Glitches and Freezes Around Layer Break

[QueenMaro]

Hi,
I have the problem that I get glitches and freezes just before and after the layer break on a brim full video DVD+R DL.

Any suggestions are welcome...
Thank you Q.M. :confused:


Reathoring / Burning procedure:
- I have a reauthored video (Lord of the Rings special extended edition) that I joined and shrinked to a full DVD+R DL.
- I used VobBlanker to split one cell exactly in the middle (sectors for both layers nearly match +- 10)
- I used PgcEdit to set the layer break and create an ISO
- I used ImgBurn to write the ISO (all programs are newest versions)
- Media: Verbatim DVD+R DL 2.4x (book type set to DVD-ROM)
- Writer: brand new NEC ND-4570A
- ISO and burned DVD plays flawless on PC
- Glitches and freezes around layer break +- 90sec happen on 3(!) stand-alone players (2xSony 1xPioneer)

[setarip_old]

Hi!burned DVD plays flawless on PC
- Glitches and freezes around layer break +- 90sec happen on 3(!) stand-alone players (2xSony 1xPioneer)Are the three standalone players older (more than 1 year old)? If so, they might not be very "tolerant" of burned D/L media.

Have you tried running a DVD/CD cleaning disc on the players? Maxell makes one that sells for approximately $10US...

[QueenMaro]

One of the 3 is a quite new (0.5 year) Sony. As the error happens on all players at the same position, I think there might be something wrong with the video command structure...

Precisely the glitches are not in the image but the video players just jump backwards some 5...10 seconds creating an infinite loop.

[r0lZ]

Have you experienced that problem with another DVD, or is it specific to this compilation?

You said that you have joined 2 DVDs. How?
If the layer break is at the join point, it might be a problem with the method you used to join the two parts.

Also, have you used the Seamless Layer Break option in PgcEdit?

Anyway, the most probable cause of this kind of problem is a bad burn or a bad media. Try to examine the PI/PO errors with DVDInfoPro or Kprobe.

[voo_doo99]

I, too, would be interested in the procedure you used to join the 2 DVDs. Also, what was the compression ratio and the final picture quality?

Anyhow, it seems to me the technique of splitting a cell for a layer-break point would be problematic. Was it possible to use the original LB point from Disc1?

[QueenMaro]

OK :goodpost: ,
first thanks a lot. I will examine the burn quality with DVDInfoPro or Kprobe (I hope the NEC burner supports PI/PO error reporting...).

Could you please give me some explanation about the "seamless layer break" option. I have read lots of pages but do not fully understand this.
This may solve the case. Alle orig chapters have the flag "STC discontinuity" and/or "seamless playback joint". But the chapter (start) I used as layer break has none of this flags (byte0 0x00, byte1 0x00)...

The joining itself is not the problem (joining point is far away from layer break). The original LB point from disk1 WAS also far far away and therefore not usable...
For details on joining just contact me ;)

[r0lZ]

(I hope the NEC burner supports PI/PO error reporting...)
I have also a NEC. Kprobe doesn't work, but DVDInfoPro works fine. Anyway, DVDInfoPro is a good tool to use in combination with ImgBurn. It is not free, however.

Could you please give me some explanation about the "seamless layer break" option.
To be fully standard compliant, the layer break must have the Seamless Joint flag clear, the STC discontinuity flag set, and a change in VOB ID. (The VOB ID change implies the STC discontinuity.) But I have many commercial DVDs with no VOB ID change and the STC discontinuity flag clear. (I have just ripped Lars Von Trier's Manderlay, zone 2 Benelux and it is a good example of this kind of non-compliant layer break.)
IMO, the STC discontinuity flag is not really important, and I've never heard of a problem if it is clear at the layer break. Anyway, you should never change it manually, since it reflects the way the cell is muxed.

The seamless joinf flag is more important, because, when it is clear, the player is supposed to pause for one second or two before playing the next cell. This pause is theoretically needed so that the laser has some time to refocus on the second layer. But again, there are some commercial DVDs with the seamless joint flag set on the layer break cell (notably the Superbit DVDs.) On modern players, it is therefore possible to play the DVD without the pause. This method might require a special muxing technique (low mux rate) to help the players, but that's not totally confirmed.
Anyway, you should try the "Seamless Layer break" option with care. This option sets the seamless joint flag (instead of clearing it) on the layer break cell, if it's possible.

For more info on the Seamless Layer Break, see here (http://forum.doom9.org/showthread.php?p=819669#post819669).