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• fftools/ffmpeg : Fix leak of AVFilterInOut in case of error

  23 août 2020, par Andreas Rheinhardt

  fftools/ffmpeg : Fix leak of AVFilterInOut in case of error
  The AVFilterInOuts normally get freed in init_output_filter() when
  
  the corresponding streams get created ; yet if an error happens before
  
  one reaches said point, they leak. Therefore this commit makes
  
  ffmpeg_cleanup free them, too.
  Fixes ticket #8267.
  Reviewed-by : Nicolas George <george@nsup.org>
  
  Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
  

  • [DH] fftools/ffmpeg.c

• 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 an array of strings as a function parameter in a function that builds another array

  22 octobre 2019, par NCrusher

  I start with an empty array :

  var ffmpegFilters = [String]()

  I have a button that should start an ffmpeg process when I click it :

  @IBAction func startConversionClicked(_ sender: Any) {
  
      //buildFfmpegString()
  
      ffmpegConvert(inputPath: inputFilePath, filters: ffmpegFilters, outputPath: "outputFilePath")
  
  }

  The function with the process looks like this :

  func ffmpegConvert(inputPath: String, filters: String, outputPath: String) {
  
      guard let launchPath = Bundle.main.path(forResource: "ffmpeg", ofType: "") else { return }
  
      do {
  
          let convertTask: Process = Process()
  
          convertTask.launchPath = launchPath
  
          convertTask.arguments = [
  
              "-i", inputPath,
  
              filters,
  
              outputPath
  
          ]
  
          convertTask.standardInput = FileHandle.nullDevice
  
          convertTask.launch()
  
          convertTask.waitUntilExit()
  
      }
  
  }

  the ffmpegFilters variable array is defined in another function :

  func conversionSelection() {
  
      if inputFileUrl != nil {
  
          let conversionChoice = conversionOptionsPopup.indexOfSelectedItem
  
          switch conversionChoice {
  
              case 1 :
  
                  outputExtension = ".mp3"
  
                  ffmpegFilters = ["-c:a libmp3lame", "-ac 1", "-ar 22050", "-q:a 9"]
  
              case 2 :
  
                  outputExtension = ".mp3"
  
                  ffmpegFilters = ["-c:a libmp3lame", "-ac 2", "-ar 44100", "-q:a 5"]
  
              case 3 :
  
                  outputExtension = ".mp3"
  
                  ffmpegFilters = ["-c:a libmp3lame", "-ac 1", "-ar 22050", "-b:a 32k"]
  
              case 4:
  
                  outputExtension = ".flac"
  
                  ffmpegFilters = ["-c:a flac"]
  
              default :
  
                  outputExtension = ".m4b"
  
                  ffmpegFilters = ["-c copy"]
  
          }
  
      }
  
  }

  So my array of strings is being used as an item in another array of strings.
  When I do this, my @IBAction at the top there gives me an error :

  Cannot convert value of type ’[String]’ to expected argument type
  ’String’

  And I’m not sure how to fix that. It’s really important I get the formatting of these ffmpeg arguments correct, because right now my project is stuck due to ffmpeg not liking the arguments Swift is passing to it in this process, so I’m trying to make everything relating to the arguments as bullet-proof as I can.