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Region Workflow Problem
I have eighty events that I have set to regions for batch render. The render template is a modified Sony AVC (without sound.) I have noticed before and it continues in Vegas 12 that these region renders are always one frame too short. When I import the batches back over the edited audio they obviously (after eighty events) get progressively out of sync.
My solution to this came by finding a Grouping script that makes a group out of the track above it (which I needed to do anyway)… which to my great delight also aligned them. I do, however, hope to find a way to render regions without the frame loss or nudge each region end by one collectively to fix the render problem. Has anyone else had this problem?
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5 Replies
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[Matt Carlson] “I have noticed before and it continues in Vegas 12 that these region renders are always one frame too short.”
Are you sure that the regions fall on frame boundaries? Check to make sure that Options | Quantize to Frames is enabled so that you’re not creating regions in the middle of frames.
~jr
http://www.johnrofrano.com
http://www.vasst.com -
Quantize to Frames is enabled. Rendering the regions with a Quicktime template creates clips of the proper size but the clips are being sent to several different applications (AE, Resolve, etc) and AVC was the best choice to play well with all of them on a windows machine (and I noticed a drop in quality with fast movement from Quicktime at the same bitrate.) The footage is 23.976 progressive so I tried a render at straight 24 and the clips ran over. It just seems to be a quirk with Sony AVC although I vaguely remember having a similar problem with ASF many years ago.
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That’s odd that only Sony AVC comes up short. Sorry I have no idea why that would happen. Try MainConcept AVC and see if that has the same problem.
~jr
http://www.johnrofrano.com
http://www.vasst.com -
Main Concept also has the same problem. I ran several tests and here are the interesting results.
Quicktime duration of a 25.00 region Media Info 24s 982ms Vegas Properties 25.00
Sony AVC duration of same region Media Info 24s 960ms Vegas Properties 24.23 (missing frame)Sony AVC duration with Quantize OFF Media Info 24s 983ms Vegas Properties 24.23
The durations become almost the same in Media Info but the frame is still missing in Vegas.Sony AVC with Adjust To Frame Rate checked Media Info Frame Rate 11.988 Duration 25s 25ms (one frame over and frame rate messed up.)
There is definitely something going on with the source which is a lecture burned to Bluray (through DVD architect I believe but I should check) but the source stats seem fine: AVC High 4.1 Reference Frames 3 progressive. The source is demuxed with TSMuxer and the audio is converted to M4a for editing. The renders come back Reference Frames 2 for AVC but that is the only inconsistency I can find. I can’t find a reason for the Adjust To Frame Rate to think the source is 11 since Quicktime comes back fine.
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In a project where I modified original batch render script for a round-trip via DaVinci Resolve I came to the same problem. What I found is that last frame from previous clip is used and with the correct clip length the last frame of the rendered clip is missing.
Maybe download .zip-file and try it. You will find it here:
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