From: "Chris Zwar" <AE-List@media-motion.tv>
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Subject: Problems (bug) with EXR sequences
Message-Id: <B6C555A6-4206-4058-85D9-D2742FA1C35C@chriszwar.com>
Date: Tue, 14 Aug 2018 15:38:05 +1000
To: After Effects Mail List <AE-List@media-motion.tv>

Hi all,

I=E2=80=99m having some serious performance issues with EXRs and I =
thought I=E2=80=99d check to see if anyone else could help.

I=E2=80=99m working on a fairly big project, all renders are supplied as =
EXR sequences with lots of channels.  I=E2=80=99m working in 32bit =
float, linear.
I have downloaded the latest Open EXR plugins from the fnord website =
(Hey Brendan!  You there?) including Cryptomatte, which is a core tool.

After Effects will work with a single EXR file quite well.  Surprisingly =
well.  If I import an EXR it opens and displays as quickly as any other =
format.  If I use the ProEXR make comps feature (100% awesome) then it =
takes about 8 seconds to extract all the channels and display the =
contact sheet result.  Cryptomatte and Extractor work very quickly.  So =
basically - if I have a single exr frame in After Effects then all works =
fine.  Cryptomatte alone has the potential to be a complete game =
changer...

But as soon as I import an EXR sequence into AE then it all goes =
horribly wrong.  Using the Pro EXR make comps feature now takes several =
minutes.  Using Extractor to isolate a channel from the EXR now takes 30 =
- 60 seconds per frame.  In some cases AE can take 5 - 10 minutes to =
show an image.

And here=E2=80=99s the thing - this is for exactly the same exr file.  =
If I manually import just the first frame of a sequence (or any frame) =
then one frame is great.  As soon as I work with an exr sequence then =
everything becomes almost unworkable.

It=E2=80=99s probably cache related.  Yes I have the EXR cache enabled, =
but I have a suspicion that AE is wanting to cache every channel of the =
entire sequence before it displays a single frame.

I=E2=80=99m about to make a screen recording of this for Adobe, as this =
is a significant problem for me and the project I=E2=80=99m on now. =20

Any suggestions?


-Chris