c2patool works, Python bindings raise exception

[DiTo97]

I have been playing with the library on some OpenAI-generated images, such as:

As the title says, I am able to read the C2PA manifest from the CLI, but not from the Python bindings.

I have run the following command:

c2patool /path/to/image.png

which works fine and returns the manifest as a JSON string.

Then, I have run:

import c2pa


try:
    reader = c2pa.Reader.from_file("path/to/image.png")
    print("manifest store:", reader.json())
    manifest = reader.get_active_manifest()
except Exception as e:
    print(e)

which throws an error with message reason='claim could not be converted from CBOR'.

[crandmck]

Yes, this is a known limitation of the current Python library release. The Rust library (what OpenAPI uses) can write V2 claims, but the Python library can't currently read them.

We are actively working on updating c2pa-python, and we expect be able to release it soon.

cf. #80 and same question in Discord

[DiTo97]

@crandmck, gotcha.

1. What's the suggested approach short-term? I'm wondering if I should wait until the Python library is up to speed, or subprocess the Rust binaries
2. What's missing to complete V2 Claims in Python SDK #80? I might help you complete the transition to reading v2 claims if it still needs work; is there a plan for it in the Discord server?

[ilic5000]

Yes, this is a known limitation of the current Python library release. The Rust library (what OpenAPI uses) can write V2 claims, but the Python library can't currently read them.

We are actively working on updating c2pa-python, and we expect be able to release it soon.

cf. #80 and same question in Discord

Any news on this fix?

[DiTo97]

@ilic5000, I have been calling the Rust binary from Python with good success, as the SDK isn't fixed yet.

I'll share the relevant snippet for that,
https://github.com/DiTo97/GPTZero-V/blob/10bc13c93a1f55a71281bfe8c076a613a2afa612/src/authenticity/c2pa_handler.py

[tmathern]

We've released v0.10.0 which should fix the issue, as long as you're on an architecture that is natively supported.

https://github.com/contentauth/c2pa-python/releases/tag/v0.10.0 | https://pypi.org/project/c2pa-python/0.10.0/
(I verified the builds with a small example from here).

[DiTo97]

We've released v0.10.0 which should fix the issue, as long as you're on an architecture that is natively supported.

https://github.com/contentauth/c2pa-python/releases/tag/v0.10.0 | https://pypi.org/project/c2pa-python/0.10.0/ (I verified the builds with a small example from here).

@tmathern, I will test it and report back.

Where's the list of supported architectures?