Hi,
I’m learning how to do muxing with ffmpeg. I’m looking at the muxer.c example.
I’ve compiled ffmpeg with a minimal set of dependencies:
./configure --extra-cflags="-mmacosx-version-min=10.12" --disable-all
--disable-programs --enable-gpl --enable-small --enable-avcodec
--enable-swscale --enable-swresample --enable-avformat --enable-muxer=h264,mp4
--enable-demuxer=h264,mp4 --enable-encoder=libx264,aac
--enable-decoder=h264,aac --enable-encoder=h264_videotoolbox
--enable-parser=h264 --enable-libx264 --enable-hwaccel=h264_videotoolbox
--enable-videotoolbox --enable-protocol=file
--extra-cflags="-I/usr/local/include/" --extra-cxxflags="-I/usr/local/include/"
--extra-ldflags="-L/usr/local/lib/“
make
make examples
It is important to refer that I’ve ffmpeg installed via brew in my Mac system
Muxing example works out of the box.
However, when I copy the libs created during the compile process to a new
folder and try to compile only the muxer.c example:
gcc -Wall -g -o main main.c -L./ -lavformat -lavcodec -lavutil -lx264 -lswscale
-lswresample -framework CoreVideo -framework CoreMedia -framework AVFoundation
-framework VideoToolbox -framework AppKit -liconv -lz
The compilations goes fine but it crashes while running:
codec_par.c:35:
memset(par, 0, sizeof(*par)); par:0x8000000000000000000
1 _platform_bzero$VARIANT$Haswell
(x86_64) /usr/lib/system/libsystem_platform.dylib 0x7fff205ad4d5
2 codec_parameters_reset
codec_par.c 35 0x100213ee2
3 avcodec_parameters_from_context
codec_par.c 93 0x100213fab
4 open_video(AVFormatContext *, AVCodec const *, OutputStream *, AVDictionary
*) main.cpp 478 0x10000dc9a
5 main
main.cpp 627 0x10000d30d
6 start
(x86_64) /usr/lib/system/libdyld.dylib 0x7fff20585f5d
My guess is that the version of ffmpeg that I’ve compiled is not being used by
the examples. Instead, the example is using the system installed ffmpeg which
has something that I haven’t included in the config.
Why? Because if I take the “-L./“ parameter from the compilation command, it
will use the systems libs and this time, it won’t crash.
I’ve been tinkering around for hours and I don’t find any other explanation.
Does anyone has guess of what could be happening or missing in my configuration?
Thanks!
Regards,
Nuno
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