Validating .VOB ==> .MPG Conversions?

PeteCress

New member
I'm in the process of converting hundreds of server-based native DVDs (i.e. .VOB, .IFO....) to .MPEG.

So far, I'm validating each conversion by:

  • Verifying that the language is English by listening to a few words here and there
  • Scrolling to the end and checking for the film's "The End" or credits.
i.e. The only two things I can think of that can go wrong are that the conversion did not finish and/or the wrong language track was converted.

Can anybody suggest anything else that might go wrong and would not be obvious to somebody doing the above brief checks - and how to check for it?
 
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phd

Super Moderator
VideoReDo does not decrypt commercial DVDs.

Your checks sound like a good qwuick and dirty method.
 

PeteCress

New member
VideoReDo does not decrypt commercial DVDs.

Your checks sound like a good qwuick and dirty method.
Thanks.

The DVDs in question are not encrypted.

So far, with about 200 done, I'm running just shy of 20% showing up with the language bug.

One problem: I just discovered that a .MPG can have English in two places that I spot check, but French in a third.... So all the ones done/checked so far are back in the "Suspect" que.

So quick-and-dirty isn't going tb so quick any more....

An approximate date for the bug fix version would be helpful bc maybe if it's not too far in the future, I can just put this project on hold until it comes out.
 
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Dan203

Senior Developer
Staff member
There are a few things to watch out for when processing DVDs...

1) VRD does not support DVD subtitles, and some movies use subtitles to display foreign languages being spoken in just parts of the movie. For example in Star Wars when the aliens speak the audio is alien, but the DVD will display English translations as subtitles. If you process the DVD with VRD it will lose those subtitles and you wont be able to tell what they are saying.

2) VRD does not support multiple angles. Only a few movies I know of use these, but if you run into one then you will get syncing errors and weird stuttering in the output video. The reason for this is that DVDs store multiple angles interleaved with frames from each angle containing the same timestamp. There is a special packet in the VOB which tells a DVD player which one to read and which ones to ignore, but VRD does not support reading of those packets so it tries to process all the frames from all angles at once and gets confused.

3) VRD does not support DTS audio. Not many DVDs use DTS exclusively, but there are a few. If you run into one it will pick any audio stream it can find that uses a codec we do support regardless of your selection, so it may get the wrong stream.

Dan
 

PeteCress

New member
3) VRD does not support DTS audio. Not many DVDs use DTS exclusively, but there are a few. If you run into one it will pick any audio stream it can find that uses a codec we do support regardless of your selection, so it may get the wrong stream.
Would that be the likely cause of my getting French or Spanish instead of English on my problem DVDs?

Or is the bug alluded to earlier in the thread - and tb fixed in the next release - something different?

OOPS!... Just saw that this was answered in another post... but I can't see how to delete this response...
 

Dan203

Senior Developer
Staff member
If the DVDs have DTS audio then you will still get this effect even when the fix is released.

Although I just looked at the IFO parsing code and it ignores DTS streams, so if you're opening these via the Open Title From DVD function then you wont even have the option to select a DTS stream.

Dan
 
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