Just can't sync them!

[Anonymous]

Here is my simple problem wich I'm having nightmares trying to solve. By the way I LOVE your software. I have to admit that I was skeptical at first but is now a must have :)

Ok first I cut my file in VideoRedo. The output file is in perfect sync. But when I demux the file (so I can edit the .mp2 track) and remux them, it's badly off sync. Played with some settings in TMPGEnc but just does not want to sync!! VideoRedo tells me * Input Sequence Errors : 355 but have no clue what it means. And by the way I recorded the file 640x480 so DVDLab doesn't let me import it directly. So I need to recompress it via TMPGEnc but with no success as it always gets the video crappy and off sync. ANY help would be greatly appreciated! Thanks alot!

Rick

[DanR]

Here is my simple problem wich I'm having nightmares trying to solve. By the way I LOVE your software. I have to admit that I was skeptical at first but is now a must have Thanks.

You raise a number of questions here:

1) How are you editing the MP2 file? When you demux you lose all timing and sync information, espeically in the audio file. So you MUST insure that your edits don't result in a net change of timing. For example if you replace 500 msec of program material in the middle of the file, you have to replace it with EXACTLY 500 msec of material.

2) What program are you using the remux the file? VideoReDo will have this feature in the next few weeks.


3) Have you tried using VideoReDo's manual sync adjustment (Tools>Audio>..) to bring your new file back into sync?

[Anonymous]

Hi! Thanks for your fast reply!! Very appreciated!

1) How are you editing the MP2 file?
I use Adobe Audition with an imported filter (since it dosen't support MP2 by default). And by editing I mean ajusting the amplitude/normalizing, equalizing etc.. not removing or adding audio information and even when I don't edit the file, once remuxed everything is off sync.

2) What program are you using the remux the file?
I use TMPGEnc. To demux and remux. And as said, VideoRedo outputs a perfect sync file, but as soon as I demux it, everything is of sync and the video is blurry. I use the DVD template and barely touch any settings.

3) Have you tried using VideoReDo's manual sync adjustment (Tools>Audio>..) to bring your new file back into sync?
No because the audio dosen't seem to be the only problem. As soon as the file is demuxed, the video quality is blurry and audio off sync. But each time I do a QuickFix or recut the file by VideoRedo (on the original file), I get the * Input Sequence Errors : 355 message which may be or not a problem.

Thanks again for your help!

[DanR]

The input sequence errors indicate that some video frames are not present where expected. For example, a B frame without a preceeding P frame. There is much more detail on this in the VideoReDo.log file. If you like, send to us, as an attachment, to support@videoredo.com

[Anonymous]

Ok I'll send you the log as soon as I can!
But concerning the input sequence errors, isn't that kind of error that VideoRedo is supposed to fix? I may be wrong!

[DanR]

But concerning the input sequence errors, isn't that kind of error that VideoRedo is supposed to fix? I may be wrong!An input sequence error means there is missing information such as missing I or P frame. We fix it by removing all the subsequent frames that would have required the missing frame to play back properly. This will minimize or eliminate the amount of pixelation and other artifacts you will see. Then we remove the corresponding audio frames so that everything will stay in sync.

[Anonymous]

That's what I tought! But here's the scenario. I take File1.mpg, VideoRedo it. It tells me 355 input sequence errors and generates me File2.mpg. But then I do a QuickFix on File2.mpg and still get the sequence errors. It's if as it detects the errors but don't fix them. Is this normal? Thanks again for your fast replys! Incredible support :)

[DanR]

No, that's not normal, could be a bug in VideoReDo. Which build are using running? That latest beta build #249 has some fixes to QuickStream Fix, but doesn't sound like this is one of the issues. If you have the time, I suggest you try it. You can find it here: ftp://videoredo:videoredo@ftp.drdsystems.com/Betas/

[Anonymous]

Downloaded the latest beta and still got the input sequence errors. Sent you the log file by mail! Thanks!

[DanR]

Got it, please see reply via EM.

