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• System reboots during ffmpeg tool installation

  11 novembre 2016, par JeeBoomBaa

  I have enabled QSV with reference of the streambuilder’s enabling-iqsv docs.

  MACHINE DETAILS

  Server : Intel(R) Xeon(R) CPU E3-1285 v4 3.50GHz w/ Supermicro X10SLH-F

  Kernel : Linux 3.10.0-229.1.2.44985.MSSr7.el7.centos.x86_64 #1 SMP Wed Nov 9 16:26:25 PST 2016 x86_64 x86_64 x86_64 GNU/Linux

  I have installed ffmpeg with —enable-nonfree —enable-libmfx configurations, configuration command was successfully done.Then, I invoke make and our server gets hanged in few seconds and it will gets rebooted automatically.

  I feel it might be compilation issue with make script.

  ./configure --prefix="/usr/ffmpeg" --extra-cflags="-I$HOME/ffmpeg_build/include" --extra-ldflags="-L$HOME/ffmpeg_build/lib" --bindir="$HOME/bin" --pkg-config-flags="--static" --enable-nonfree --enable-libmfx
  
  make 
  
  --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=2068, si_status=0, si_utime=0, si_stime=0} ---
  
  rt_sigreturn()                          = 2068
  
  rt_sigprocmask(SIG_BLOCK, [HUP INT QUIT TERM XCPU XFSZ], NULL, 8) = 0
  
  rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
  
  stat("libavcodec/intrax8dsp.o", {st_mode=S_IFREG|0644, st_size=82840, ...}) = 0
  
  stat("libavcodec/ituh263dec.o", 0x7ffff86affb0) = -1 ENOENT (No such file or directory)
  
  stat("libavcodec/ituh263dec.c", {st_mode=S_IFREG|0644, st_size=38617, ...}) = 0
  
  rt_sigprocmask(SIG_BLOCK, [HUP INT QUIT TERM XCPU XFSZ], NULL, 8) = 0
  
  vfork()                                 = 2072
  
  rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
  
  wait4(-1, CC libavcodec/ituh263dec.o

  I have attached config.log and FFMPEG-MAKE-TRACE.log file.

• how to call a c function in the C++ function with the same name ?

  25 juillet 2013, par wolfz

  how to call a c function in the C++ function with the same name ?
  calling 'extern "c"' to use c header and ": :"operation to use the c function,
  but the link error occur.

  my code :

  extern "C" {
  
  #include <libavcodec></libavcodec>avcodec.h>
  
  }
  
  ...
  
  class DllAvCodec 
  
  {
  
    public:
  
    ...
  
    virtual void av_free_packet(AVPacket *pkt) { ::av_free_packet(pkt); }
  
    ...
  
  }

  the error :

  D:/player/jni/lib/DllAvCodec.h:143: error: undefined reference to 'av_free_packet(AVPacket*)'

  why the code "::av_free_packet(pkt)" invoke undefined ?

  my Android.mk is :

  LOCAL_PATH := $(call my-dir)
  
  DEFINES += \
  
             -DTARGET_POSIX \
  
             -DTARGET_LINUX \
  
             -D_LINUX \
  
             -DTARGET_ANDROID \
  
             -D__STDC_CONSTANT_MACROS 
  
  
  
  ######################################
  
  #build ffmpeg prebuilt lib
  
  ######################################
  
  include $(CLEAR_VARS)  
  
  LOCAL_MODULE := libavcodec
  
  LOCAL_SRC_FILES := lib/lib/libavcodec.a 
  
  LOCAL_EXPORT_C_INCLUDES +=$(LOCAL_PATH)/lib/include
  
  include $(PREBUILT_STATIC_LIBRARY)
  
  
  
  include $(CLEAR_VARS)  
  
  LOCAL_MODULE := libavfilter  
  
  LOCAL_SRC_FILES := lib/lib/libavfilter.a
  
  LOCAL_EXPORT_C_INCLUDES +=$(LOCAL_PATH)/lib/include
  
  include $(PREBUILT_STATIC_LIBRARY)
  
  
  
  include $(CLEAR_VARS)  
  
  LOCAL_MODULE := libavformat  
  
  LOCAL_SRC_FILES := lib/lib/libavformat.a  
  
  LOCAL_EXPORT_C_INCLUDES +=$(LOCAL_PATH)/lib/include
  
  include $(PREBUILT_STATIC_LIBRARY)
  
  
  
  include $(CLEAR_VARS)  
  
  LOCAL_MODULE := libavutil  
  
  LOCAL_SRC_FILES := lib/lib/libavutil.a  
  
  LOCAL_EXPORT_C_INCLUDES +=$(LOCAL_PATH)/lib/include
  
  include $(PREBUILT_STATIC_LIBRARY)
  
  
  
  include $(CLEAR_VARS)  
  
  LOCAL_MODULE := libpostproc  
  
  LOCAL_SRC_FILES := lib/lib/libpostproc.a   
  
  LOCAL_EXPORT_C_INCLUDES +=$(LOCAL_PATH)/lib/include
  
  include $(PREBUILT_STATIC_LIBRARY)
  
  
  
  include $(CLEAR_VARS)  
  
  LOCAL_MODULE := libswresample  
  
  LOCAL_SRC_FILES := lib/lib/libswresample.a   
  
  LOCAL_EXPORT_C_INCLUDES +=$(LOCAL_PATH)/lib/include
  
  include $(PREBUILT_STATIC_LIBRARY)
  
  
  
  include $(CLEAR_VARS)  
  
  LOCAL_MODULE := libswscale  
  
  LOCAL_SRC_FILES := lib/lib/libswscale.a
  
  LOCAL_EXPORT_C_INCLUDES +=$(LOCAL_PATH)/lib/include
  
  include $(PREBUILT_STATIC_LIBRARY)
  
  
  
  
  
  ######################################
  
  #build lib
  
  ######################################
  
  include $(CLEAR_VARS)
  
  LOCAL_MODULE:= player
  
  base := $(LOCAL_PATH)
  
  
  
  LOCAL_SRC_FILES += ......
  
  
  
  LOCAL_CPPFLAGS += -Wall -fexceptions $(DEFINES)  
  
  LOCAL_LDLIBS += -llog -lz
  
  LOCAL_LDFLAGS += -L../jni/lib/lib  -lavcodec -lavformat  -lavutil -lavfilter -lpostproc  -lswscale -lswresample
  
  
  
  LOCAL_STATIC_LIBRARIES := libavcodec \
  
                            libavformat \
  
                            libavutil \
  
                            libavfilter \
  
                            libpostproc \
  
                            libswscale \
  
                            libswresample 
  
  
  
  include $(BUILD_SHARED_LIBRARY)

• Using ffmpeg to split videos into frames doesn't work

  28 décembre 2018, par אבנר יעקב

  In my code i’m trying to split video to frames using ffmpeg.

  for this I’m using this code

  experiments = ['iguazu.mp4', 'boat.mp4']
  
  
  
  for experiment in experiments:
  
      exp_no_ext = experiment.split('.')[0]
  
      os.system('mkdir dump')
  
      os.system('mkdir dump\%s' % exp_no_ext)
  
      os.system("ffmpeg -i videos\%s dump\%s\%s%%03d.jpg" % (experiment, 
  
  exp_no_ext, exp_no_ext))

  So in visual studio code it’s working perfect but in visual studio community the line "os.system("ffmpeg -i videos\%s dump\%s\%s%%03d.jpg" % (experiment,
  exp_no_ext, exp_no_ext))" showing error "ffmpeg is not recognized as an internal or external command".