-
Alternating colour shift on converting EOS7D H.264 to ProRes HQ
Another gripe with the 7D.
When converting footage from H.264 to ProRes HQ (FCS2 system, conversion done via Compressor) we’ve noticed that some clips have an alternating shift in colour.
What I mean is that on playback the clip starts off ok, then suddenly shifts colour slightly, and after a while shifts back again, and then the cycle is repeated.
We also desaturated the footage with FCP6 and the shift then manifested itself as a slight difference in brightness.
When filming, camera was on Manual with a set White Balance.
Any clues on how to fix this issue?
Thanks all.
k -
3 Replies
-
does the original footage exhibit this shift? Where you shooting 720p60? I’ve never seen it on my cameras but the other day I was helping a client who had shot probably about 50min of 720p60 on the 7D all with in a little of an hour and the camera got the temperature warning several times. Lo and behold the footage had the shift you were are talking about.
Robbie Carman
—————-
Colorist and Author
Check out my new Books:
Video Made on a Mac
Apple Pro Training Series DVDSP
From Still To Motion -
Do you, or anyone else, know the time limit (generally, I know there’s several factors that can contribute) before you start seeing heat issues? Anyone have a way to reduce heat quickly without damaging vital electronics?
Jonathan Ziegler
https://www.electrictiger.com/
520-360-8293 -
Hi All
thank you so much for your contributions.
In answer to the various questions.
The camera did not overheat — the shots were taken as the camera was switched on.
The original footage did not exhibit the shift.
The footage was filmed at 1080p 25fps.
We ran a test, selecting the “Enable 4:4:4 Chroma Filtering” option when encoding to ProRes(HQ) and it looks like it may have cured the issue…
Reply to this Discussion! Login or Sign Up