¡Hola!

While rebuilding packages against python 3.15 we found that ttconv
produces some errors when used against it. The packages fails to build
from source [0].

Seems that the attribute _MISSING_TYPE from dataclasses is used and it
doesn't exists (at least) in python3.15. To fix it we should use
MISSING instead of _MISSING_TYPE.  I'm attaching a patch that fix this
issue.

[0] https://debusine.debian.net/debian/r-python-python3.15/artifact/4393731/

We believe that the bug you reported is fixed in the latest version of
ttconv, which is due to be installed in the Debian FTP archive.

A summary of the changes between this version and the previous one is
attached.

Thank you for reporting the bug, which will now be closed.  If you
have further comments please address them to 1145116@bugs.debian.org,
and the maintainer will reopen the bug report if appropriate.

Debian distribution maintenance software
pp.
Stuart Prescott <stuart@debian.org> (supplier of updated ttconv package)

(This message was generated automatically at their request; if you
believe that there is a problem with it please contact the archive
administrators by mailing ftpmaster@ftp-master.debian.org)
Format: 1.8
Date: Sat, 24 Oct 2026 17:03:18 +1100
Source: ttconv
Architecture: source
Version: 1.2.2-2
Distribution: unstable
Urgency: medium
Maintainer: Debian Python Team <team+python@tracker.debian.org>
Changed-By: Stuart Prescott <stuart@debian.org>
Closes: 1145116
Changes:
 ttconv (1.2.2-2) unstable; urgency=medium
 .
   * Team upload.
   * Cherry-pick patch for Python 3.15 compatibility with thanks to Emmanuel
     Arias (Closes: #1145116).
Checksums-Sha1:
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 7951bc858bf48d8654c0379902034629c8d15bba 6064 ttconv_1.2.2-2.debian.tar.xz
 83a7ef592cde05e7ee0cca9004384129c30f9047 8029 ttconv_1.2.2-2_source.buildinfo
Checksums-Sha256:
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 8cd4313b4c2075dc04d7c09421dea230411986a9604f9979dd19e76d8b277f14 6064 ttconv_1.2.2-2.debian.tar.xz
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Files:
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 5efd7dcd257d1e9d4e91af91cdceeba3 6064 python optional ttconv_1.2.2-2.debian.tar.xz
 0556208ea7018d594f6655c84d8464ed 8029 python optional ttconv_1.2.2-2_source.buildinfo
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