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• how to capture html5 video programmatically (headless)

  25 octobre 2019, par ygk

  I am trying to capture html5 video with js/css effects on it programmatically. I tried a couple of methods ;

  1. First I find this great blog post and implemented it. Everything was perfect till I found that phantomjs is not supporting html5 video tag so can not capture the video.

  2. Second option was to use headless chrome to take continuous screenshots and feed these screenshots into ffmpeg to create the video. Although it worked to some level headless chromes screenshots was taking some time.. I couldn’t create a smooth video..

  3. On my third try I gave a chance to chrome’s Page.startScreencast api. It could get video capture but frame rates was really problematic. The reason is that..

  4. Now I am working on xvfb + chrome/firefox + ffmpeg combination for capturing video as mentioned on that comment. Theoretically it is promising but I couldn’t managed to capture a video. Instead I have black screen..

  My setup is below :

  • light-http server having a simple video (web) within html5 video tag ; on localhost
  • start xvfb with Firefox and navigate to localhost/index.html ( video is there )
    xvfb-run --listen-tcp --server-num 44 --auth-file /tmp/xvfb.auth -s "-ac -screen 0 1440x685x24" firefox --headless http://localhost

  • start ffmpeg with x11grab parameter to grab frames from xvfb

    ffmpeg -f x11grab -video_size 1440x685 -i :44 -codec:v libx264 -r 12 ./output.mp4

  • the result is black video :)

  what should be the problem, how can I debug the problem ?

  ---

  ps : there is one more possible solution which I didn’t tried yet. As phantomjs has capability to capture canvas ; it may be possible to

  • put video into canvas
  • then capture the canvas

  It seems like a dirty workaround that is why not tried yet..

  ---

  UPDATE-1

  Tried to get screenshot with xwd -root -silent -display :44 -out screen.xwdand than convert to jpeg convert screen.xwd shot.jpg the result is black jpg..

• Building FFMPEG on UBUNTU facing issue while compiling common.mak file

  9 juin 2016, par sumit singh

  I am compiling the ffmpeg library i am facing some issues while compiling this.

  I follow the steps of compilation form here.But i am failed to compile.
  The issues are as below.

  WARNING: /home/sumit/android-ndk-r10e/toolchains/arm-linux-androideabi-4.8/prebuilt/linux-x86/bin/arm-linux-androideabi-pkg-config not found, library detection may fail.
  
  libavcodec/bsf_list.c is unchanged
  
  libavformat/protocol_list.c is unchanged
  
  common.mak:26: *** unterminated call to function `foreach': missing `)'.  Stop.
  
  common.mak:26: *** unterminated call to function `foreach': missing `)'.  Stop.
  
  common.mak:26: *** unterminated call to function `foreach': missing `)'.  Stop.
  
  sumit@sumit-H81M-S:~/android-ndk-r10e/sources/ffmpeg$ 

  here is my build_android.sh file-

  #!/bin/bash
  
  
  
  NDK=$HOME/android-ndk-r10e
  
  
  
  SYSROOT=$NDK/platforms/android-19/arch-arm/
  
  
  
  TOOLCHAIN=$NDK/toolchains/arm-linux-androideabi-4.8/prebuilt/linux-x86
  
  
  
  function build_one
  
  
  
  {
  
  ./configure --prefix=$PREFIX --enable-shared --disable-static --disable-doc --disable-ffmpeg --disable-ffplay --disable-ffprobe --disable-ffserver --disable-avdevice --disable-doc --disable-symver --cross-prefix=$TOOLCHAIN/bin/arm-linux-androideabi- --target-os=linux --arch=arm --enable-cross-compile --sysroot=$SYSROOT --extra-cflags="-Os -fpic $ADDI_CFLAGS" --extra-ldflags="$ADDI_LDFLAGS" 
  
  $ADDITIONAL_CONFIGURE_FLAG
  
  make clean
  
  make
  
  make install
  
  }
  
  
  
  CPU=arm
  
  
  
  PREFIX=$(pwd)/android/$CPU 
  
  
  
  ADDI_CFLAGS="-marm"
  
  
  
  build_one

  common.mak-

  #
  
  # common bits used by all libraries
  
  #
  
  
  
  # first so "all" becomes default target
  
  all: all-yes
  
  
  
