Showing stream video
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@BrMisha You could write your own QIODevice and use it with https://doc.qt.io/qt-5/qmediaplayer.html#setMedia
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Hi,
What OS are you on ?
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In that case, I would rather consider using VLC and its Qt integration to handle the video stream.
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In that case, I would rather consider using VLC and its Qt integration to handle the video stream.
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Because VLC is the Swiss Army Knife of vidéo decoding and supports a larger palette of codecs than most OSs provide out of the box.
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Because VLC is the Swiss Army Knife of vidéo decoding and supports a larger palette of codecs than most OSs provide out of the box.
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It does not mean it does not work anymore. I'd say it's worth a try.
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Unfortunately, VLC doesn't provide prebuilt packages for my compiler (MinGW32-64 7.3.0).
After googling i decided to try ffmpeg. I build it following this manual https://ffmpeg.org/platform.html#Native-Windows-compilation-using-MinGW-or-MinGW_002dw64 , then add libs to *pro file:LIBS += -LF:/FFmpeg/tempinstall/usr/local/lib/ -llibavcodec.dll -llibavformat.dll INCLUDEPATH += F:/FFmpeg/tempinstall/usr/local/include DEPENDPATH += F:/FFmpeg/tempinstall/usr/local/includeand i called avformat_open_input(some args). But got error^
c:/qt/qt5.14.1/tools/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/8.3.0/../../../../x86_64-w64-mingw32/bin/ld.exe: main.o: in function `qMain(int, char**)': D:\projects_test\qt\PlayerVideo\build-PlayerVideo-Desktop-Debug/../PlayerVideo/main.cpp:58: undefined reference to `avformat_open_input(AVFormatContext**, char const*, AVInputFormat*, AVDictionary**)'So, i'm searching my mistake... I compared compiler versions between msys2 and qt, booth have GNU Make 4.2.1, but msys2 has gcc 8.3.0 and qt has 7.3.0.
That is problem? -
It's "-lavcodec"
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Did you fix all libraries name ?
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@SGaist this part of .pro
LIBS += -LF:/Musor/FFmpeg_linbuild/ffmpeg/lib/ -lavformat INCLUDEPATH += F:/Musor/FFmpeg_linbuild/ffmpeg/include DEPENDPATH += F:/Musor/FFmpeg_linbuild/ffmpeg/includeIn code i'm calling only avformat_license(), which locates in avformat
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Do you have ffmpeg built for the same architecture as your Qt version ?
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Men, I really don't understand what is happening.
I installed msys2, and some packages for that, then i copied *c:\Qt\Qt5.14.2\Tools\mingw730_64* to *c:\msys64\mingw64*.
Then built libav (it is "small" version of FFmpeg) and got this files:build\usr\local\bin\avcodec.lib build\usr\local\bin\avcodec-58.dll build\usr\local\bin\avconv.exe build\usr\local\bin\avdevice.lib build\usr\local\bin\avdevice-57.dll build\usr\local\bin\avfilter.lib build\usr\local\bin\avfilter-7.dll build\usr\local\bin\avformat.lib build\usr\local\bin\avformat-58.dll build\usr\local\bin\avprobe.exe build\usr\local\bin\avresample.lib build\usr\local\bin\avresample-4.dll build\usr\local\bin\avutil.lib build\usr\local\bin\avutil-56.dll build\usr\local\bin\swscale.lib build\usr\local\bin\swscale-5.dll build\usr\local\include\libavcodec\ << here is *.h build\usr\local\include\libavdevice\ << here is *.h build\usr\local\include\libavfilter\ << here is *.h build\usr\local\include\libavformat\ << here is *.h build\usr\local\include\libavresample\ << here is *.h build\usr\local\include\libavutil\ << here is *.h build\usr\local\include\libswscale\ << here is *.h build\usr\local\lib\pkgconfig\ build\usr\local\lib\avcodec-58.def build\usr\local\lib\avdevice-57.def build\usr\local\lib\avfilter-7.def build\usr\local\lib\avformat-58.def build\usr\local\lib\avresample-4.def build\usr\local\lib\avutil-56.def build\usr\local\lib\libavcodec.dll.a build\usr\local\lib\libavdevice.dll.a build\usr\local\lib\libavfilter.dll.a build\usr\local\lib\libavformat.dll.a build\usr\local\lib\libavresample.dll.a build\usr\local\lib\libavutil.dll.a build\usr\local\lib\libswscale.dll.a build\usr\local\lib\swscale-5.def*c:\Qt\Qt5.14.2\Tools\mingw730_64* was added to PATH. When I start, for example, avconv.exe, it works ok, so definitely libav was built with true mingw (which uses qt).
