Fix logging in MovieFFmpeg with multiple threads #1045
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Signed-off-by: Cédrik Fuoco <cedrik.fuoco@autodesk.com>
cedrik-fuoco-adsk
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bernie-laberge and
eloisebrosseau
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eloisebrosseau
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Jan 5, 2026
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@bernie-laberge Could you review this? It does not require any testing. |
Signed-off-by: Cédrik Fuoco <cedrik.fuoco@autodesk.com>
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@bernie-laberge Do you mind re-approving this PR? You had previously approved it, but I had to recreate it. |
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Fix logging in MovieFFmpeg with multiple threads
Linked issues
n/a
Summarize your change.
The mechanism used to prevent duplicate log messages in MovieFFmpeg.cpp did not work correctly in a multithreaded context.
This PR refactors the code to use
std::once_flagandstd::call_once, which is more robust.Describe the reason for the change.
This issue was discovered while testing another fix. When opening RV from the command line and passing a media file as a parameter, the same log messages were printed multiple times and became intertwined.
Example:
WARNING: FFmpeg detected pixel format AV_PIX_FMT_NONE for frames in WARNING: FFmpeg detected pixel format AV_PIX_FMT_NONE for frames in media.avi. Using fallback pixel format: WARNING: FFmpeg detected pixel format AV_PIX_FMT_NONE for frames inAfter the fix:
WARNING: FFmpeg detected pixel format AV_PIX_FMT_NONE for frames in media.avi. Using fallback pixel format: bgr24Describe what you have tested and on which operating system.
Rocky Linux 9.6
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