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avid DNxHD LE1.9
I am rending some animations on a computer with the latest mac OS and the avid LE1.9 codec pack. The animations are 1080i DNxHD.
I am getting color block banding at the end of all of the rendered quicktimes.
I have a friend with the same set up who has also been getting these anomalies, though his have been peppered throughout the animation and not all at the end.I’ve brought the rendered files back to my other computer, a G5 OSX 10.4.11. When I playback the quicktimes, the anomalies do not show up.
Anyone else had any issues with this?
I was surprised not to find posts about it. If my friend is having the same problem, I figured others out there were too. -
6 Replies
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any lossy codec will usually start to show banding in subtle gradations of color. to help reduce how noticeable the banding is you can often add a little noise on an adjustment layer at the top of the comp prior to rendering.
dnxhd is capable of 10-bit color… if you are rendering as 10-bit, you might work in 16 bpc (16 bit-per-channel) comps in ae. this too can reduce banding. renders will generally take longer, and not all effects will render 16 bpc (they’ll render but they’ll limit the calculations to 8 bpc)… any of the standard ‘cc’ effects, for example are only 8 bpc.
as far as looking different on another system, it may be that the other display is not quite as good and you’re not seeing the banding over there.
Kevin Camp
Senior Designer
KCPQ, KMYQ & KRCW -
Thanks, Kevin.
I guess “color banding” was not a good description though.
I know what you are referring to with the banding with gradation of colors.But, these anomalies are huge colored squares that show up in a horizontal line.
Multiple lines at once that all travel up and down the screen.Again, these are BIG lines, definitely not to be confused with ‘field’ type of lines.
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yep, that definately sounds like a problem…
if the newer system that you are seeing the problems on is a macpro, you can test to see if this is an intel-dnxhd codec problem by running the powerpc version quicktime…
in the applications folder, select quicktime, then choose file>get info… check the option for ‘open using rosetta’ (you may need to ‘unlock’ the settings by clicking the lock at the bottom of the get info window).
then try opening your dnxhd mov in quicktime and see if the problems are still there….
whether they are or aren’t may not help too much, but it will help if you can send that info to avid.
things you might try…
remove the avid codecs, then reinstall them in safe mode (shutdown for 10 seconds, hit the power, then hold shift while booting).
after reinstalling, move the ae prefs folder to the desktop (users/username/library/preferences/adobe/after effects, it’s the folder with the ae version number).
do a ‘repair permissions’ with the disk utility (applications/utilities)
Kevin Camp
Senior Designer
KCPQ, KMYQ & KRCW -
Sounds like a DECoder problem. Probably your disk isn’t fast enough for the decoding algorithm to keep up with playing at the desired framerate of the movie.
I wouldn’t worry too much about it but instead look into finding a way to load the rendered movie into RAM and playing it back from there.
You may want to search for a playback application that will do that for you or simply use AE”s RAM Preview.
HTH
RoRKbroadcastGEMs – AEPro Volume 02 (Professional Adobe After Effects Project Files – Now Available)
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Hi All,
so I’ve been rendering some DNxHD movies (at the request of an editor) and, for the most part, had no problems.
It’s only with very complicated animations that this codec seems to break down. (see attached picture)
It happens upon repeated efforts to rerender.
As far as I can tell, this is not a Quicktime preview problem, nor is it a RAM buffer problem.
I am using the latest codecs from Avid on an Intel/MacPro machine running Leopard/AE CS4, but I have also had this problem using a powerPC mac too.
Any Windows users ever see this before?
My advice is to NOT use this codec when trying to render lengthy, complicated HD animations. Maybe the good folks at Avid will fix this someday, but for now I have to resort to the good ‘ol animation codec for import into an AVID DS. (otherwise I might use the Apple ProRes codec)thanks for all your help, CowGurus!
bruce w.
Reality is just a collective hunch.
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Bruce, I really can’t believe you and I are the ONLY ones who have had this issue. Just doesn’t seem possible.
And what is your definition of “complex” animations? Sounds unsafe to use it period…..especially since I was seeing mine on that newer system, but the anomalies didn’t show up when I played it back on my older, home computer. Does it exist or not? I’d have to think it was a quicktime issue with that codec….but you are saying you think not?
Any luck getting an HD avid suite editor to check them out for you?
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