motion_type at 24 26
Apr 26 22:36:33 mcintyre tvheadend[1505]: libav: AVCodecContext: invalid cbp -1 at 0 29
Apr 26 22:36:33 mcintyre tvheadend[1505]: libav: AVCodecContext: 00 motion_type at 12 30
Apr 26 22:36:33 mcintyre tvheadend[1505]: libav: AVCodecContext: Warning MVs not available
Apr 26 22:36:33 mcintyre tvheadend[1505]: libav: AVCodecContext: concealing 561 DC, 561 AC, 561 MV errors in B frame
Apr 26 22:36:34 mcintyre tvheadend[1505]: libav: AVCodecContext: ac-tex damaged at 14 9
Apr 26 22:36:34 mcintyre tvheadend[1505]: libav: AVCodecContext: 00 motion_type at 31 20
the log is pretty full with repeating lines after that and others like this:
Apr 26 22:36:35 mcintyre tvheadend[1505]: libav: AVCodecContext: Warning MVs not available
Apr 26 22:36:35 mcintyre tvheadend[1505]: libav: AVCodecContext: concealing 585 DC, 585 AC, 585 MV errors in B frame
Apr 26 22:36:36 mcintyre tvheadend[1505]: TS: 28E2/10788V/BBC Parliament: MPEG2VIDEO @ #5100 Continuity counter error (total 46)
Apr 26 22:36:36 mcintyre tvheadend[1505]: TS: 28E2/10788V/BBC Parliament: MPEG2AUDIO @ #5101 Continuity counter error (total 51)
Apr 26 22:36:36 mcintyre tvheadend[1505]: TS: 28E2/10788V/BBC Parliament: TELETEXT @ #5103 Continuity counter error (total 50)
Apr 26 22:36:36 mcintyre tvheadend[1505]: libav: AVCodecContext: Invalid mb type in P-frame at 19 11
Apr 26 22:36:36 mcintyre tvheadend[1505]: libav: AVCodecContext: Warning MVs not available
Apr 26 22:36:36 mcintyre tvheadend[1505]: libav: AVCodecContext: concealing 1080 DC, 1080 AC, 1080 MV errors in P frame
Apr 26 22:36:36 mcintyre tvheadend[1505]: libav: AVCodecContext: mb incr damaged
Apr 26 22:36:36 mcintyre tvheadend[1505]: libav: AVCodecContext: mb incr damaged
Apr 26 22:36:36 mcintyre tvheadend[1505]: libav: AVCodecContext: Invalid mb type in P-frame at 20 27
Apr 26 22:36:36 mcintyre tvheadend[1505]: libav: AVCodecContext: 00 motion_type at 0 29
Apr 26 22:36:36 mcintyre tvheadend[1505]: libav: AVCodecContext: slice mismatch