[mythtv-users] Mythtranscode and DVB-T in the UK (Ticket #2077 etc)

John Pilkington J.Pilk at tesco.net
Mon Mar 3 10:33:41 UTC 2008


The recorded data from BBC channels in the UK often include a large 
number of transport streams.  There's an example below of terminal 
output during a mythtranscode session.  Mythtranscode drops the data 
streams and the dvbsub; it would be nice to be able to keep the 
subtitles through a 'lossless' transcode done to apply a cutlist, but it 
seems that this still isn't supported.  Maybe ProjectX?

Mythtranscode keeps both audio streams.  It seems that this quite often 
causes problems, probably because the low-rate stream isn't always there 
and/or is sometimes treated as the primary stream.  When Mythtranscode 
fails (eg with 'one buffer is full and one empty') the recording can 
often be processed by using mencoder to copy only the video and the main 
audio stream.  This makes a bit more room on DVDs, too, and may prevent 
A/V sync problems.

I don't have a script to do this in a fully reliable fashion but anyone 
who doesn't already have a personal workaround to the problem might like 
to try the attached and perhaps tweak it to make it more generally 
usable as a preprocessor.

Before entry the .mpg file must be renamed to .mpg0    The first 
argument can be obtained from konqueror by 'copy' from 'properties', and 
the second (usually) from the terminal output when run with only the 
first.  Sometimes a 1 or 0 is required instead of the hex value returned 
  by ffmpeg.

John Pilkington
----------------

09:16:48.597   Duration: 01:04:52.8, start: 37099.898989, bitrate: 6086 kb/s
2008-03-03 09:16:48.597     Stream #0.0[0x258]: Video: mpeg2video, 
yuv420p, 720x576 [PAR 64:45 DAR 16:9], 15000 kb/s, 25.00 tb(r)
2008-03-03 09:16:48.597     Stream #0.1[0x259](eng): Audio: mp2, 48000 
Hz, stereo, 256 kb/s
2008-03-03 09:16:48.597     Stream #0.2[0x25a](eng): Audio: mp2, 48000 
Hz, mono, 64 kb/s
2008-03-03 09:16:48.598     Stream #0.3[0x25b](eng): Subtitle: dvbsub
2008-03-03 09:16:48.598     Stream #0.4[0x3ed]: Data: 0x0000
2008-03-03 09:16:48.598     Stream #0.5[0x3ee]: Data: 0x0000
2008-03-03 09:16:48.598     Stream #0.6[0x3ef]: Data: 0x0000
2008-03-03 09:16:48.598     Stream #0.7[0x28a]: Data: 0x0000
2008-03-03 09:16:48.598     Stream #0.8[0x28b]: Data: 0x0000
2008-03-03 09:16:48.598     Stream #0.9[0x28c]: Data: 0x0000
2008-03-03 09:16:48.598 Skipping unsupported codec 3 on stream 3
2008-03-03 09:16:48.598 Skipping unsupported codec 2 on stream 4
2008-03-03 09:16:48.598 Skipping unsupported codec 2 on stream 5
2008-03-03 09:16:48.598 Skipping unsupported codec 2 on stream 6
2008-03-03 09:16:48.598 Skipping unsupported codec 2 on stream 7
2008-03-03 09:16:48.598 Skipping unsupported codec 2 on stream 8
2008-03-03 09:16:48.598 Skipping unsupported codec 2 on stream 9
2008-03-03 09:16:48.728 #0 PTS:10:18:20.136 Delta: 0.0ms queue: 9
2008-03-03 09:16:48.728 #1 PTS:10:18:20.114 Delta: 21.1222ms queue: 2
2008-03-03 09:16:48.728 #2 PTS:10:18:20.711 Delta: -575.689ms queue: 12
Mux rate: 15.57 Mbit/s


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