Next, i added to *.pro (using "Add library...") this:win32: LIBS += -LF:/Musor/libav/build/usr/local/lib/ -llibavformat.dll INCLUDEPATH += F:/Musor/libav/build/usr/local/include DEPENDPATH += F:/Musor/libav/build/usr/local/includemain.c:
#include <libavformat/avformat.h> int main(int argc, char *argv[]) { avformat_license(); return 0; }After compilation i got:
C:/Qt/Qt5.14.2/Tools/mingw730_64/bin/mingw32-make -f Makefile.Debug mingw32-make[1]: Entering directory 'D:/projects_test/qt/qt_test/build-qt_test-Desktop_Qt_5_14_2_MinGW_64_bit-Debug' g++ -c -fno-keep-inline-dllexport -g -std=gnu++11 -Wall -Wextra -Wextra -fexceptions -mthreads -DUNICODE -D_UNICODE -DWIN32 -DMINGW_HAS_SECURE_API=1 -DQT_DEPRECATED_WARNINGS -DQT_QML_DEBUG -DQT_SERIALPORT_LIB -DQT_CORE_LIB -I..\qt_test -I. -IF:\Musor\libav\build\usr\local\include -IC:\Qt\Qt5.14.2\5.14.2\mingw73_64\include -IC:\Qt\Qt5.14.2\5.14.2\mingw73_64\include\QtSerialPort -IC:\Qt\Qt5.14.2\5.14.2\mingw73_64\include\QtCore -Idebug -IC:\Qt\Qt5.14.2\5.14.2\mingw73_64\mkspecs\win32-g++ -o debug\main.o ..\qt_test\main.cpp ..\qt_test\main.cpp: In function 'int main(int, char**)': ..\qt_test\main.cpp:4:14: warning: unused parameter 'argc' [-Wunused-parameter] int main(int argc, char *argv[]) ^~~~ ..\qt_test\main.cpp:4:31: warning: unused parameter 'argv' [-Wunused-parameter] int main(int argc, char *argv[]) ^ g++ -Wl,-subsystem,console -mthreads -o debug\qt_test.exe debug/main.o -LF:\Musor\libav\build\usr\local\lib F:\Musor\libav\build\usr\local\lib\libavformat.dll.a C:\Qt\Qt5.14.2\5.14.2\mingw73_64\lib\libQt5SerialPort.a C:\Qt\Qt5.14.2\5.14.2\mingw73_64\lib\libQt5Core.a debug/main.o: In function `main': D:\projects_test\qt\qt_test\build-qt_test-Desktop_Qt_5_14_2_MinGW_64_bit-Debug/../qt_test/main.cpp:6: undefined reference to `avformat_license()' collect2.exe: error: ld returned 1 exit status mingw32-make[1]: *** [Makefile.Debug:68: debug/qt_test.exe] Error 1 mingw32-make: *** [Makefile:45: debug] Error 2 mingw32-make[1]: Leaving directory 'D:/projects_test/qt/qt_test/build-qt_test-Desktop_Qt_5_14_2_MinGW_64_bit-Debug' 18:45:50: The process "C:\Qt\Qt5.14.2\Tools\mingw730_64\bin\mingw32-make.exe" exited with code 2. Error while building/deploying project qt_test (kit: Desktop Qt 5.14.2 MinGW 64-bit) When executing step "Make"Whyyyyyyy?????
I have tried to change -llibavformat.dll to -lavformat, "-lavformat.dll" and "-lavformat" but i'm stil getting this error. -
Might be silly but try linking to all the ffmpeg libraries, just in case.
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Men, I really don't understand what is happening.
I installed msys2, and some packages for that, then i copied *c:\Qt\Qt5.14.2\Tools\mingw730_64* to *c:\msys64\mingw64*.
Then built libav (it is "small" version of FFmpeg) and got this files:build\usr\local\bin\avcodec.lib build\usr\local\bin\avcodec-58.dll build\usr\local\bin\avconv.exe build\usr\local\bin\avdevice.lib build\usr\local\bin\avdevice-57.dll build\usr\local\bin\avfilter.lib build\usr\local\bin\avfilter-7.dll build\usr\local\bin\avformat.lib build\usr\local\bin\avformat-58.dll build\usr\local\bin\avprobe.exe build\usr\local\bin\avresample.lib build\usr\local\bin\avresample-4.dll build\usr\local\bin\avutil.lib build\usr\local\bin\avutil-56.dll build\usr\local\bin\swscale.lib build\usr\local\bin\swscale-5.dll build\usr\local\include\libavcodec\ << here is *.h build\usr\local\include\libavdevice\ << here is *.h build\usr\local\include\libavfilter\ << here is *.h build\usr\local\include\libavformat\ << here is *.h build\usr\local\include\libavresample\ << here is *.h build\usr\local\include\libavutil\ << here is *.h build\usr\local\include\libswscale\ << here is *.h build\usr\local\lib\pkgconfig\ build\usr\local\lib\avcodec-58.def build\usr\local\lib\avdevice-57.def build\usr\local\lib\avfilter-7.def build\usr\local\lib\avformat-58.def build\usr\local\lib\avresample-4.def build\usr\local\lib\avutil-56.def build\usr\local\lib\libavcodec.dll.a build\usr\local\lib\libavdevice.dll.a build\usr\local\lib\libavfilter.dll.a build\usr\local\lib\libavformat.dll.a build\usr\local\lib\libavresample.dll.a build\usr\local\lib\libavutil.dll.a build\usr\local\lib\libswscale.dll.a build\usr\local\lib\swscale-5.def*c:\Qt\Qt5.14.2\Tools\mingw730_64* was added to PATH. When I start, for example, avconv.exe, it works ok, so definitely libav was built with true mingw (which uses qt).
