Extract Review and OIIO transcode failing to transcode media blocking publishes

[BigRoy]

Is there an existing issue for this?

• I have searched the existing issues

Current Behavior:

Over time we've had annoying reports where studios were unable to publish their renders because the publishing system (due to user configuration) tries to transcode e.g. a Z-depth AOV layer which may only have a named Z or Y channel and has no R, G, B or A channels and hence we don't really know what layer to process.

Instead of this we could also implement detecting more cases, so that if RGBA is not found in the file that maybe we allow to fall back to channels:

• XYZ
• Y
• Z (usually for z-depth?)

Here's metadata output for a file that fails without this PR:

<nchannels>1</nchannels>
<channelnames>
<channelname>Y</channelname>
</channelnames>
<alpha_channel>-1</alpha_channel>
<z_channel>-1</z_channel>
<deep>0</deep>

It's an Arnold Z-depth render AOV.

Expected Behavior:

Either:

• Allow the transcode to 'pass' through without an error but just a logged warning.
  OR
• Improve the channel detection to allow media to be much less unlikely to fail like this.

Version

1.0.0

What platform you are running on?

Windows

Steps To Reproduce:

1. Create a Maya Arnold render to EXR with separate AOV (not multilayer EXR) with a Z-depth AOV

Are there any labels you wish to add?

• I have added the relevant labels to the bug report.

Relevant log output:

No response

Additional context:

We do have settings to "filter out" certain AOVs because we've had this issue before on Extract Review. The setting is at ayon+settings://deadline/publish/ProcessSubmittedJobOnFarm/aov_filter however it does not apply to ExtractOIIOTranscode because transcode may occur on something that isn't necessarily a reviewable (I suppose?)