[mythtv] Mythtranscode Lossless mpeg2 and BBC dvb-t [UK]

[John]

I tried latest SVN #8307 with lossless mpeg2 transcoding on UK DVB-T. 
Only the ITV cgannels seem to work properly. I am guessing because the 
BBC channels contain "empty" audio channles that register as 0 
channlels, these are used for Audio descriptions. A typical mythbackend 
output is :

2005-12-18 17:43:01.021 Transcode Running for What Not to Wear "Mid-Life 
Crisis Men": 2.0 GB => 0 bytes (Autodetect)
2005-12-18 17:43:01.032 transcode: Transcode Running
2005-12-18 17:43:01.040 Transcode Starting for What Not to Wear 
"Mid-Life Crisis Men": 2.0 GB (Autodetect)
2005-12-18 17:43:01.057 transcode: Transcode Starting
2005-12-18 17:43:01.353 Using runtime prefix = /usr/local
2005-12-18 17:43:01.386 New DB connection, total: 1
2005-12-18 17:43:01.401 Enabled verbose msgs: important
2005-12-18 17:43:01.410 New DB connection, total: 2
2005-12-18 17:43:01.424 Transcoding from 
/myth/tv/1000_20051109200000_20051109210000.mpg to 
/myth/tv/1000_20051109200000_20051109210000.mpg.tmp
2005-12-18 17:43:01.448 Connecting to backend server: 192.168.254.4:6543 
(try 1 of 5)
2005-12-18 17:43:01.463 Using protocol version 22
2005-12-18 17:43:01.479 MainServer::HandleAnnounce Monitor
2005-12-18 17:43:01.485 adding: mythtv as a client (events: 0)
0: start_time: 1440.153 duration: 323.600
1: start_time: 1440.115 duration: 323.598
2: start_time: 1440.115 duration: 323.638
3: start_time: 1440.115 duration: 323.638
stream: start_time: 16001.277 duration: 3595.980 bitrate=4884 kb/s
2005-12-18 17:43:01.806 AFD: Opened codec 0x80d5b20, id(MPEG2VIDEO) 
type(Video)
2005-12-18 17:43:01.833 AFD: Opened codec 0x80d6040, id(MP3) type(Audio)
2005-12-18 17:43:01.837 AFD: Audio Track #1 is A/V stream #1 and has 2 
channels in the English language(6647399).
2005-12-18 17:43:01.841 AFD: Opened codec 0x80d6560, id(MP3) type(Audio)
_2005-12-18 17:43:01.845 AFD: Audio Track #2 is A/V stream #2 and has 0 
channels in the English language(6647399)._
2005-12-18 17:43:01.849 AFD: Opened codec 0x80d6a80, id(DVB_SUBTITLE) 
type(Subtitle)
2005-12-18 17:43:01.854 AFD: Trying to select audio track (w/lang)
2005-12-18 17:43:01.859 AFD: Selected track 1: English MP2 2ch (A/V 
Stream #1)
2005-12-18 17:43:01.863 AFD: Initializing audio parms from audio track #1
2005-12-18 17:43:01.868 AFD: Audio format changed
                        from id(NONE)    -1Hz -1ch   0bps    ; 
id(NONE)    -1Hz -1ch   0bps  
                        to   id( MP3) 48000Hz  2ch  16bps    ; id( MP3) 
48000Hz  2ch  16bps  
2005-12-18 17:43:01.991 New DB connection, total: 3
2005-12-18 17:43:02.024 Switching to MPEG-2 transcoder.
2005-12-18 17:43:02.043 Opening 
/myth/tv/1000_20051109200000_20051109210000.mpg
Skipping unsupported codec 3
No more queue slots!
2005-12-18 17:43:02.598 Unknown socket closing
2005-12-18 17:43:02.607 Transcode Errored for What Not to Wear "Mid-Life 
Crisis Men": 2.0 GB => 0 bytes (Autodetect)
2005-12-18 17:43:02.619 transcode: Transcode Errored

The same happens on BBC, Channel 4 and Channel 5 but appears to be ok on 
ITV channels on UK DVB-T {freeview}