Create DVD makes small DVD

therat

New member
I am using VRTVS beta 566. I started with an .mpg file 4,519,700,484 bytes in size, perfect for a single DVD-5. I loaded the mpg file in TVS and clicked "Create a DVD". On t6he next screen it showed a "minor re-encode" was necessary. 36 minutes later it was complete but the VIDEO_TS folder is only 3,701,301,248 in size.

Any idea why it created such a small DVD when I didn't want any re-encoding at all?

cheers
 

phd

Super Moderator
It would not have performed a complete reencode in 36 minutes.

What was the minor reencode for?

Was this file to be processed as-is or was there editing also?

Did the file contain multiple streams?

Does the length of the finished DVD look the same as the original file?

Was the audio converted from LPCM to MPEG?

Was the audio bitrate lower on the DVD?
 

therat

New member
It would not have performed a complete reencode in 36 minutes.
Sorry that should have been major transcode

What was the minor reencode for?
Output quality - DVD 4.34 Mbps

Was this file to be processed as-is or was there editing also?
As is, no editing at all.

Did the file contain multiple streams?
No

Does the length of the finished DVD look the same as the original file?
Yes

Was the audio converted from LPCM to MPEG?
Original audio was AC3

Was the audio bitrate lower on the DVD?
No it sounds the same
 

therat

New member
This is bizarre. I first tried opening the .mpg file and snipping a couple of seconds off the start and clicked "Add title to DVD". The ensuing DVD was almost exactly the same as the first one.

I then tried as you suggested using double layer as the output size. This time when I opened the .mpg file there were no warnings and the DVD was created in a few minutes with a VIDEO_TS folder size of 4,549,634,048 bytes. Perfect for a DVD5.

So why did it transcode a file that didn't need it to fit on a DVD and reduce it by so much?
 

phd

Super Moderator
The file is being interpreted as slightly oversize and is being reencoded.

I am surprised it completed in 36 minutes. What are your system specs?

Try the latest Beta as well as an uninstall/reinstall.

Also reduce the size:
51. MBytes to pad when estimating DVD size
 

therat

New member
The file is being interpreted as slightly oversize and is being reencoded
Yep I realize that, but why resize it by so much? It only needed to be reduced by 100mb at the most not 800 mb.

I am surprised it completed in 36 minutes. What are your system specs?
Intel Core 2 Quad Q9550
Gigabyte GA-EP45-DS3R
4 g DDR2 RAM
Palit Radeon 4850 512mb PCIe
2x500g Seagate SATA2 Hard Drives

Try the latest Beta as well as an uninstall/reinstall.
Ok I'll try it. In the past I've just installed over the top but I'll do a full uninstall/reinstall.

Also reduce the size:
51. MBytes to pad when estimating DVD size
What do you suggest I reduce it to? Default seems to be 50. Do I try 30?
 

therat

New member
I tried changing that padding number to 40, 30 20 and 10 but the overall size never changed in the "Create DVD" dialog. Stayed at 4.63 gig. That meant a major transcode needed :( No idea why it is so big when the file is only 4.37gigs and I'm not creating a menu.

Trying it now. Will post the results
 

therat

New member
No change to output size. Even using as low as 10mb padding, the output size is still only 3,722,610,688 bytes. BTW total transcoding time was less than 25 minutes.
 

therat

New member
There is obviously a bug in the way VRDTVS calculates the estimated size of a dvd. As an experiment I created 2 DVDs from recorded TV shows using Tsunami MPEG DVD Author. I also took out backups of 2 movies I had on single dvd5s and ripped them to my hard drive. All 4 of these movies were ~4.33 - 4.37 gigs in size. I loaded each one into VRDTVS through "File -> Open Title from a DVD". I then clicked "Create DVD". To my amazement every one of the dvds came up with an estimated size of 4.63 gigs and all required a Major Transcode.

There is obviously something wrong when DVD5s show as being considerably oversized when they comfortably fit on a single DVD5.

I don't know how long this problem has existed as I haven't used the dvd features in the past just the editor and joiner.
 

Dan203

Senior Developer
Staff member
OK we need to determine if the DVD dialog or VRD itself is miscalculating the output size. Do me a favor, load the video back into VRD, then in the lower right click the "Switch" button. What does it list in the "Output" box? (it's in MB) If the value there is too high then we know it's the VRD estimate causing the problem. If not then we know it's something in the DVD dialog messing up.

Edit: I just looked and the main VRD UI will report MB as 1024x1024 but the DVD dialog uses 1000x1000, so the numbers will be different but we can cross calculate to figure out where the error is. (all actual calculations are done in bytes, so this difference is not the cause of the issue, just a display difference)

Dan
 
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therat

New member
Hi Dan,

Output shows as 4,310.32 MB which (in theory anyway) should easily fit on a DVD5 without re-encoding/transcoding.
 

Dan203

Senior Developer
Staff member
OK I think I found the problem. There is code in the DVD dialog which assumes a 2% overhead for muxing, however that's only necessary when dealing with elementary streams, like when the video is being transcoded, and not when the video is already compliant. So I've modified the code so that it only applies when needed, which will hopefully get video which are right on the edge like this under the mark.

The fix should be in the next beta build.

Dan
 
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therat

New member
OK I think I found the problem. There is code in the DVD dialog which assumes a 2% overhead for muxing, however that's only necessary when dealing with elementary streams, like when the video is being transcoded, and not when the video is already complaint. So I've modified the code so that it only applies when needed, which will hopefully get video which are right on the edge like this under the mark.

The fix should be in the next beta build.

Dan
Thanks Dan, great news.

cheers
 

therat

New member
well I installed the latest beta - 568 - and it is still exactly the same. It still shows the output size as 4.63gigs and a Major Transcode needed. The end result is again 3,701,xxx.xxx bytes :(

I was hoping this would be fixed in this version. Back to the drawing board.
 

Dan203

Senior Developer
Staff member
Sorry I messed up and forgot to submit the change, so it didn't make it into 568. It will definitely be in the next release.

In the mean time you can just lie to the DVD dialog and tell it you're burning a dual layer instead. The DVD burner itself doesn't care which option you picked it just compares the size of the VIDEO_TS folder to the size of the disc, if it will fit then it proceeds with the burn.

Dan
 

therat

New member
Sorry I messed up and forgot to submit the change, so it didn't make it into 568. It will definitely be in the next release.

In the mean time you can just lie to the DVD dialog and tell it you're burning a dual layer instead. The DVD burner itself doesn't care which option you picked it just compares the size of the VIDEO_TS folder to the size of the disc, if it will fit then it proceeds with the burn.

Dan
thanks Dan.

Just a question tho, if i choose dual layer, won't VRDTVS insert a layer break in the output (even tho it doesn't need one)?

The reason i ask is that it thinks the output is 4.63 gigs and therefore won't fit on a DVD5.

cheers
 

Dan203

Senior Developer
Staff member
No, the layer break is added by the burner not by the authoring stage.

Also, as I said above, the GB value in the DVD dialog is in 1000000000 byte units, so 4.63GB is actually 4630000000 bytes and will fit on a DVD-5 just fine. (the reason it's not the full 4.7GB is because of the artificial padding)

Dan
 
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