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I've recently begun recording the OTA signals I'm picking up, specificaly, NBC 48 (11-1) in Pittsburgh from the Oakland area. I'm using a Radio Shack 15-1868 Antenna and a MIT MyHD MDP-120 pc dtv recorder.


Even though I recieve every channel at 80% or better signal strength, I notice lots of AC3 errors when I demux the transport stream using virtualdubmod (version 1.5.4.1). Using BeSplit to try to re-sync the AC3 stream so i can compress it into mp3, I receive the following information in the logfile. This example is from an NBC recording tonight (1/19/04):


BeSplit v0.82 by DSPguru.

--------------------------

Logging start : 01/18/04 , 23:25:31.


\\BeSplit.exe -core( -logfile C:\\cut.LOG -input C:\\cut.ac3 -prefix C:\\cutFIX -type ac3 -a -fix )


[00:00:00:000] +------- BeSplit -----

[00:00:00:000] | Input : C:\\cut.ac3

[00:00:00:000] | Output Prefix : C:\\cutFIX

[00:00:00:000] +---------------------

[00:01:36:576] Stream error : Sync found after 1341 bytes

[00:01:36:928] Stream error : Sync found after 1167 bytes

[00:03:46:528] Stream error : Sync found after 1346 bytes

[00:04:46:208] Stream error : Sync found after 1342 bytes

[00:04:46:560] Stream error : Sync found after 1345 bytes

[00:05:22:624] Stream error : Sync found after 1286 bytes

[00:05:23:008] Stream error : Sync found after 1345 bytes

[00:07:03:584] Stream error : Sync found after 1344 bytes

[00:07:03:936] Stream error : Sync found after 1350 bytes

[00:11:15:520] Stream error : Sync found after 1343 bytes

[00:11:15:872] Stream error : Sync found after 1343 bytes

[00:11:16:992] Stream error : Sync found after 1347 bytes

[00:11:17:312] Stream error : Sync found after 2794 bytes

[00:11:36:384] Stream error : Sync found after 1163 bytes

[00:11:36:736] Stream error : Sync found after 1345 bytes

[00:11:46:400] Stream error : Sync found after 1348 bytes

[00:11:46:720] Stream error : Sync found after 1346 bytes

[00:13:34:688] Stream error : Sync found after 1343 bytes

[00:13:35:040] Stream error : Sync found after 1152 bytes

[00:13:36:640] Stream error : Sync found after 1164 bytes

[00:13:36:992] Stream error : Sync found after 1350 bytes

[00:13:46:592] Stream error : Sync found after 1347 bytes

[00:13:46:976] Stream error : Sync found after 1342 bytes

[00:14:48:544] Stream error : Sync found after 1347 bytes

[00:14:48:928] Stream error : Sync found after 1344 bytes

[00:15:08:960] Stream error : Sync found after 1348 bytes

[00:15:09:312] Stream error : Sync found after 1346 bytes

[00:17:04:416] Stream error : Sync found after 1343 bytes

[00:17:04:768] Stream error : Sync found after 1343 bytes

[00:18:20:192] Stream error : Sync found after 1348 bytes

[00:19:40:928] Stream error : Sync found after 1351 bytes

[00:19:41:280] Stream error : Sync found after 1345 bytes

[00:22:06:304] Stream error : Sync found after 1161 bytes

[00:23:13:760] Stream error : Sync found after 1346 bytes

[00:23:14:112] Stream error : Sync found after 1347 bytes

[00:25:11:712] Stream error : Sync found after 1342 bytes

[00:25:12:032] Stream error : Sync found after 2822 bytes

[00:25:27:616] Stream error : Sync found after 1164 bytes

[00:25:27:968] Stream error : Sync found after 1345 bytes

[00:25:46:560] Stream error : Sync found after 1346 bytes

[00:27:05:536] Stream error : Sync found after 1348 bytes

[00:27:05:856] Stream error : Sync found after 1342 bytes

[00:28:53:440] Stream error : Sync found after 1346 bytes

[00:28:53:792] Stream error : Sync found after 1345 bytes

[00:29:34:880] Stream error : Sync found after 2817 bytes

[00:29:35:232] Stream error : Sync found after 1346 bytes

[00:29:56:288] Stream error : Sync found after 1345 bytes

[00:31:02:528] Stream error : Sync found after 1340 bytes

[00:31:02:848] Stream error : Sync found after 1347 bytes

[00:33:43:136] Stream error : Sync found after 2694 bytes

[00:34:23:040] Stream error : Sync found after 1342 bytes

[00:34:23:392] Stream error : Sync found after 1345 bytes

[00:34:48:000] Stream error : Sync found after 1347 bytes

[00:34:48:320] Stream error : Sync found after 1348 bytes

[00:35:12:928] Stream error : Sync found after 1348 bytes

[00:35:13:280] Stream error : Sync found after 1341 bytes

[00:35:48:864] Stream error : Sync found after 1344 bytes

[00:35:49:184] Stream error : Sync found after 2630 bytes

[00:36:53:760] Stream error : Sync found after 1346 bytes

[00:36:54:112] Stream error : Sync found after 1345 bytes

[00:37:54:688] Stream error : Sync found after 2800 bytes

[00:37:55:008] Stream error : Sync found after 1163 bytes

[00:38:34:112] Stream error : Sync found after 1529 bytes

[00:38:43:424] Stream error : Sync found after 1343 bytes

[00:39:58:304] Stream error : Sync found after 1349 bytes

[00:39:58:624] Stream error : Sync found after 1344 bytes

[00:42:09:728] Stream error : Sync found after 1346 bytes

[00:42:10:080] Stream error : Sync found after 1343 bytes

[00:43:22:816] Stream error : Sync found after 2816 bytes

[00:43:23:136] Stream error : Sync found after 1349 bytes

[00:43:36:352] | Writing C:\\cutFIX01.ac3

[00:43:36:352] +---------------------

[00:43:36:352] Operation Completed !

[00:00:11:000]
 

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What are you trying to do? Just extract the audio and convert it to MP3?


Have you tried playing the extracted AC3 audio in Windows Media Player? If it plays, then you really have no reason to run the audio through BeSplit.


If VirtualDubMod is not demuxing the audio correctly, try Tom Barry's modified version of DVD2AVI:
http://nic.dnsalias.com/DVD2AVIT3.zip
 
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