Next, i added to *.pro (using "Add library...") this:win32: LIBS += -LF:/Musor/libav/build/usr/local/lib/ -llibavformat.dll INCLUDEPATH += F:/Musor/libav/build/usr/local/include DEPENDPATH += F:/Musor/libav/build/usr/local/includemain.c:
#include <libavformat/avformat.h> int main(int argc, char *argv[]) { avformat_license(); return 0; }After compilation i got:
C:/Qt/Qt5.14.2/Tools/mingw730_64/bin/mingw32-make -f Makefile.Debug mingw32-make[1]: Entering directory 'D:/projects_test/qt/qt_test/build-qt_test-Desktop_Qt_5_14_2_MinGW_64_bit-Debug' g++ -c -fno-keep-inline-dllexport -g -std=gnu++11 -Wall -Wextra -Wextra -fexceptions -mthreads -DUNICODE -D_UNICODE -DWIN32 -DMINGW_HAS_SECURE_API=1 -DQT_DEPRECATED_WARNINGS -DQT_QML_DEBUG -DQT_SERIALPORT_LIB -DQT_CORE_LIB -I..\qt_test -I. -IF:\Musor\libav\build\usr\local\include -IC:\Qt\Qt5.14.2\5.14.2\mingw73_64\include -IC:\Qt\Qt5.14.2\5.14.2\mingw73_64\include\QtSerialPort -IC:\Qt\Qt5.14.2\5.14.2\mingw73_64\include\QtCore -Idebug -IC:\Qt\Qt5.14.2\5.14.2\mingw73_64\mkspecs\win32-g++ -o debug\main.o ..\qt_test\main.cpp ..\qt_test\main.cpp: In function 'int main(int, char**)': ..\qt_test\main.cpp:4:14: warning: unused parameter 'argc' [-Wunused-parameter] int main(int argc, char *argv[]) ^~~~ ..\qt_test\main.cpp:4:31: warning: unused parameter 'argv' [-Wunused-parameter] int main(int argc, char *argv[]) ^ g++ -Wl,-subsystem,console -mthreads -o debug\qt_test.exe debug/main.o -LF:\Musor\libav\build\usr\local\lib F:\Musor\libav\build\usr\local\lib\libavformat.dll.a C:\Qt\Qt5.14.2\5.14.2\mingw73_64\lib\libQt5SerialPort.a C:\Qt\Qt5.14.2\5.14.2\mingw73_64\lib\libQt5Core.a debug/main.o: In function `main': D:\projects_test\qt\qt_test\build-qt_test-Desktop_Qt_5_14_2_MinGW_64_bit-Debug/../qt_test/main.cpp:6: undefined reference to `avformat_license()' collect2.exe: error: ld returned 1 exit status mingw32-make[1]: *** [Makefile.Debug:68: debug/qt_test.exe] Error 1 mingw32-make: *** [Makefile:45: debug] Error 2 mingw32-make[1]: Leaving directory 'D:/projects_test/qt/qt_test/build-qt_test-Desktop_Qt_5_14_2_MinGW_64_bit-Debug' 18:45:50: The process "C:\Qt\Qt5.14.2\Tools\mingw730_64\bin\mingw32-make.exe" exited with code 2. Error while building/deploying project qt_test (kit: Desktop Qt 5.14.2 MinGW 64-bit) When executing step "Make"Whyyyyyyy?????
I have tried to change -llibavformat.dll to -lavformat, "-lavformat.dll" and "-lavformat" but i'm stil getting this error.@BrMisha said in Showing stream video:
build\usr\local\bin\avformat.lib
build\usr\local\bin\avformat-58.dllnot sure if that's the issue, but you're showing libraries built in build\usr\local\bin but you're using build\usr\local\lib in your .pro file:
win32: LIBS += -LF:/Musor/libav/build/usr/local/lib/ -llibavformat.dll
In addition, and not sure since it's a long time I don't use libraries in Windows, also keep in mind that you have different names between the .lib and .dll files (avformat.lib vs. avformat-58.dll)