  DEFAULT_YASMD=.dbg
  
  
  
  ifeq ($(DBG),1)
  
  YASMD=$(DEFAULT_YASMD)
  
  else
  
  YASMD=
  
  endif
  
  
  
  ifndef SUBDIR
  
  
  
  ifndef V
  
  Q      = @
  
  ECHO   = printf "$(1)\t%s\n" $(2)
  
  BRIEF  = CC CXX OBJCC HOSTCC HOSTLD AS YASM AR LD STRIP CP WINDRES
  
  SILENT = DEPCC DEPHOSTCC DEPAS DEPYASM RANLIB RM
  
  
  
  MSG    = $@
  
  M      = @$(call ECHO,$(TAG),$@);
  
  $(foreach VAR,$(BRIEF), \
  
      $(eval override $(VAR) = @$$(call ECHO,$(VAR),$$(MSG)); $($(VAR))))
  
  $(foreach VAR,$(SILENT),$(eval override $(VAR) = @$($(VAR))))
  
  $(eval INSTALL = @$(call ECHO,INSTALL,$$(^:$(SRC_DIR)/%=%)); $(INSTALL))
  
  endif
  
  
  
  ALLFFLIBS = avcodec avdevice avfilter avformat avresample avutil postproc swscale swresample
  
  
  
  # NASM requires -I path terminated with /
  
  IFLAGS     := -I. -I$(SRC_LINK)/
  
  CPPFLAGS   := $(IFLAGS) $(CPPFLAGS)
  
  CFLAGS     += $(ECFLAGS)
  
  CCFLAGS     = $(CPPFLAGS) $(CFLAGS)
  
  OBJCFLAGS  += $(EOBJCFLAGS)
  
  OBJCCFLAGS  = $(CPPFLAGS) $(CFLAGS) $(OBJCFLAGS)
  
  ASFLAGS    := $(CPPFLAGS) $(ASFLAGS)
  
  CXXFLAGS   += $(CPPFLAGS) $(CFLAGS)
  
  YASMFLAGS  += $(IFLAGS:%=%/) -Pconfig.asm
  
  
  
  HOSTCCFLAGS = $(IFLAGS) $(HOSTCPPFLAGS) $(HOSTCFLAGS)
  
  LDFLAGS    := $(ALLFFLIBS:%=$(LD_PATH)lib%) $(LDFLAGS)
  
  
  
  define COMPILE
  
         $(call $(1)DEP,$(1))
  
         $($(1)) $($(1)FLAGS) $($(1)_DEPFLAGS) $($(1)_C) $($(1)_O) $(patsubst $(SRC_PATH)/%,$(SRC_LINK)/%,$<)
  
  endef
  
  
  
  COMPILE_C = $(call COMPILE,CC)
  
  COMPILE_CXX = $(call COMPILE,CXX)
  
  COMPILE_S = $(call COMPILE,AS)
  
  COMPILE_M = $(call COMPILE,OBJCC)
  
  COMPILE_HOSTC = $(call COMPILE,HOSTCC)
  
  
  
  %.o: %.c
  
      $(COMPILE_C)
  
  
  
  %.o: %.cpp
  
      $(COMPILE_CXX)
  
  
  
  %.o: %.m
  
      $(COMPILE_M)
  
  
  
  %.s: %.c
  
      $(CC) $(CCFLAGS) -S -o $@ $<
  
  
  
  %.o: %.S
  
      $(COMPILE_S)
  
  
  
  %_host.o: %.c
  
      $(COMPILE_HOSTC)
  
  
  
  %.o: %.rc
  
      $(WINDRES) $(IFLAGS) --preprocessor "$(DEPWINDRES) -E -xc-header -DRC_INVOKED $(CC_DEPFLAGS)" -o $@ $<
  
  
  
  %.i: %.c
  
      $(CC) $(CCFLAGS) $(CC_E) $<
  
  
  
  %.h.c:
  
      $(Q)echo '#include "$*.h"' >$@
  
  
  
  %.ver: %.v
  
      $(Q)sed 's/$$MAJOR/$($(basename $(@F))_VERSION_MAJOR)/' $^ | sed -e 's/:/:\
  
  /' -e 's/; /;\
  
  /g' > $@
  
  
  
