1From 4c92a2869b9a8f736a12ba859b74e5cadce62387 Mon Sep 17 00:00:00 2001
2From: Fabrice Fontaine <fontaine.fabrice@gmail.com>
3Date: Fri, 12 Nov 2021 09:50:17 +0100
4Subject: [PATCH] modules/videoio/src/cap_ffmpeg_impl.hpp: fix build with gcc
5 4.8
6
7Fix the following build failure with gcc 4.8:
8
9In file included from /home/buildroot/autobuild/instance-3/output-1/build/opencv4-4.5.4/modules/videoio/src/cap_ffmpeg_impl.hpp:100:0,
10                 from /home/buildroot/autobuild/instance-3/output-1/build/opencv4-4.5.4/modules/videoio/src/cap_ffmpeg.cpp:50:
11/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*)':
12/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>&)'
13             s_stream_ = std::istringstream(accel_list);
14                       ^
15In 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,
16                 from /home/buildroot/autobuild/instance-3/output-1/build/opencv4-4.5.4/modules/core/include/opencv2/core/cvstd.inl.hpp:47,
17                 from /home/buildroot/autobuild/instance-3/output-1/build/opencv4-4.5.4/modules/core/include/opencv2/core.hpp:3306,
18                 from /home/buildroot/autobuild/instance-3/output-1/build/opencv4-4.5.4/modules/videoio/include/opencv2/videoio.hpp:46,
19                 from /home/buildroot/autobuild/instance-3/output-1/build/opencv4-4.5.4/modules/videoio/src/precomp.hpp:57,
20                 from /home/buildroot/autobuild/instance-3/output-1/build/opencv4-4.5.4/modules/videoio/src/cap_ffmpeg.cpp:42:
21/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:
22     class basic_istringstream : public basic_istream<_CharT, _Traits>
23           ^
24/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>&)'
25
26Fixes:
27 - http://autobuild.buildroot.org/results/60f8846b435dafda0ced412d59ffe15bdff0810d
28
29Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
30[Retrieved from:
31https://github.com/opencv/opencv/commit/4c92a2869b9a8f736a12ba859b74e5cadce62387]
32---
33 modules/videoio/src/cap_ffmpeg_impl.hpp | 6 ++++++
34 1 file changed, 6 insertions(+)
35
36diff --git a/modules/videoio/src/cap_ffmpeg_impl.hpp b/modules/videoio/src/cap_ffmpeg_impl.hpp
37index d393b73ff4a2..76e1b855b7c8 100644
38--- a/modules/videoio/src/cap_ffmpeg_impl.hpp
39+++ b/modules/videoio/src/cap_ffmpeg_impl.hpp
40@@ -93,6 +93,12 @@ extern "C" {
41 }
42 #endif
43
44+// GCC 4.x compilation bug. Details: https://github.com/opencv/opencv/issues/20292
45+#if (defined(__GNUC__) && __GNUC__ < 5) && !defined(__clang__)
46+#undef USE_AV_HW_CODECS
47+#define USE_AV_HW_CODECS 0
48+#endif
49+
50 //#define USE_AV_HW_CODECS 0
51 #ifndef USE_AV_HW_CODECS
52 #if LIBAVUTIL_VERSION_MAJOR >= 56 // FFMPEG 4.0+
53