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Question DVDA rendering Video

  • BobH
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DVDA rendering Video was created by BobH

Posted 16 Apr 2023 23:58 #1
Hi there,
I have a project in VEGAS Pro 18 that I wish to render to burn a BluRay disc.
I selected the MAGIX AVC/AAC MP4 Format and then the template Blu-ray 1920x1080-50i, 25 Mbps video stream.
I am burning it to a 50GB dual layer disc.
During the Prepare it then re-renders all the video which takes a very long time.
If I have selected the Blu-ray template, why is it re-rendering the file?
All suggestions welcome.

I don't believe I have had this problem when in the past I have used the Sony AVC/MVC Format and then the template Blu-ray 1920x1080-50i, 16Mbps video stream, even if I increase the bit rate.

Thanks
BobH
Last Edit:20 Apr 2023 14:52 by BobH

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Replied by Robbie on topic DVDA rendering Video

Posted 19 Apr 2023 23:41 #2
Hi Bob
Hopefully Derek will be back with us soon and will be able o offer more suggestions, but I had always understood that DVDA has a preference for no more than 20MBPS with AVC Video and will reencode media that is 20MBPS or more.  Bluray spec has higher limits for pre4ssed discs but burned dciscs are less forgiving. Out of curioswity, low long is the video you are wanting to burn?
Cheersw, Robbie
Last Edit:19 Apr 2023 23:43 by Robbie

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Replied by DoctorZen on topic DVDA rendering Video

Posted 20 Apr 2023 14:58 #3
I am still recovering from surgery, after ending up back in hospital twice now.
I am very hesitant to promise anyone, anything, until I am firmly out of the woods.
That all being said, I would also like to know what is the total length in time of your project Bob ?

Also, what is the Frame Rate of the project in VEGAS Pro ?
Do you have the Frame Rate in DVD Architect (project properties) set to the be same as in VEGAS Pro ?
A mismatch in Frame Rate settings, is a common mistake and can cause re-rendering to occur.
 
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  • BobH
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Replied by BobH on topic DVDA rendering Video

Posted 21 Apr 2023 00:47 #4
Hi again, so a few more details.

My video is 4K mp4 at 25 fps from a Panasonic video camera.. In VEGAS 18 the field order is set to Progressive, frame rate 25.000 (Pal). I have two files in DVDA, one is 2 hours 24 minutes (25.2 GB), the other is 1 hour 11 minutes (12.4 GB).
DVDA is set as follows:
Blu-ray Disc, Target media 50.00, Aspect Ratio 16:9. Video Format is AVC with Bit Rate 25.000. Resolution is 1920x1080 with Frame Rate 25.000 interlaced. Total size is 43.3 GB.

I hope this helps.
Thanks again
BobH
by BobH

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Replied by DoctorZen on topic DVDA rendering Video

Posted 21 Apr 2023 16:18 #5
I haven't used DVDA for a long time now, so my knowledge is not as sharp as it used to be.
You can't rely on the File Size of your videos to be what guides whether your project will fit on a 50GB blu-ray and not require re-rendering.
It's all about Total Length in Time.
You have 3 hour and 35 minutes (215 minutes) in total, which is quite long, even for a 50GB Blu-ray disc.
What all this means, is that BOTH of your videos must use a Bit Rate, that does create a total file size that exceeds 50GBs (it's actually less than 50GBs in reality.

When I was making Blu-ray discs, I always used this online Bit Rate calculator, which will tell you what settings to use in VEGAS Pro.
dvd-hq.info/bitrate_calculator.php
I have taken a screen shot of the settings that match the info you have provided.
Please note that this is using the exact total time you gave me.
In reality, it is safer to use a Safety Margin as well, to make sure you stay in the Bit Rate budget.
In a 215 minute total time project, it would probably be best to use at least an extra 3% to 5% to allow for variables.
Example: 215 x 1.03% = 222 minutes
215 x 1.05% = 226 minutes

*Please note, if you enter 222 or 226 as the time, you will have to generate new bit rates!

 

Inside of VEGAS Pro, the Bit Rate calculator is expecting you will be rendering with MainConcept MPEG-2 for Blu-ray.
**Remember, VEGAS Pro uses an extra 000 for bit rates. 37300 becomes 37,300,000 etc...
I didn't muck around with I-frames and left at Vegas defaults.


Render both videos first and then check total file size.
Also, remember to render separate Audio Streams - that file size also goes into the total pot!

 

 





 
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Replied by BobH on topic DVDA rendering Video

Posted 21 Apr 2023 19:33 #6
Hello Derek and thank you for all your time with this. I will have a look at it and I am sure it will help.

I hope all goes well with you and that you feel much better soon.

Very best wishes
BobH
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