From 4c92a2869b9a8f736a12ba859b74e5cadce62387 Mon Sep 17 00:00:00 2001
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From: Fabrice Fontaine <fontaine.fabrice@gmail.com>
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Date: Fri, 12 Nov 2021 09:50:17 +0100
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Subject: [PATCH] modules/videoio/src/cap_ffmpeg_impl.hpp: fix build with gcc
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4.8
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Fix the following build failure with gcc 4.8:
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In file included from /home/buildroot/autobuild/instance-3/output-1/build/opencv4-4.5.4/modules/videoio/src/cap_ffmpeg_impl.hpp:100:0,
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from /home/buildroot/autobuild/instance-3/output-1/build/opencv4-4.5.4/modules/videoio/src/cap_ffmpeg.cpp:50:
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/home/buildroot/autobuild/instance-3/output-1/build/opencv4-4.5.4/modules/videoio/src/cap_ffmpeg_hw.hpp: In constructor 'HWAccelIterator::HWAccelIterator(cv::VideoAccelerationType, bool, AVDictionary*)':
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/home/buildroot/autobuild/instance-3/output-1/build/opencv4-4.5.4/modules/videoio/src/cap_ffmpeg_hw.hpp:939:23: error: use of deleted function 'std::basic_istringstream<char>& std::basic_istringstream<char>::operator=(const std::basic_istringstream<char>&)'
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s_stream_ = std::istringstream(accel_list);
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^
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In file included from /home/buildroot/autobuild/instance-3/output-1/host/opt/ext-toolchain/arm-none-linux-gnueabi/include/c++/4.8.3/complex:45:0,
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from /home/buildroot/autobuild/instance-3/output-1/build/opencv4-4.5.4/modules/core/include/opencv2/core/cvstd.inl.hpp:47,
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from /home/buildroot/autobuild/instance-3/output-1/build/opencv4-4.5.4/modules/core/include/opencv2/core.hpp:3306,
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from /home/buildroot/autobuild/instance-3/output-1/build/opencv4-4.5.4/modules/videoio/include/opencv2/videoio.hpp:46,
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from /home/buildroot/autobuild/instance-3/output-1/build/opencv4-4.5.4/modules/videoio/src/precomp.hpp:57,
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from /home/buildroot/autobuild/instance-3/output-1/build/opencv4-4.5.4/modules/videoio/src/cap_ffmpeg.cpp:42:
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/home/buildroot/autobuild/instance-3/output-1/host/opt/ext-toolchain/arm-none-linux-gnueabi/include/c++/4.8.3/sstream:272:11: note: 'std::basic_istringstream<char>& std::basic_istringstream<char>::operator=(const std::basic_istringstream<char>&)' is implicitly deleted because the default definition would be ill-formed:
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class basic_istringstream : public basic_istream<_CharT, _Traits>
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^
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/home/buildroot/autobuild/instance-3/output-1/host/opt/ext-toolchain/arm-none-linux-gnueabi/include/c++/4.8.3/sstream:272:11: error: use of deleted function 'std::basic_istream<char>& std::basic_istream<char>::operator=(const std::basic_istream<char>&)'
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Fixes:
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- http://autobuild.buildroot.org/results/60f8846b435dafda0ced412d59ffe15bdff0810d
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Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
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[Retrieved from:
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https://github.com/opencv/opencv/commit/4c92a2869b9a8f736a12ba859b74e5cadce62387]
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---
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modules/videoio/src/cap_ffmpeg_impl.hpp | 6 ++++++
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1 file changed, 6 insertions(+)
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diff --git a/modules/videoio/src/cap_ffmpeg_impl.hpp b/modules/videoio/src/cap_ffmpeg_impl.hpp
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index d393b73ff4a2..76e1b855b7c8 100644
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--- a/modules/videoio/src/cap_ffmpeg_impl.hpp
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+++ b/modules/videoio/src/cap_ffmpeg_impl.hpp
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@@ -93,6 +93,12 @@ extern "C" {
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}
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#endif
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+// GCC 4.x compilation bug. Details: https://github.com/opencv/opencv/issues/20292
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+#if (defined(__GNUC__) && __GNUC__ < 5) && !defined(__clang__)
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+#undef USE_AV_HW_CODECS
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+#define USE_AV_HW_CODECS 0
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+#endif
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+
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//#define USE_AV_HW_CODECS 0
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#ifndef USE_AV_HW_CODECS
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#if LIBAVUTIL_VERSION_MAJOR >= 56 // FFMPEG 4.0+
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