duration misplaced on generated manifest

[cubap]

The downloaded Manifest based on my audio file (that is, the project was started on an audio file) appears to assign a duration on the audio annotation, but not to the Canvas itself.

The current 3.0 API insists:

A Canvas MUST have a rectangular aspect ratio (described with the height and width properties) and/or a duration to provide an extent in time.

There is, of course, no height or width attached to the Canvas, so a user has to add it themselves to be in compliance. I have not generated a branch for this or committed to a pull request to fix it at this time.

Additionally, though not correctly placed in its own issue, the target in the audio annotation was only identified as "canvas/c" instead of the complete "c1".

[stephenwf]

Hi @cubap, thanks for the bug report!

Yes, I think there may also be a few more deviations from the 3.0 specification since it progressed from Alpha to Beta a few months ago. I will try to take a look at this soon, see if we can get the output manifests fully in spec.

I did try taking a manifest and putting it into the Universal viewer, which did show the ranges, but did not show the audio, and it sounds like the issues that you found here could be the cause!

[cubap]

That's exactly right. Thanks for the attention and the work you've done!
If you want to point me at a component, I can generate a pull request this coming week, most likely.
As an aside, I'm not seeing the same thing at universalviewer.io. Is the P3 support something that isn't in the demo yet?

[stephenwf]

The British Library are currently doing some work on the Universal Viewer to get good support for Audio + IIIF Presentation 3 into the UV. Here's a link to the staging site with one of the test manifests. If you scrub along the timeline you can see the annotations appearing below, and if you jump into full screen you'll see the ranges on the right hand side showing up (same as above).

I think the BL plan to get all of that work pushed back upstream into the UV, though the current UV should have some support for A/V.