  %.c %.h: TAG = GEN
  
  
  
  # Dummy rule to stop make trying to rebuild removed or renamed headers
  
  %.h:
  
      @:
  
  
  
  # Disable suffix rules.  Most of the builtin rules are suffix rules,
  
  # so this saves some time on slow systems.
  
  .SUFFIXES:
  
  
  
  # Do not delete intermediate files from chains of implicit rules
  
  $(OBJS):
  
  endif
  
  
  
  include $(SRC_PATH)/arch.mak
  
  
  
  OBJS      += $(OBJS-yes)
  
  SLIBOBJS  += $(SLIBOBJS-yes)
  
  FFLIBS    := $($(NAME)_FFLIBS) $(FFLIBS-yes) $(FFLIBS)
  
  TESTPROGS += $(TESTPROGS-yes)
  
  
  
  LDLIBS       = $(FFLIBS:%=%$(BUILDSUF))
  
  FFEXTRALIBS := $(LDLIBS:%=$(LD_LIB)) $(EXTRALIBS)
  
  
  
  OBJS      := $(sort $(OBJS:%=$(SUBDIR)%))
  
  SLIBOBJS  := $(sort $(SLIBOBJS:%=$(SUBDIR)%))
  
  TESTOBJS  := $(TESTOBJS:%=$(SUBDIR)%) $(TESTPROGS:%=$(SUBDIR)%-test.o)
  
  TESTPROGS := $(TESTPROGS:%=$(SUBDIR)%-test$(EXESUF))
  
  HOSTOBJS  := $(HOSTPROGS:%=$(SUBDIR)%.o)
  
  HOSTPROGS := $(HOSTPROGS:%=$(SUBDIR)%$(HOSTEXESUF))
  
  TOOLS     += $(TOOLS-yes)
  
  TOOLOBJS  := $(TOOLS:%=tools/%.o)
  
  TOOLS     := $(TOOLS:%=tools/%$(EXESUF))
  
  HEADERS   += $(HEADERS-yes)
  
  
  
  PATH_LIBNAME = $(foreach NAME,$(1),lib$(NAME)/$($(2)LIBNAME))
  
  DEP_LIBS := $(foreach lib,$(FFLIBS),$(call PATH_LIBNAME,$(lib),$(CONFIG_SHARED:yes=S)))
  
  STATIC_DEP_LIBS := $(foreach lib,$(FFLIBS),$(call PATH_LIBNAME,$(lib)))
  
  
  
  SRC_DIR    := $(SRC_PATH)/lib$(NAME)
  
  ALLHEADERS := $(subst $(SRC_DIR)/,$(SUBDIR),$(wildcard $(SRC_DIR)/*.h $(SRC_DIR)/$(ARCH)/*.h))
  
  SKIPHEADERS += $(ARCH_HEADERS:%=$(ARCH)/%) $(SKIPHEADERS-)
  
  SKIPHEADERS := $(SKIPHEADERS:%=$(SUBDIR)%)
  
  HOBJS        = $(filter-out $(SKIPHEADERS:.h=.h.o),$(ALLHEADERS:.h=.h.o))
  
  checkheaders: $(HOBJS)
  
  .SECONDARY:   $(HOBJS:.o=.c)
  
  
  
  alltools: $(TOOLS)
  
  
  
  $(HOSTOBJS): %.o: %.c
  
      $(COMPILE_HOSTC)
  
  
  
  $(HOSTPROGS): %$(HOSTEXESUF): %.o
  
      $(HOSTLD) $(HOSTLDFLAGS) $(HOSTLD_O) $^ $(HOSTLIBS)
  
  
  
  $(OBJS):     | $(sort $(dir $(OBJS)))
  
  $(HOBJS):    | $(sort $(dir $(HOBJS)))
  
  $(HOSTOBJS): | $(sort $(dir $(HOSTOBJS)))
  
  $(SLIBOBJS): | $(sort $(dir $(SLIBOBJS)))
  
  $(TESTOBJS): | $(sort $(dir $(TESTOBJS)))
  
  $(TOOLOBJS): | tools
  
  
  
  OBJDIRS := $(OBJDIRS) $(dir $(OBJS) $(HOBJS) $(HOSTOBJS) $(SLIBOBJS) $(TESTOBJS))
  
