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Blurring when rendering to DVD from HDV
Hello all,
I’m using Premiere Pro 2.0 and have recently started editing HDV footage. As I’m still rendering out to DVD Widescreen I’ve noticed that some of the footage seems to blur and jump, though, ever so slighlty e.g. leaves blowing about on a tree seem to be sharp then blur and jump for a second focus in again and etc etc. I’ve thought about the pixel aspect ratios for both HDV and DVD widescreen and wonder if this could be the problem as they’re both different or . . . any other ideas or suggestions?
The HDV footage is fine when I reveiwed it so see if the problem lay there.
Cheers
Ciro
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4 Replies
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You could be seeing keyframes which is when compression shows you a full frame, instead on one based only on changed pixels.
All DVDs have this issue, but it is usually very subtle.
What are your export settings and how long is the footage on the DVD?
Vince Becquiot
Kaptis Studios
San Francisco – Bay Area -
Hi Vince,
My export settings are 16:9 widescreen 25fps and vid clip of 5 minutes.
I’ve tried exporting the clips as targa files at the Anamorphic HD 1.33 pixel setting then used After Effects with the same pixel aspect ratio and rendered out to a Windows avi file. There isn’t any blurring so I suspect that trying to convert from HDV 1440:1080i 1.33 pixel aspect ratio to Widescreen 720:576 16:9 1.422 aspect ratio is mucking it up somewhere?
If I’m seeing keyframes when compression shows a full frame, instead on one based only on changed pixels what would I need to do to resolve the issue?
many thanks
Ciro
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Hi Ciro,
You can rule out the pixel aspect ratio issue by exporting in square pixels at 1024×576.
But if the blurring isn’t constant, the issue is either with the frame rate or keyframes.
For the DVD encoding, set your compression to 7.5 Mb/s CBR
What are you using to encode to DVD, do you have control over GOP settings?
Vince Becquiot
Kaptis Studios
San Francisco – Bay Area -
Hi Vince,
Thanks again for the update. I’ve managed to resolve the problem.
I was working in a Premiere HDV project with the HDV footage and then rendering down to DVD using the media encoder, which, in my mind was messing the end result up.
I opened a DV-PAL widescreen project and imported the original uncut HDV footage. Resized the footage to 54% to fill the screen and hey presto, no blurring on test renders I’ve done.
I’ve now copied the time line footage of my HDV project and pasted it into a new DV-PAL widescreen project. Of course, it means resizing all the clips and putting in the dissolves in again but a lot less work than having to start all over.
I will still look at some of the ideas you put forward as it’s always good to have other fallbacks.
many thanks and hope this helps anyone else who may have the same problem.
regards
Ciro
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