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Sheer Video Whites clipping?
I’ve been using the Sheer video codecs to back and forth between AE 6.5 and FCP 6. I use QT Pro to convert my ProRes HQ footage to Sheer video’s RGB Codec. I retime my clip in AE, then render back out to ProRes from AE. I’ve tried a few other workflows as well:
*rendering to Sheer video YUV from AE, then using QT Pro to conver Sheer YUV to ProRes
*importing into FCP the sheer video RGB and YUV clips rendered in AE, then converting to ProRes using QT conversion inside FCP (This DID NOT work; massive color shift)In all of these cases, when I get the clip inside Final Cut and look at it on the waveform scope, I see that the whites, which were slightly clipped at 110 IRE in the original 59.94i clip, are now slightly clipped at 100 IRE in any of the converted clips. This is true for the clips I converted back to ProRes and for the clips I rendered out of AE as Sheer video RGB or YUV.
All I did to the clips in AE, aside from the codec conversions, is retime them from 5994i to 24p to achieve a slo mo effect.
Anyone know the reason for this white point shift?
Thanks!
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3 Replies
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How are you setting the “Input range” when converting to Sheer RGB?
RafaelPPC G5 2x2Gh 4GbRAM/BlackMagic SD/PMBP 17″Core2Duo 4GbRAM
JVC DTV-17″/FCS2/AE CS3/COMBUSTION/SHAKE -
I tried it both ways: 0 to 1023 and 64 to 940. Same result.
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Hi,
Sorry I couldn’t come back earlier.
I think that your only problem is that you are using QT conversion. QT clips all the non legal video levels.
You should avoid to use it to process any pictures unless the loose of quality is not an issue.
I mean, is very good to make a small movie to send by e-mail to your customers, but don’t use it to process your master. With QT you have not control at all of what is going on.
Try the format conversion in FC or Compressor and you won’t have problems with the clipping.
rafaelPPC G5 2x2Gh 4GbRAM/BlackMagic SD/PMBP 17″Core2Duo 4GbRAM
JVC DTV-17″/FCS2/AE CS3/COMBUSTION/SHAKE
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