  
  
  CLEANSUFFIXES     = *.d *.o *~ *.h.c *.map *.ver *.ver-sol2 *.ho *.gcno *.gcda *$(DEFAULT_YASMD).asm
  
  DISTCLEANSUFFIXES = *.pc
  
  LIBSUFFIXES       = *.a *.lib *.so *.so.* *.dylib *.dll *.def *.dll.a
  
  
  
  define RULES
  
  clean::
  
      $(RM) $(HOSTPROGS)
  
      $(RM) $(TOOLS)
  
  endef
  
  
  
  $(eval $(RULES))
  
  
  
  -include $(wildcard $(OBJS:.o=.d) $(HOSTOBJS:.o=.d) $(TESTOBJS:.o=.d) $(HOBJS:.o=.d) $(SLIBOBJS:.o=.d)) $(OBJS:.o=$(DEFAULT_YASMD).d)

• FFMPEG facing issue while compiling common.mak file

  9 juin 2016, par sumit singh

  I am compiling the ffmpeg library i am facing some issues while compiling this.

  I follow the steps of compilation form here.But i am failed to compile.
  The issues are as below.

  WARNING: /home/sumit/android-ndk-r10e/toolchains/arm-linux-androideabi-4.8/prebuilt/linux-x86/bin/arm-linux-androideabi-pkg-config not found, library detection may fail.
  
  libavcodec/bsf_list.c is unchanged
  
  libavformat/protocol_list.c is unchanged
  
  common.mak:26: *** unterminated call to function `foreach': missing `)'.  Stop.
  
  common.mak:26: *** unterminated call to function `foreach': missing `)'.  Stop.
  
  common.mak:26: *** unterminated call to function `foreach': missing `)'.  Stop.
  
  sumit@sumit-H81M-S:~/android-ndk-r10e/sources/ffmpeg$ 

  here is my build_android.sh file-

  #!/bin/bash
  
  
  
  NDK=$HOME/android-ndk-r10e
  
  
  
  SYSROOT=$NDK/platforms/android-19/arch-arm/
  
  
  
  TOOLCHAIN=$NDK/toolchains/arm-linux-androideabi-4.8/prebuilt/linux-x86
  
  
  
  function build_one
  
  
  
  {
  
  ./configure --prefix=$PREFIX --enable-shared --disable-static --disable-doc --disable-ffmpeg --disable-ffplay --disable-ffprobe --disable-ffserver --disable-avdevice --disable-doc --disable-symver --cross-prefix=$TOOLCHAIN/bin/arm-linux-androideabi- --target-os=linux --arch=arm --enable-cross-compile --sysroot=$SYSROOT --extra-cflags="-Os -fpic $ADDI_CFLAGS" --extra-ldflags="$ADDI_LDFLAGS" 
  
  $ADDITIONAL_CONFIGURE_FLAG
  
  make clean
  
  make
  
  make install
  
  }
  
  
  
  CPU=arm
  
  
  
  PREFIX=$(pwd)/android/$CPU 
  
  
  
  ADDI_CFLAGS="-marm"
  
  
  
  build_one

  common.mak-

  #
  
  # common bits used by all libraries
  
  #
  
  
  
  # first so "all" becomes default target
  
  all: all-yes
  
  
  
  DEFAULT_YASMD=.dbg
  
  
  
  ifeq ($(DBG),1)
  
  YASMD=$(DEFAULT_YASMD)
  
  else
  
  YASMD=
  
  endif
  
  
  
  ifndef SUBDIR
  
  
  
  ifndef V
  
  Q      = @
  
  ECHO   = printf "$(1)\t%s\n" $(2)
  
  BRIEF  = CC CXX OBJCC HOSTCC HOSTLD AS YASM AR LD STRIP CP WINDRES
  
  SILENT = DEPCC DEPHOSTCC DEPAS DEPYASM RANLIB RM
  
  
  
  MSG    = $@
  
  M      = @$(call ECHO,$(TAG),$@);
  
  $(foreach VAR,$(BRIEF), \
  
      $(eval override $(VAR) = @$$(call ECHO,$(VAR),$$(MSG)); $($(VAR))))
  