[Anonymous]

Hi! Did you get the file? And did you find anything wrong? Thanks!

[DanR]

Just got a chance to look at the file. And here's the situation. There are actually two different types of errors that occur multiple times in the file.

1) There are numerous situations where the temporal references are duplicated on different frames in the same GOP. The temporal reference is the order in which a frame is to be displayed. Duplicate references are not allowed, but since they aren't usually fatal, VideoReDo leaves them alone. In build 244+ VideoReDo will not only detect this, but will fix them. Therefore if you pass the file through VRD (build 244+) it will remove all these problems.

2) However, there are also some situations where the temporal references are out of order. In the clip you uploaded there are 2 such situations. These are not detected on the first pass since the error logic bypassed them once it encountered the first error. Therefore if you remux the stream again these will be removed. These types of errors may cause some frame loss and eventual resyncing, can't say for sure since the input you sent only has 2 of these types of errors.

Bottom line is to use a later beta. How was this video captured? There are a lot of these temporal errors and it might indicate some problem with the source.

One more thing. Build 248/249 has a problem (that's why there are betas). Build 250 will be posted by tomorrow. If you can wait, please use that version.

[Anonymous]

I think it worked.. Well actually, I remuxed the video as you told me and the errors were gone (With beta 249 and 250). So 'theoreticaly' I have an error free file. But I tried recompressing the file with ProCoder, Tmpgenc and both with no succes. I still get an out of sync output. I just don't get it. The file plays perfectly in any player but as soon as I want to recompress it to make it fit on a DVD, program or elementary stream, bang, out of sync file. There must be some way of doing this! It's now been 2 weeks I'm on it! Getting really frustrated here!!! But since VideoRedo seems to output the file correctly, I guess this problem isn't on your side anymore :\

BTW I recorded the file with PowerVcr II with an ATI Wonder Pro capture card.

Thanks alot for all your help!

[DanR]

Glad the new version works. Please don't use #249, only #250, #249 can cause a sync problem.

Regarding your after recode sync problem, perhaps VRD can help you out. Is the sync a constant amount off or does it drift over time? Why not take the out of sync program and use VRD's manual sync adjustment to bring it back into sync?

[Anonymous]

Ok here some updates!
First the audio sync issue is a gradual shift thing so the tool in VideoReDo can't fix it. BUT.
I imported the original mpg in Vegas 5, and also imported the recompressed mpg into it (2 audio tracks and 2 video tracks). Now I found that both audio tracks are perfectly in sync. But the video tracks aren't! One video track is longer than the other one (by about 10seconds)! So I can play mpg1 audio with mpg1video and it's in sync. I play mpg2 audio with mpg1 video still all in sync. But mpg2 audio + mpg2 video = off sync! So there's someting going wrong in the recompress thing. Have you any idea what might cause this? Thanks!!!

[DanR]

Why don't you upload the first 20MB of your MPEG2 video to our FTP site and I'll take a look at it: ftp://videoredo:videoredo@ftp.drdsystems.com/uploads/

You can use the Tools>Trim to extract the material. This will perserve the original bytes.[/url]

[Anonymous]

? Well I already uploaded the first 30mg of it last week can't you use this file? And by the way I found a way to resolve this issue! I used Vegas to bring in the original mpeg, frameserve it to procoder and voila! Vegas dosn't seem to lose sync when rendering so frameserving it to procoder gives me that file I was wanting for 2 weeks now!

First of all, I'd really like to thank you for your help and the time you spent helping me (and the others!). As a thanks, I'm going to send you an email this week with something you might like :)

See ya!

[DanR]

Couple of thing:

1) I didn't connect your 30mg_file.mpg with this message. I use an internal naming scheme here based on a person's name or handle to store and retrieve uploaded files. It slipped through.

2) Your file doesn't contain any "syncable" content. The music and voice don't really connect to the video. The sync could be off by 1/2 a second and one couldn't tell. Perhaps a clip with someone speaking or a door closing would be more useful.


I'm going to send you an email this week with something you might like Can't wait :)