Your message dated Sat, 29 Mar 2025 19:10:32 +0000
with message-id <[email protected]>
and subject line Bug#972943: fixed in libtheora 1.2.0+dfsg-1
has caused the Debian Bug report #972943,
regarding libtheora0: Too easy to enable "telemetry" (statistics capture) by
mistake, causing poor performance
to be marked as done.
This means that you claim that the problem has been dealt with.
If this is not the case it is now your responsibility to reopen the
Bug report if necessary, and/or fix the problem forthwith.
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--
972943: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=972943
Debian Bug Tracking System
Contact [email protected] with problems
--- Begin Message ---
Package: libtheora0
Version: 1.1.1+dfsg.1-11
Severity: normal
Tags: patch fixed-upstream
Forwarded: https://gitlab.xiph.org/xiph/theora/-/issues/2312
The latest version of Proton (Valve's branch of Wine, used to run Windows
games under Steam) runs in a Debian 10-based container
(Steam Runtime 2 'soldier'), instead of the Ubuntu 12.04-based
LD_LIBRARY_PATH library bundle (Steam Runtime 1 'scout') that was used
in previous releases.
During the move from Steam Runtime 1 to 2, Proton developers noticed
a performance regression in their GStreamer-based video decoding,
which they were able to track down to the theoradec plugin. This plugin
uses libtheora, which has an optional feature called "telemetry" that
records statistics. It can be enabled or disabled at build-time; if
enabled at build-time, it is disabled by default at runtime. Activating
it at runtime involves setting some options, and incurs a significant
performance cost to convert each decoded frame from YUV to RGB for use
by Cairo (30-40ms per frame for 1920x1080 video).
Note that despite its name, as far as I'm aware "telemetry" does not
send the statistics anywhere, it just captures them - so it isn't a
privacy problem, and is really just "-metry", with no "tele-" involved :-)
In Debian, the telemetry feature is enabled in libtheora at build-time
since 1.1.1+dfsg.1-11, as requested in
<https://bugs.launchpad.net/ubuntu/+source/libtheora/+bug/627854>.
GStreamer's theoradec plugin attempts to set the telemetry options to
user-specified values. However, in released versions of libtheora,
setting the telemetry options to any value - even 0 - is documented to
have the side-effect of enabling the telemetry feature and triggering
the performance regression.
This can be fixed in three ways:
1. Disable telemetry at compile-time in libtheora.
We did this in the Steam Runtime as a temporary solution, but it's a
feature regression for libtheora, and the libtheora maintainers in
Debian presumably don't want that, so let's discard this option.
2. In GStreamer, if the telemetry options are set to 0, don't propagate
that into libtheora so that the expensive YUV -> RGB conversion is
not done, even with current releases of libtheora. This is
<https://gitlab.freedesktop.org/gstreamer/gst-plugins-base/-/merge_requests/887>
and I've filed a separate Debian bug for it. The patch has been merged
upstream and was backported to 1.18.x (for 1.18.1, I think) in
<https://gitlab.freedesktop.org/gstreamer/gst-plugins-base/-/merge_requests/892>.
3. In libtheora, if the telemetry options are all explicitly set to 0
(for example by current versions of GStreamer), behave as though they
had not been set at all, and therefore don't enable the expensive
YUV -> RGB conversion. This is
<https://gitlab.xiph.org/xiph/theora/-/issues/2312> and
<https://gitlab.xiph.org/xiph/theora/-/merge_requests/4>, and is what
this bug report represents. The patch has been merged upstream for
v1.2.0, but there hasn't been an upstream release since 1.2.0 alpha 1
(which doesn't have this change) in 2010, so it seems unlikely that
there will be a release with this change any time soon.
Following the principle that bad interactions between two components are
most robust if fixed on *both* sides, solutions 2 and 3 have both been
accepted upstream, and I suggest that they should also happen in Debian.
The Steam Runtime maintainers will probably be doing a backport of this
into 1.1.1, so I'll try to send a patch later.
Thanks,
smcv
--- End Message ---
--- Begin Message ---
Source: libtheora
Source-Version: 1.2.0+dfsg-1
Done: Petter Reinholdtsen <[email protected]>
We believe that the bug you reported is fixed in the latest version of
libtheora, 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 [email protected],
and the maintainer will reopen the bug report if appropriate.
Debian distribution maintenance software
pp.
Petter Reinholdtsen <[email protected]> (supplier of updated libtheora 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 [email protected])
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256
Format: 1.8
Date: Sat, 29 Mar 2025 10:15:44 +0100
Source: libtheora
Binary: libtheora-bin libtheora-bin-dbgsym libtheora-dev libtheora-doc
libtheora1 libtheora1-dbgsym libtheoradec2 libtheoradec2-dbgsym libtheoraenc2
libtheoraenc2-dbgsym
Architecture: source amd64 all
Version: 1.2.0+dfsg-1
Distribution: experimental
Urgency: medium
Maintainer: Debian Multimedia Maintainers <[email protected]>
Changed-By: Petter Reinholdtsen <[email protected]>
Description:
libtheora-bin - Theora Video Compression Codec (example encoder, decoder)
libtheora-dev - Theora Video Compression Codec (development files)
libtheora-doc - Theora Video Compression Codec (documentation)
libtheora1 - Theora Video Compression Codec (shared library - libtheora)
libtheoradec2 - Theora Video Compression Codec (shared library - libtheoradec)
libtheoraenc2 - Theora Video Compression Codec (shared library - libtheoraenc)
Closes: 516343 972943
Changes:
libtheora (1.2.0+dfsg-1) experimental; urgency=medium
.
* Team upload.
.
* New upstream version 1.2.0.
- SONAME change for libtheora0->libtheora1,
libtheoradec1->libtheoradec2 and libtheoraenc1->libtheoraenc2 due
to changes in constness for string arguments of some public
method arguments.
- README now i markdown format.
- Include encoding wrapper script (Closes: #516343).
- Fixes performance issue when enabling telemetry (Closes: #972943).
- Dropped 0002-player-example-needs-lm-for-rint.patch,
0003-latex.patch, 0004-libpng16.patch,
0005-drop-inter-library-dep.patch and 0006-CVE-2024-56431.patch
now included upstream.
* Dropped autopkgtest dependency valgrind on armel and riscv64.
* Updated Standards-Version from 4.7.0 to 4.7.2.
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