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Blu-ray bit rates
When rendering for a Blu-ray disk AVC using Vegas pro the offered templates that match your project are for 10mbps or 16mbps although you might be able to use some figure in between these figures.
I select the top option 16mbps & import the files into DVDA. Here I see that there is a slider that allows you to change the bit rate up to 40mbps.
Does this actually do anything at all to improve the quality of your output since it would seem that DVDA would then need to re-sample upwards?
I’ve always understood that re-sampling upwards was a no no since all it did was increase the file size while possible making the output worse. Is that not true?
Thanks in advance
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3 Replies
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[Paul Gregory] “I select the top option 16mbps & import the files into DVDA. Here I see that there is a slider that allows you to change the bit rate up to 40mbps. “
That slider is for the assets that DVD Architect creates like menus. It does not affect media that is already Blu-ray compliant.
[Paul Gregory] “Does this actually do anything at all to improve the quality of your output since it would seem that DVDA would then need to re-sample upwards? “
The answer is No even if the slider did affect the media. You can’t make something out of nothing. All you would be doing is using more bits to encode the same information with no improvement in quality.
[Paul Gregory] “I’ve always understood that re-sampling upwards was a no no since all it did was increase the file size while possible making the output worse. Is that not true?”
True because re-sampling is always lossy for MPEG2 and AVCHD, meaning it will be a little less accurate than the original information because of the way video is encoded.
~jr
http://www.johnrofrano.com
http://www.vasst.com -
I set a 2 hour AVCHD-recorded video on the Vegas 12 timeline to render at 21 mbps (the originally-recorded bitrate used in my camcorder) using the Sony AVC template for Blu-ray, and the resulting re-recordable Blu-ray disc contents look great! Was I wrong to up the rendering bitrate in Vegas, or did I follow proper procedures? I, too, am fairly new to HD and Blu-Ray recording.
Rich Kutnick
VIDEO IMPRESSIONS -
[Rich Kutnick] “Was I wrong to up the rendering bitrate in Vegas, or did I follow proper procedures? I, too, am fairly new to HD and Blu-Ray recording.”
If your original footage was AVCHD at 21 Mbps then I would definitely render at 21 Mbps to maintain the same quality.
~jr
http://www.johnrofrano.com
http://www.vasst.com
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