Video File Size Questions

Shutterbug55 wrote on 10/19/2016, 6:08 PM

Hello: I have a project that is 1:40:00 long. When renered in Vegas Studio as an MPEG-2, it is over 4 gig and will not fit on the DVD. I tried rendering the file with Quicktime and the file size was 2.5 gig. However, when I inport it into DVD architect, it shows 6.3 gig and will not fit. Can anyone explain to me why a 2.5 gig file is showing up as a 6.3 in DVD archietect? Please help. Thanks

Comments

set wrote on 10/19/2016, 6:24 PM

Which DVD rendering template do you use? The included default bitrate gives you 6 Mbps, which is too high to fit.

According to my calculation for 1h40m00 duration, use bitrate 5.57 Mbps.
(select the DVD architect template, then 'Customize Template', then find the 'average bitrate', and set it to 5,570,000. (or 5,500,000)

Quicktime format might not compatible to DVD format specification which requires MPEG2, so the DVDA will need to convert.

I still depends on Adobe Encore's planning guide for DVD / BD disc planning.

Grazie wrote on 10/25/2016, 11:50 PM

Set's instructions and advice are correct. But what I want to add are some reflections on your possible observations and decision making.

1/- I have made many DVDs that are over 4gb. However, they need to be under 4.7gb and mostly I try to go 4.5gb giving plenty of headroom.

2/- Did you decide to make the QT file because it was less than 4gb? If so then DVDA will attempt to re-render to the format it needs to comply with a DVD. And that means MPG2, for the Video stream, and AC3 for the Audio stream. Problem here is that you may have reduced the quality by going to a substantially lower bit rate than you need to do. And then it would get re-rendered. Not ideal.

3/- In the past DVDA has been less than accurate at reflecting the correct size. My guess here is that it is attempting to readjust that QT file to make the re-render.

if you DO know this already then I apologise.

Bottom line here is that DVDA will comfortably produce a quality DVD which is 100 minutes long. However, you are knocking against that 4.7gb DVDA ceiling. And remember it's the BITRATE that gobbles up space on your DVD. And most likely you're employing a high bitrate that is unnecessarily overkill.

i enjoy tweaking DVD recipes. I know, with other distribution and distributing formats are available, it's a "challenged" format, but my clients still want it.

Quitter wrote on 10/26/2016, 3:39 AM

Since DVDA estimates the size wrong, I let DVDA first make an iso image.
If that fits, I burn it with another program on DVD

Shutterbug55 wrote on 10/26/2016, 4:37 PM

Thanks:

Lowering the Bit Rate when rendering in Vegas did the trick. The loss of quality was not that significant.

Thanks again.