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Weird color problem after encoding
I posted this in Compression Techniques, but since it’s coming from AE, somebody here might be able to shed some light.
I’m encoding some material exported from After Effects. It’s mostly HVX200 footage, shot at 24PN, mixed with some very simple graphics. It’s basically a talking head/lower third deal.
I’ve been using Episode Pro and Compression Master before that for a couple years now and have never seen this problem. I’m encoding to H264 and I’ve tried several different formats set up for streaming (mp4,mov, etc) with the same results. The color is shifting in a weird way, almost like the green channel is being offset about 20 pixels down.
I’ve probably encoded a few hundred videos and I’ve never seen this happen with any format. The only thing different about this material is that I used 16 bit color mode in AE for the first time, so I’m thinkin it could have something to do with that…Anybody know what’s going on? I think I’ve read about this in other situations (not encoding) and I think there is a name for it, but I can’t remember it. Any Help would be greatly appreciated.
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6 Replies
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Is this issue apparent in the AE render, or only in the encoded file?
Darby Edelen
Designer
Left Coast Digital
Santa Cruz, CA -
I realized I should have clarified that the AE render wwas fine, but being my first post, it was lost in Approval land…
this is the original AE render:
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What output module/render settings did you use from AE?
It looks to me like there isn’t an RGB channel shifting, it looks more like one of the chroma channels of Y’CbCr. Are you using any Y’CbCr codecs at any point in the process post-AE?
Darby Edelen
Designer
Left Coast Digital
Santa Cruz, CA -
this is the process from shoot to encode:
HVX200, DVCPRO HD 720P60, 24PN> P2 (MXF) >
Final Cut Import (quicktime wrapper, DVCPRO HD 720P60) >
Automatic Duck export to AE >
AE render (quicktime, animation) >
Episode Pro encode: H264 mov, H264 mp4I should also mention this is my first time using Automatic Duck. For those not familiar, you export an XML file from final Cut, import that into AE and it brings in all the native media from your FCP timeline.
And to clarify, I changed the AE project back to 8bit, rendered that, and the encoding results are the same..
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After posting here, I discovered there is a forum for Episode Pro, and Craig Seeman is helping me there. It seems to be an issue with cropping the footage in EP. Thanks for your time Darby.
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No problem… My next suggestion was going to be using Compressor’s default encoders to see if they have better luck =)
Darby Edelen
Designer
Left Coast Digital
Santa Cruz, CA
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