Ac3 Errors when demuxing

[PALace]

Hi,
I have noticed that sometimes the ac3 audio stream which dgindex has demuxed has errors. I noticed slight sync errors and ran the ac3 stream through BeSliced which then repaired errors running through the whole file. I then demuxed the same stream using PGCDemux and ran it through BeSliced and there were no errors. Any ideas. Is this a bug?

[Guest]

Can you provide a VOB fragment that I can use to duplicate this issue? If so, please upload it to my FTP server and notify me of the filename.

[PALace]

Hi,
Thanks for your reply. I'll do a fragment tomorrow for you. Appreciate your assistance. Incidently, to further this report and perhaps make it easy for you to duplicate, the errors on ac3 streams only occur when there is a delay, ie if I've cut a vob etc. Thanks again. Hope this is helpful.

[PALace]

Hi,
Well as I've no internet connection, I don't think it's feasible to send you a sample. But I do have more information for you.
1. If the dvd is ripped using DVD Shrink, there are no problems with a DGIndex demuxed audio stream.
2. If it's ripped with DVDDecrypter, then there are only problems if there is a delay with the audio stream.
3. If that file is demuxed with PGCDemux, the ac3 stream is fine.
4. I ran a vob I'd created with DVD Decrypter (which I was hoping to upload to you) through BeSliced and got the following log.
BeSplit v0.82 by DSPguru.
--------------------------
Logging start : 01/11/06 , 23:43:25.

C:\DOCUME~1\LOCALS~1\Temp\Rar$EX24.0353\BeSplit.exe -core( -input H:\DVDVolume\VIDEO_TS\VTS_01_1.VOB -prefix H:\DVDVolume\VIDEO_TS\VTS_01_1_Fixed -fix -logfile C:\DOCUME~1\Temp\BeSliced.txt -type VOB ) -profile( BeSliced v0.2 )

[00:00:00:000] +------- BeSplit -----
[00:00:00:000] | Input : H:\DVDVolume\VIDEO_TS\VTS_01_1.VOB
[00:00:00:000] | Output Prefix : H:\DVDVolume\VIDEO_TS\VTS_01_1_Fixed
[00:00:00:000] +---------------------
[00:00:00:026] Stream error : Sync found after 11121 bytes
[00:00:00:052] Stream error : Sync found after 355 bytes
[00:00:00:176] Stream error : Sync found after 49187 bytes
[00:00:00:278] Stream error : Sync found after 43912 bytes
[00:00:00:350] Stream error : Sync found after 1002 bytes
[00:00:00:386] Stream error : Sync found after 1920 bytes
[00:00:00:470] Stream error : Sync found after 5710 bytes
[00:00:00:494] Stream error : Sync found after 1038 bytes
[00:00:00:643] Stream error : Sync found after 10673 bytes
[00:00:00:793] Stream error : Sync found after 3679 bytes
[00:00:00:817] Stream error : Sync found after 1368 bytes
[00:00:00:841] Stream error : Sync found after 156 bytes
[00:00:00:901] Stream error : Sync found after 551 bytes
[00:00:00:925] Stream error : Sync found after 220 bytes
[00:00:01:099] Stream error : Sync found after 1272 bytes
[00:00:01:125] Stream error : Sync found after 379 bytes
[00:00:01:149] Stream error : Sync found after 169 bytes
[00:00:01:200] Stream error : Sync found after 1480 bytes
[00:00:01:226] Stream error : Sync found after 106 bytes
[00:00:01:278] Stream error : Sync found after 3325 bytes
[00:00:01:314] Stream error : Sync found after 4 bytes
[00:00:01:338] Stream error : Sync found after 691 bytes
[00:00:01:364] Stream error : Sync found after 172 bytes
[00:00:01:390] Stream error : Sync found after 528 bytes
[00:00:01:462] Stream error : Sync found after 1372 bytes

etc until
[00:04:39:198] Stream error : Sync found after 695 bytes
[00:04:39:284] Stream error : Sync found after 4405 bytes
[00:04:39:308] Stream error : Sync found after 418 bytes
[00:04:39:344] Stream error : Sync found after 4 bytes
[00:04:39:370] Stream error : Sync found after 893 bytes
[00:04:39:432] Stream error : Sync found after 1034 bytes
[00:04:39:468] Stream error : Sync found after 266 bytes
[00:04:39:494] Stream error : Sync found after 1352 bytes
[00:04:39:547] Stream error : Sync found after 4419 bytes
[00:04:39:573] Stream error : Sync found after 12281 bytes
[00:04:39:597] Stream error : Sync found after 3078 bytes
[00:04:39:669] Stream error : Sync found after 933 bytes
[00:04:39:731] Stream error : Sync found after 2003 bytes
[00:04:39:757] Stream error : Sync found after 11112 bytes
[00:04:39:793] Stream error : Sync found after 31 bytes
[00:04:39:817] Stream error : Sync found after 1700 bytes
[00:04:39:843] Stream error : Sync found after 2681 bytes
[00:04:39:843] | Writing H:\DVDVolume\VIDEO_TS\VTS_01_1_Fixed01.VOB
[00:04:39:843] +---------------------
[00:04:39:843] Operation Completed !
[00:00:09:000] <-- Process Duration
Logging ends : 01/11/06 , 23:43:34.

So, if I then demux the audio from that with PGCDemux, there are no errors but if I use DGIndex, then BeSliced will correct all the erros, as listed above.

Hope this is of use to you.

[Guest]

> Hope this is of use to you.

The sample VOB will help me the most.

[PALace]

Ok, I'll do my best. Actually that's how I noticed that DVD Shrink produced no problems as I was creating a small vob for you to test with that but decided to check it first. The only way I can rip a small vob with DVD Decryptor is to author an small sample myself and then rip it with DVDD. Sorry about the delay.