Audio sync problems with standalone dvd-player XVID files.

[AndersC]

Hi,,first of all Im this is the right place for this question. Could be considered audio or dvd-player question.

I have a cheap-ass Matsui 230 DVD-player that I basically bought just to play xvid/divx files on. When playing certain xvid-files it has a rather large audio sync problem. The sound comes later then the image up to almost a second difference. The same files plays properly on my comp. My amp doesnt have an audio sync function so no help there.

I have checked some xvid that works and compaired it to some that doesnt. From what I can see there might be a problem with "aligned on" vs "split across" interleaves!?! Also "packed bitstream" vs hmm,,not packed?

Firs off I have no idea what those things mean. However this type works fine:
OpenDML (AVI v2.0)
DivX Style "packed bitstream" AVI
Interleave: 1 vid frame (42 ms), preload=504
Audio frames: Aligned on interleaves

codec: 0x0055(MP3, ISO) MPEG-1 Layer 3
48000Hz 114 kb/s total (2 chnls) LAME3.93a*

This doesn't:
OpenDML (AVI v2.0)
Interleave: 1 vid frame (42 ms), preload=24
Audio frames: Split across interleaves

codec:0x0055(MP3, ISO) MPEG-1 Layer 3
48000Hz 132 kb/s total (2 chnls)

Is there a simple way of changing the one that doesn't work to the one that does work assuming that this is the problem?

I have searched the forum but didn't really find anyone with similar problem or solution. Maybe Im crap at searching,,should be a fairly common problem,,,or?

Can anyone help?

/Anders

[redwudz]

Check the non working videos for MP3 VBR audio. You can drop it into VirtualDub Mod and it should tell you right away. Other than that, I have no idea.

And welcome to our forums.

[celtic_druid]

114k and 132k. They are both VBR.

Check with MPEG4Modifier. See how many bframes, whether there are any N-VOP's, etc.

[AndersC]

Hi thanks for the input.

Ok,,,I tried the mpeg4-modifier this is the info I got:

Not working:

Packed bitstream: No
QPel: No
GMC: No
Interlaced: No
Aspect ratio: Square pixels
Quant type: H.263

I-VOPs: 854 (1,37%)
P-VOPs: 61586 (98,63%)
B-VOPs: 0 (0,00%)
S-VOPs: 0 (0,00%)
N-VOPs: 0 (0,00%)

XviD0012


Working:

Packed bitstream: Yes
QPel: No
GMC: No
Interlaced: No
Aspect ratio: Square pixels
Quant type: H.263

I-VOPs: 667 (1,04%)
P-VOPs: 31958 (49,92%)
B-VOPs: 31393 (49,04%)
S-VOPs: 0 (0,00%)
N-VOPs: 0 (0,00%)

Max consecutive B-VOPs: 1

DivX999b000p
XviDD00037

Ok I dont really know what all this means but does it help any of you to understand why one works and the other doesn't. I guess my dvd-player likes a "packed stream" whatever that means.

Thanks again for your help.

/Anders

[guns1inger]

2 files does not a representative sample make. I would try a few more before jumping to any conclusions.

[AndersC]

gunslinger: I have 2 different batches of files. One batch works all 12 files all seemingly done in the same way. Another batch of 22 files all done in the "non-working" way. So Im assuming it's not a problem with the files themselves just a problem of compatebilety with my dvd-player. Again all files work fine on my comp.

/Anders

[celtic_druid]

You can't have packed bitstream without bframes. It isn't needed anyway. Packed bitstream was basically created to get around the limitations of VfW in dealing with bframes.

XviD0012 suggests that the files are quite old. Early 2003 from recollection. Probably just poorly created. VBR audio is fine most of the time, but things can and do go wrong.

[AndersC]

Celtic_druid: most of what you wrote I have no idea what you mean. Im not well versed in this type of termonology. Do you have an idea of what I might try to make it work?

Thanks

/Anders

[guns1inger]

avirecomp will re-encode them to standard playable spec (removes Qpel/GMC, re-encodes with newer version). It probably uses virtualdub to do the work, so you could do the same thing with a fast recompress to the lastest xvid. Avirecomp just removes the need for you to know the codec settings yourself.

[angels90]

I had this prob too with some Divx and xvid avis, audio would drift on my standalone dvd (lg 7823) but played fine on my computer .

Gspot told me the audio was split too. I ran it through vdub, made sure "interleave audio every" option was set to frames, full processing mode, compression to mp3 and saved it off but did a direct stream on the video. It reprocessed the audio without (i think) touching the video and fixed the problem on my standalone in double quick time.

Now all I got to do is fix the jittering when things move ...

[manono]

Although it's unclear to me what the common problem is among those that get out of synch, you said those that were interleaved like this:

Interleave: 1 vid frame (42 ms), preload=504

worked, while those that were interleaved like this:

Interleave: 1 vid frame (42 ms), preload=24

didn't work. If that's the difference between those that worked and those that didn't, then the first one is the default preload/interleave setting, and by opening the non-working AVI in Nandub or VDubMod (and answering "No" to the question), and then direct streaming both the audio and video, you may get working videos without reencoding anything. It's worth a try with a CD-RW.