Predicting rendering size - impossible question ??

FoskeyMedia wrote on 6/4/2015, 9:36 PM
I know the answer is NO, but I'm going to ask it anyway, and maybe SOMEDAY it will be a feature in vegas.....

Is there a way in Vegas to tell how large your file will be once rendered. I don't know much about rendering and almost always use the presets. I render almost everything for YouTube. But occasionally I'll need to burn a DVD and often come up with a file too large to burn. It would help of I knew this ahead of render and could make adjustments to have it come out....just right.


wwaag wrote on 6/4/2015, 9:44 PM
I know the answer is NO

You'll be happy to know you're wrong. There are lots of bit rate calculators available for doing this. Enter in the size of your intended media (DVD, single layer, 2 layer, etc.), the length of your video, and it will give you the bitrate you should use when rendering from Vegas. Perhaps someone who is currently doing this will give specific tool recommendations. If not, go to Videohelp and under tools, look for bit rate calculators.


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Former user wrote on 6/4/2015, 9:47 PM
As wwaag said, there are calculators that will help. File size is all math: length of program and bitrate. Variable bitrate throws a few kinks, but the calculators can give a pretty good estimate of these as well.
BruceUSA wrote on 6/4/2015, 9:48 PM
Use Mark bite rate calculator. Free download

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FoskeyMedia wrote on 6/4/2015, 10:00 PM
Great.. thanks
I'm tired of getting to DVD A and finding out the file size is too big. I was JUST getting ready to render when I thought I'd check back.
rs170a wrote on 6/4/2015, 10:21 PM
I've been using that one for a very long time and it works great.

I make a few changes to the default settings by clicking the Settings button (lower left) on the main screen.
Click 1 Kilobit = 1024 bits.
Set the Default Audio Encoding to 192 Kb/s (this is the default for AC-3 audio encodes).
Change the Safety Margin from 1% to 5% (I like to give myself a bit of extra room).

My rule of thumb is to go no larger than a CBR of 8,000,000 for less than a 70 min. DVD.
Anything larger and I use a bitrate calculator to determine optimum settings.
Some folks say that you can go as high as 8,500,000 but I stick to my rule.
I've burned thousands of DVDs over the years and have have never had any returned to me.

Steve Mann wrote on 6/5/2015, 5:09 PM
"I'm tired of getting to DVD A and finding out the file size is too big."

Right-click on the the mpg and ac3 files. Select "Properties". If the two files total less than 4.7Gb then you are good to go.

You should never let DVDA recompress your file - use a bitrate calculator and do it right in Vegas.
musicvid10 wrote on 6/5/2015, 8:46 PM
Total Bitrate (Mbps) X Time (Sec) X .125 = File Size (MB)

fldave wrote on 6/5/2015, 9:14 PM
No. Not necessarily. Rendering to a codec like HuffYUV, lossless, compressed. I've ended up with 30GB files and 240GB files. If you are dealing with intermediaries, it all depends on the clarity of the original video, any de-noising, etc.

If you are talking rendering to MPG2, MP4, final output, then those calculators should work fine.
musicvid10 wrote on 6/5/2015, 9:36 PM
Whose post were you responding to?

fldave wrote on 6/5/2015, 9:47 PM
Original post, in general. Not DVD specific.
Zelkien69 wrote on 6/5/2015, 9:56 PM
Not impossible as this one will give you the final size on it's progress screen.

Great software and a new levels plug in
musicvid10 wrote on 6/6/2015, 8:27 AM
If you know the total average bitrate (as in Vegas), a reasonably accurate estimate is possible using the correct math (above).

If your encoder is using a Rate Factor metric (x264, x265), it is utterly and absolutely impossible to predict the final file size, because there is no scan pass, and scene complexity is NOT evenly distributed throughout an action movie, for instance.