[mythtv-users] Why does channel 4 transmit a silent audio track as
well as the normal audio?
ripnetuk at gmail.com
Tue Aug 30 21:24:44 UTC 2005
Im grabbing DVB-T transport streams using recent myth cvs. I am then
encoding them with mencoder to xvid.
All channels work perfectly (that ive tried) except UK Channel 4. This
seems to be broadcast with 4 streams within the TS as follows:
File c4.nuv is an MPEG-2 Transport Stream
Found PID 0x0000, Program Association Table Stream
Found PID 0x0010, Other Stream
Found PID 0x0232, stream id 0xC0 = MPEG Audio Stream 0
Found PID 0x0230, stream id 0xEA = Video Stream 10
Found PID 0x0231, stream id 0xC0 = MPEG Audio Stream 0
Found PID 0x0233, stream id 0xBD = Private Stream 1
MPEG Transport Packets = 1624357
PID 0x0000, Program Association Table packets = 811, total bytes = 149224
PID 0x0010, Other packets = 811, total bytes = 149224
PID 0x0230, Video stream 10 packets = 1466255, total bytes = 269454132
PID 0x0231, MPEG Audio stream 0 packets = 112473, total bytes = 20638808
PID 0x0232, MPEG Audio stream 0 packets = 38228, total bytes = 6880992
PID 0x0233, Private Stream 1 packets = 5779, total bytes = 1001675
The PID 231 contains the actual audio for the show, but the PID 232
seems to contain only silence. Anyone know why C4 broadcast silence?
is it a different codec? ac3 perhaps?
Anyway, as sods law would have it, mencoder encodes the second, broken
audio track, and I end up with a silent movie :(
Anyone know how to remove a pid from a ts? or maybe just re-label it
as non-audio so mencoder doesnt pick it up?
Should the program association table stream tell mencoder which one to
use? is mencoder broken in that respect?
what do others use to convert TS's to xvid? i may try ffmpeg, as that
seems to pick the correct audio stream...
any clues from the DVB expects?
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