  $(foreach VAR,$(SILENT),$(eval override $(VAR) = @$($(VAR))))
  
  $(eval INSTALL = @$(call ECHO,INSTALL,$$(^:$(SRC_DIR)/%=%)); $(INSTALL))
  
  endif
  
  
  
  ALLFFLIBS = avcodec avdevice avfilter avformat avresample avutil postproc swscale swresample
  
  
  
  # NASM requires -I path terminated with /
  
  IFLAGS     := -I. -I$(SRC_LINK)/
  
  CPPFLAGS   := $(IFLAGS) $(CPPFLAGS)
  
  CFLAGS     += $(ECFLAGS)
  
  CCFLAGS     = $(CPPFLAGS) $(CFLAGS)
  
  OBJCFLAGS  += $(EOBJCFLAGS)
  
  OBJCCFLAGS  = $(CPPFLAGS) $(CFLAGS) $(OBJCFLAGS)
  
  ASFLAGS    := $(CPPFLAGS) $(ASFLAGS)
  
  CXXFLAGS   += $(CPPFLAGS) $(CFLAGS)
  
  YASMFLAGS  += $(IFLAGS:%=%/) -Pconfig.asm
  
  
  
  HOSTCCFLAGS = $(IFLAGS) $(HOSTCPPFLAGS) $(HOSTCFLAGS)
  
  LDFLAGS    := $(ALLFFLIBS:%=$(LD_PATH)lib%) $(LDFLAGS)
  
  
  
  define COMPILE
  
         $(call $(1)DEP,$(1))
  
         $($(1)) $($(1)FLAGS) $($(1)_DEPFLAGS) $($(1)_C) $($(1)_O) $(patsubst $(SRC_PATH)/%,$(SRC_LINK)/%,$<)
  
  endef
  
  
  
  COMPILE_C = $(call COMPILE,CC)
  
  COMPILE_CXX = $(call COMPILE,CXX)
  
  COMPILE_S = $(call COMPILE,AS)
  
  COMPILE_M = $(call COMPILE,OBJCC)
  
  COMPILE_HOSTC = $(call COMPILE,HOSTCC)
  
  
  
  %.o: %.c
  
      $(COMPILE_C)
  
  
  
  %.o: %.cpp
  
      $(COMPILE_CXX)
  
  
  
  %.o: %.m
  
      $(COMPILE_M)
  
  
  
  %.s: %.c
  
      $(CC) $(CCFLAGS) -S -o $@ $<
  
  
  
  %.o: %.S
  
      $(COMPILE_S)
  
  
  
  %_host.o: %.c
  
      $(COMPILE_HOSTC)
  
  
  
  %.o: %.rc
  
      $(WINDRES) $(IFLAGS) --preprocessor "$(DEPWINDRES) -E -xc-header -DRC_INVOKED $(CC_DEPFLAGS)" -o $@ $<
  
  
  
  %.i: %.c
  
      $(CC) $(CCFLAGS) $(CC_E) $<
  
  
  
  %.h.c:
  
      $(Q)echo '#include "$*.h"' >$@
  
  
  
  %.ver: %.v
  
      $(Q)sed 's/$$MAJOR/$($(basename $(@F))_VERSION_MAJOR)/' $^ | sed -e 's/:/:\
  
  /' -e 's/; /;\
  
  /g' > $@
  
  
  
  %.c %.h: TAG = GEN
  
  
  
  # Dummy rule to stop make trying to rebuild removed or renamed headers
  
  %.h:
  
      @:
  
  
  
  # Disable suffix rules.  Most of the builtin rules are suffix rules,
  
  # so this saves some time on slow systems.
  
  .SUFFIXES:
  
  
  
  # Do not delete intermediate files from chains of implicit rules
  
  $(OBJS):
  
  endif
  
  
  
  include $(SRC_PATH)/arch.mak
  
  
  
  OBJS      += $(OBJS-yes)
  
  SLIBOBJS  += $(SLIBOBJS-yes)
  
  FFLIBS    := $($(NAME)_FFLIBS) $(FFLIBS-yes) $(FFLIBS)
  
  TESTPROGS += $(TESTPROGS-yes)
  
  
  
  LDLIBS       = $(FFLIBS:%=%$(BUILDSUF))
  
