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Rendering HVX 720p footage results in grainy, pixelated video
Hello all. I’m having an issue exporting my HVX footage to mp4. I’m using Raylight to read the original HD-720p mxf files, and I’m trying to export to MainConcept mp4 at 50% of native resolution (640×360). This results in awful, grainy, pixelated video. However, if I render it at 100% native resolution (1280×720) it looks just fine. In fact, rendering at anything from 51% and up looks fine, but as soon as I cross that 50% threshold it turns to crap, and anything below that point has the same grainy, pixelated look.
screenshot_1280x720.jpg’>Here is a screenshot at full resolution (1280×720).
screenshot_640x360.jpg’>Here is a screenshot at 50% resolution (640×360).
I see this even while looking at the Video Preview within Vegas. This makes me think that it’s not an issue with the exporting process but something happening with the initial rendering of the mxf/HVX footage. In fact, when I change the video preview mode to “Preview (Half)” I get the same problem, where “Preview (Full)” looks just fine.
I’m also using HD footage from a Canon 60D and I’m having no such issues reading, rendering, or exporting that. It’s only the HVX stuff that’s giving me problems.
I’m using Vegas 10.0c on a MacBook Pro running Windows XP. My Project Properties are matched to the MVX footage, so there’s no discrepancy there.
So why would cutting the resolution in half make it looks so bad? And why the hard threshold at 50%? Anybody have a clue what I’m doing wrong? Any help would be appreciated.
Thanks!!
–=Bryan
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3 Replies
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Try setting your preview to Best (Full) before you render and make sure that the render template you use is picking up the Best project setting. The difference between Good and Best is that Best uses a more accurate resizing algorithm. Vegas Pro 10 has a new feature of rendering at the “project” quality setting which can messes with your renders if you have your quality set low to improve playback rate.
Also try using the Sony AVC encoder and see if that has the same issue. If that doesn’t work, render at 51%. 😉
~jr
http://www.johnrofrano.com
http://www.vasst.com -
Hi John, thanks for your response.
I tried all these tricks, and still no dice. I’m going to play around with settings for a while and see if I get a favorable response.
I have a suspicion that Raylight will end up being the culprit, as I’ve had performance issues with it before.
–=Bryan
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Bryan,
If you are having a problem with Raylight please contact DVFilm.
https://dvfilm.com/support.htm
We are happy to help.
Dave Keslick
DVFilm.com
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