SCR Timing Errors

[Aquilonious]

I backed up Close Encounters, movie only, using DVD Shrink. Then using Shrink again, I edited the first portion of the movie out--the Columbia Pictures animated logo--by setting the start point of the movie just past the logo.

After this I backed up Close Encounters in RB using CCE's MPEG matrix and applied UnDot() & Deen("a3d",1,10,14,6). The source cleaned up pretty good and as far as I know, the output plays but I haven't watched the entire movie, though I have skipped to several parts of the movie and all appears OK.

But what concerns me is that I received SCR timing errors about half way through the Rebuild stage. I had this crop up before but didn't note it. It's not something that occurs all that often, only seldomly.

But is this timing issue a cause for concern?

Here's my log of the backup:

[06:53:48] One Click encoding activated...
-----------------
[06:53:48] Phase I, PREPARATION started.
- CCE SP 2.70.2.1 encoder selected.
- AVS Filters are enabled.
- VTS_01: 2,253,216 sectors.
-- Scanning and writing .D2V & .AVS files
-- Processed 196,794 frames.
-- Building .AVS and .ECL files
- Reduction Level for DVD-5: 99.2%
- Overall Bitrate : 4,972/3,978Kbs
- Space for Video : 3,985,470KB
- HIGH/LOW/TYPICAL Bitrates: 4,823/1,686/3,978 Kbs
[06:56:15] Phase I, PREPARATION completed in 3 minutes.
[06:56:15] Phase II ENCODING started
- Creating M2V for VTS_01 segment 0
- Creating M2V for VTS_01 segment 1
- Creating M2V for VTS_01 segment 2
- Creating M2V for VTS_01 segment 3
- Creating M2V for VTS_01 segment 4
- Creating M2V for VTS_01 segment 5
- Creating M2V for VTS_01 segment 6
- Creating M2V for VTS_01 segment 7
- Creating M2V for VTS_01 segment 8
- Creating M2V for VTS_01 segment 9
- Creating M2V for VTS_01 segment 10
- Creating M2V for VTS_01 segment 11
- Creating M2V for VTS_01 segment 12
- Creating M2V for VTS_01 segment 13
- Creating M2V for VTS_01 segment 14
- Creating M2V for VTS_01 segment 15
- Creating M2V for VTS_01 segment 16
- Creating M2V for VTS_01 segment 17
- Creating M2V for VTS_01 segment 18
- Creating M2V for VTS_01 segment 19
- Creating M2V for VTS_01 segment 20
- Creating M2V for VTS_01 segment 21
- Creating M2V for VTS_01 segment 22
- Creating M2V for VTS_01 segment 23
- Creating M2V for VTS_01 segment 24
- Creating M2V for VTS_01 segment 25
- Creating M2V for VTS_01 segment 26
- Creating M2V for VTS_01 segment 27
- Creating M2V for VTS_01 segment 28
- Creating M2V for VTS_01 segment 29
- Creating M2V for VTS_01 segment 30
[09:51:52] Phase II ENCODING completed in 175 minutes.
[09:51:52] Phase III, REBUILD started.
- Copying IFO, BUP, and unaltered files...
- Processing VTS_01
- Reading/processing TMAP table...
- Rebuilding seg 0 VOBID 1 CELLID 1
- Rebuilding seg 1 VOBID 1 CELLID 2
- Rebuilding seg 2 VOBID 1 CELLID 3
- Rebuilding seg 3 VOBID 1 CELLID 4
- Rebuilding seg 4 VOBID 1 CELLID 5
- Rebuilding seg 5 VOBID 1 CELLID 6
- Rebuilding seg 6 VOBID 1 CELLID 7
- Rebuilding seg 7 VOBID 1 CELLID 8
- Rebuilding seg 8 VOBID 1 CELLID 9
- Rebuilding seg 9 VOBID 1 CELLID 10
- Rebuilding seg 10 VOBID 1 CELLID 11
- Rebuilding seg 11 VOBID 1 CELLID 12
- Rebuilding seg 12 VOBID 1 CELLID 13
- SCR TIMING ERRORS found in source
-- Corrections were approximated
- Rebuilding seg 13 VOBID 1 CELLID 14
- Rebuilding seg 14 VOBID 1 CELLID 15
- Rebuilding seg 15 VOBID 1 CELLID 16
- Rebuilding seg 16 VOBID 1 CELLID 17
- Rebuilding seg 17 VOBID 1 CELLID 18
- Rebuilding seg 18 VOBID 1 CELLID 19
- Rebuilding seg 19 VOBID 1 CELLID 20
- Rebuilding seg 20 VOBID 1 CELLID 21
- Rebuilding seg 21 VOBID 1 CELLID 22
- Rebuilding seg 22 VOBID 1 CELLID 23
- Rebuilding seg 23 VOBID 1 CELLID 24
- Rebuilding seg 24 VOBID 1 CELLID 25
- Rebuilding seg 25 VOBID 1 CELLID 26
- Rebuilding seg 26 VOBID 1 CELLID 27
- Rebuilding seg 27 VOBID 1 CELLID 28
- Rebuilding seg 28 VOBID 1 CELLID 29
- Rebuilding seg 29 VOBID 1 CELLID 30
- Rebuilding seg 30 VOBID 1 CELLID 31
- Updating NAVPACKS for VOBID_01
- Updated VTS_C_ADT.
- Updated VTS_VOBU_ADMAP.
- Updated IFO: VTS_01_0.IFO
- Updating TMAP table...
- Correcting VTS Sectors...
[10:00:11] Phase III, REBUILD completed in 9 minutes.

Done.
[10:00:11] PREPARE/ENCODE/REBUILD completed in 187 min.

[jdobbs]

That means that there were places in the source disc that are in error. As DVD-RB is reading the audio source it is checking to ensure that the SCR/DTS/PTS times are consistent. This warning is telling you that PTS (presentation time stamp) for at least one of the original audio packets is falling at a time earlier than the SCR (system clock reference). That means that the packet would arrive too late to playback at it's designated time -- in other words it doesn't pass a sanity test. Since DVD-RB normally uses the original audio streams unchanged, it wants you to know about it.

The error could be on the original disc, or could have been created by Shrink -- no way I can tell on a preprocessed source.

The good news is that when DVD-RB encounters a problem like that, it tweaks the SCR in order to correct it. That should work most of the time, but only playback can tell.

[jptheripper]

you'd be better off doing a movie only in rebuilder and blanking the credits, logos there

then you can avoid shrink completely

[Aquilonious]

you'd be better off doing a movie only in rebuilder and blanking the credits, logos there. Then you can avoid shrink completely
With Shrink you can set the precise start and end point of the movie. You can't do this with RB. You can blank segments, but in many cases logos are incorporated into the first movie segment. If you blank the logo you also end up blanking part of the movie.

@jdobbs - You're right--the only way is to watch the movie all the way through. I will view the movie sometime this week. It could be my source disc as it isn't in the best condition, but I've had worse discs.

I know there are no guarantees, even with pressed discs. Disc 3 of my Dirty Harry collection skipped like mad on my old Samsung player but not my new Philips. It was the only pressed disc the Samsung wouldn't play correctly, so I know it was the disc. This is only one of many reasons why I like to make backups of the movies I purchase.