  FFEXTRALIBS := $(LDLIBS:%=$(LD_LIB)) $(EXTRALIBS)
  
  
  
  OBJS      := $(sort $(OBJS:%=$(SUBDIR)%))
  
  SLIBOBJS  := $(sort $(SLIBOBJS:%=$(SUBDIR)%))
  
  TESTOBJS  := $(TESTOBJS:%=$(SUBDIR)%) $(TESTPROGS:%=$(SUBDIR)%-test.o)
  
  TESTPROGS := $(TESTPROGS:%=$(SUBDIR)%-test$(EXESUF))
  
  HOSTOBJS  := $(HOSTPROGS:%=$(SUBDIR)%.o)
  
  HOSTPROGS := $(HOSTPROGS:%=$(SUBDIR)%$(HOSTEXESUF))
  
  TOOLS     += $(TOOLS-yes)
  
  TOOLOBJS  := $(TOOLS:%=tools/%.o)
  
  TOOLS     := $(TOOLS:%=tools/%$(EXESUF))
  
  HEADERS   += $(HEADERS-yes)
  
  
  
  PATH_LIBNAME = $(foreach NAME,$(1),lib$(NAME)/$($(2)LIBNAME))
  
  DEP_LIBS := $(foreach lib,$(FFLIBS),$(call PATH_LIBNAME,$(lib),$(CONFIG_SHARED:yes=S)))
  
  STATIC_DEP_LIBS := $(foreach lib,$(FFLIBS),$(call PATH_LIBNAME,$(lib)))
  
  
  
  SRC_DIR    := $(SRC_PATH)/lib$(NAME)
  
  ALLHEADERS := $(subst $(SRC_DIR)/,$(SUBDIR),$(wildcard $(SRC_DIR)/*.h $(SRC_DIR)/$(ARCH)/*.h))
  
  SKIPHEADERS += $(ARCH_HEADERS:%=$(ARCH)/%) $(SKIPHEADERS-)
  
  SKIPHEADERS := $(SKIPHEADERS:%=$(SUBDIR)%)
  
  HOBJS        = $(filter-out $(SKIPHEADERS:.h=.h.o),$(ALLHEADERS:.h=.h.o))
  
  checkheaders: $(HOBJS)
  
  .SECONDARY:   $(HOBJS:.o=.c)
  
  
  
  alltools: $(TOOLS)
  
  
  
  $(HOSTOBJS): %.o: %.c
  
      $(COMPILE_HOSTC)
  
  
  
  $(HOSTPROGS): %$(HOSTEXESUF): %.o
  
      $(HOSTLD) $(HOSTLDFLAGS) $(HOSTLD_O) $^ $(HOSTLIBS)
  
  
  
  $(OBJS):     | $(sort $(dir $(OBJS)))
  
  $(HOBJS):    | $(sort $(dir $(HOBJS)))
  
  $(HOSTOBJS): | $(sort $(dir $(HOSTOBJS)))
  
  $(SLIBOBJS): | $(sort $(dir $(SLIBOBJS)))
  
  $(TESTOBJS): | $(sort $(dir $(TESTOBJS)))
  
  $(TOOLOBJS): | tools
  
  
  
  OBJDIRS := $(OBJDIRS) $(dir $(OBJS) $(HOBJS) $(HOSTOBJS) $(SLIBOBJS) $(TESTOBJS))
  
  
  
  CLEANSUFFIXES     = *.d *.o *~ *.h.c *.map *.ver *.ver-sol2 *.ho *.gcno *.gcda *$(DEFAULT_YASMD).asm
  
  DISTCLEANSUFFIXES = *.pc
  
  LIBSUFFIXES       = *.a *.lib *.so *.so.* *.dylib *.dll *.def *.dll.a
  
  
  
  define RULES
  
  clean::
  
      $(RM) $(HOSTPROGS)
  
      $(RM) $(TOOLS)
  
  endef
  
  
  
  $(eval $(RULES))
  
  
  
  -include $(wildcard $(OBJS:.o=.d) $(HOSTOBJS:.o=.d) $(TESTOBJS:.o=.d) $(HOBJS:.o=.d) $(SLIBOBJS:.o=.d)) $(OBJS:.o=$(DEFAULT_YASMD).d)