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Motion blur from transcoded/rendered GH2 file
I’m using a Panasonic GH2, hacked with a variable bit rate (35mbps-100mbps). I recently rendered some footage from Vegas Pro 12, which displayed a lot of animated noise in the background.
This noise doesn’t appear when playing the mts file independently in a media player or while in the Vegas preview window. I read on a board that others also experienced this, including in files rendered from Adobe Premiere.
I learned the solution is to transcode the mts files and, as suggested, used a program called 5DtoRGB while transcoding the mts to Avid DNxHD codec. It took care of the noise/completely clean. It was also suggested to make transcoding part of the typical workflow, as to avoid this in the future.
I then noticed in some spots of the rendered file, there is bad motion blur. Although it is 24p footage and expect some blur, this extreme blur is definitely in the rendered footage from the DNxHD files and not in rendered footage from the original mts files.
Is there something I should be doing differently; for example use a different program to transcode to DNxHD? Also, I typically set the video switches in Vegas to “disable resample” – in this case, is this having an effect on the footage? Or is something else going on?
If familiar with 5DtoRGB, I have tried all the different combinations transcoding to DNxHD: ITU-R BT601/BT709 and/or Full Range, Broadcast Range luminance and get this blur with all.
Thanks for any input.
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3 Replies
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Hi Mark! You can also try rendering to DPX and see if the blur is still there. If not, then it’s happening during DNxHD encoding. If you want, you can send me a file and I can try it with the Mac version. There have been quite a lot of fixes to the Mac version since I released the Windows version, so this may not even be a problem on a Mac. I’m planning to update the Windows version to bring it in sync with the Mac version, but no ETA right now. 🙁
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Thomas, thanks for the reply. I don’t have permission to send the footage. I only shot it.
I did a search on the DPX codec and couldn’t find it. Do you know a download link? I’m also going to try the lighter ProRes settings/LT, etc. and see if the files aren’t too big, as regular ProRes is.
PC/Vegas Pro 12/Windows 7/64-bit.
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Thomas, I’ve been using the 64-bit version (on a 64 bit machine). I downloaded the 32 bit version of 5DtoRGB – I didn’t know it was DNxHD-specific, when just having the 64 version.
I was confused about your response regarding DPX thinking it was a codec to download – but understand it now to be “uncompressed” in the settings.
I’m doing some tests with the 32 bit version.
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