[mythtv-users] (no subject)

[Scott]

Greets.

For one of the local OTA ATSC stations here (Raleigh / Durham NC  
area, the station is WTVD 11.1) I'm seeing audio cut in and out 100%  
of the time. If I run mythfrontend -v audio the output shows buffer  
under runs, and lots of them. But wait! This same exact stream plays  
perfectly fine with both xine and mplayer. By this I mean I can  
either run mplayer dvb:// and tune the stream directly OR I can use  
mplayer and xine to playback a stream that was recorded by MythTV.  
The playback sounds fine with mplayer and xine.

So, I'm thinking there must be something "special" about the audio  
track on this one OTA ATSC station. Using mplayer -v to view a  
previously recorded show from this station I see lots of the  
following when decoding the "broken" stream. Notice the "ERROR,  
descriptor len is too long, skipping" coming from mplayer: (But  
still, even with this, the stream sounds fine!)

COLLECT_SECTION, start: 64, size: 184, collected: 184%  3%  0.8% 0 0
SKIP: 0+1, TID: 0, TLEN: 13, COLLECTED: 184
PARSE_PAT: section_len: 13, section 0/0
PROG: 1 (1-th of 1), PMT: 48
COLLECT_SECTION, start: 64, size: 184, collected: 184
SKIP: 0+1, TID: 2, TLEN: 86, COLLECTED: 184
FILL_PMT(prog=1), PMT_len: 184, IS_START: 64, TS_PID: 48, SIZE=184, M=0,
ES_CNT=2, IDX=0, PMT_PTR=0x8805300
PROG DESCR, TAG=5, LEN=4(4)
PROG DESCR, TAG=5, LEN=4(4)
PROG DESCR, TAG=5, LEN=4(4)
PROG DESCR, TAG=5, LEN=4(4)
PROG DESCR, TAG=5, LEN=4(4)
PROG DESCR, TAG=5, LEN=4(4)
ERROR, descriptor len is too long, skipping
...descr id: 0x2, len=3
...descr id: 0x6, len=1
PARSE_PMT(1 INDEX 0), STREAM: 0, FOUND pid=0x31 (49), type=0x10000002,
ES_DESCR_LENGTH: 8, bytes left: 28
...descr id: 0x5, len=4
...descr id: 0x81, len=6
...descr id: 0xa, len=4
Language Descriptor: eng
...descr id: 0x6, len=1
PARSE_PMT(1 INDEX 1), STREAM: 1, FOUND pid=0x34 (52), type=0x2000,
ES_DESCR_LENGTH: 23, bytes left: 0

Compare this to the stream from a different OTA ATSC station that  
MythTV has no problems playing back. No obvious ERRORs here.

COLLECT_SECTION, start: 64, size: 184, collected: 184%  4%  1.0% 0 0
SKIP: 0+1, TID: 0, TLEN: 13, COLLECTED: 184
PARSE_PAT: section_len: 13, section 0/0
PROG: 1 (1-th of 1), PMT: 48
COLLECT_SECTION, start: 64, size: 184, collected: 184
SKIP: 0+1, TID: 2, TLEN: 79, COLLECTED: 184
FILL_PMT(prog=1), PMT_len: 184, IS_START: 64, TS_PID: 48, SIZE=184, M=0,
ES_CNT=3, IDX=0, PMT_PTR=0x8805300
PROG DESCR, TAG=5, LEN=4(4)
...descr id: 0x11, len=1
...descr id: 0x10, len=6
...descr id: 0x6, len=1
...descr id: 0x86, len=7
PARSE_PMT(1 INDEX 0), STREAM: 0, FOUND pid=0x31 (49), type=0x10000002,
ES_DESCR_LENGTH: 23, bytes left: 32
...descr id: 0x5, len=4
...descr id: 0x81, len=8
...descr id: 0xa, len=4
Language Descriptor: eng
PARSE_PMT(1 INDEX 1), STREAM: 1, FOUND pid=0x34 (52), type=0x2000,
ES_DESCR_LENGTH: 22, bytes left: 5
PARSE_PMT(1 INDEX 2), STREAM: 2, FOUND pid=0x3a (58), type=0xffffffff,
ES_DESCR_LENGTH: 0, bytes left: 0

My signal strength is fine on this channel and the above problem is  
present on _every_ show for this channel. Any thoughts? Is this  
simply a case of a broken audio stream that MythTV isn't handling well?

Thanks for the help!

--
Scott