Google Chrome ships with support for proprietary codecs and Chromium can be built with support for them, either using the bundled FFmpeg or a system copy.
This leaves other browsers such as Opera and Vivaldi, which ship with a libffmpeg that does not support proprietary codecs, presumably for cost reasons. These projects actively encourage users to swap this library with an alternative. Official instructions say to download the very large Chromium tarball and use its build system to configure and build libffmpeg. This involves building a lot of extra baggage that simply isn't needed because libffmpeg is literally just the main FFmpeg libraries combined. Binary-based distributions can easily take this hit but for source-based distributions, this hit is passed onto the end user. This Makefile snippet allows libffmpeg to be created without the help of Chromium's build system. It uses the CONFIG_SHARED variable to decide whether to link the FFmpeg libraries statically or dynamically. In the latter case, libffmpeg is just a wrapper with no symbols of its own. At this current time, recent Chromium versions support the 3.x ABI with just one major exception. Unless built against the system copy, -DFF_API_CONVERGENCE_DURATION=0 is used. This means that, other factors notwithstanding, full compatibility will not be seen until libavcodec hits 59. This is why I have provided the ability to link FFmpeg statically. This is how to build libffmpeg for a recent Chromium-based release: ./configure --disable-shared --enable-static --enable-pic --extra-cflags="-DFF_API_CONVERGENCE_DURATION=0" make libffmpeg make install-libffmpeg I have tested this with FFmpeg 3.3.2 and latest master. I have tested it against current Opera Stable, Opera Beta, Opera Developer, Vivaldi Stable, and Vivaldi Snapshot. --- Makefile | 1 + ffbuild/libffmpeg.mak | 21 +++++++++++++++++++++ 2 files changed, 22 insertions(+) create mode 100644 ffbuild/libffmpeg.mak diff --git a/Makefile b/Makefile index 29870d7..1e267e7 100644 --- a/Makefile +++ b/Makefile @@ -65,6 +65,7 @@ all: all-yes include $(SRC_PATH)/tools/Makefile include $(SRC_PATH)/ffbuild/common.mak +include $(SRC_PATH)/ffbuild/libffmpeg.mak FF_EXTRALIBS := $(FFEXTRALIBS) FF_DEP_LIBS := $(DEP_LIBS) diff --git a/ffbuild/libffmpeg.mak b/ffbuild/libffmpeg.mak new file mode 100644 index 0000000..992cf3c --- /dev/null +++ b/ffbuild/libffmpeg.mak @@ -0,0 +1,21 @@ +LIBFFMPEG = $(SLIBPREF)ffmpeg$(SLIBSUF) +LIBFFMPEG_LINK = $(LD) -shared -Wl,-soname,$(LIBFFMPEG) -Wl,-Bsymbolic -Wl,-z,now -Wl,-z,relro -Wl,-z,defs -Wl,--gc-sections $(LDFLAGS) $(LDLIBFLAGS) -o $(LIBFFMPEG) + +libffmpeg-: libavcodec/$(LIBPREF)avcodec$(LIBSUF) libavformat/$(LIBPREF)avformat$(LIBSUF) libavutil/$(LIBPREF)avutil$(LIBSUF) libswresample/$(LIBPREF)swresample$(LIBSUF) + $(LIBFFMPEG_LINK) -Wl,--whole-archive $^ -Wl,--no-whole-archive $(FFEXTRALIBS) + +libffmpeg-yes: libavcodec/$(SLIBPREF)avcodec$(SLIBSUF) libavformat/$(SLIBPREF)avformat$(SLIBSUF) libavutil/$(SLIBPREF)avutil$(SLIBSUF) + $(LIBFFMPEG_LINK) -Wl,--no-as-needed -lavcodec -lavformat -lavutil + +$(LIBFFMPEG): libffmpeg-$(CONFIG_SHARED) +libffmpeg: $(LIBFFMPEG) + +install-libffmpeg: $(LIBFFMPEG) + $(Q)mkdir -p "$(SHLIBDIR)/chromium" + $(INSTALL) -m 755 $< "$(SHLIBDIR)/chromium/$<" + $(STRIP) "$(SHLIBDIR)/chromium/$<" + +uninstall-libffmpeg: + $(RM) "$(SHLIBDIR)/chromium/$(LIBFFMPEG)" + +.PHONY: libffmpeg libffmpeg-* install-libffmpeg -- 2.13.1 _______________________________________________ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-devel
