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• How to pass command line arguments to FFMpeg in iOS

  23 septembre 2014, par Arif Nadeem

  This is a beginner question, since I am new to iOS(I started it today), so please pardon my ignorance and lack of iOS knowledge.

  After building and successfully using FFMpeg for Android I wanted to do the same for iOS.
  So I built FFMpeg successfully for iOS by following this link, but after all that pain I am confused as how to use FFMpeg in iOS, I mean how can I pass command line arguments to libffmpeg.a file ?

  I am assuming that there must be a way to run the .a file as an executable and then pass command line arguments and hope for FFMpeg to do the magic, I did the same in Android and it worked beautifully.

  I am also aware that I can use ffmpeg.c class and use its main method, but the question remains ; how do I pass those command line arguments ?

  Is there something I am supposed to be aware of here, is the thing what I am doing now correct or am I falling short on my approach ?

  I wanted to mix two audio files, so the command for doing that would be ffmpeg -i firstSound.wav -i secondSound.wav -filter_complex amix=inputs=2:duration=longest finalOutput.wav, how do I do the same in iOS ?

  Can someone please shed some light on this ?

• Android.mk include ffmpeg and Opencv

  28 janvier 2013, par Mark

  this is my project situation : I compiled ffmpeg in windows using this tutorial and I imported the ffmpeg folder generated inside my android project (under jni folder).
  In my project I have a jni_part.cpp where I inserted my jni function to operate with opencv.
  In my Android.mk I'm using the code below to import opencv and compile the jni_part.cpp

  include $(CLEAR_VARS)
  
  include ../../sdk/native/jni/OpenCV.mk
  
  LOCAL_MODULE    := mixed_sample
  
  LOCAL_SRC_FILES := jni_part.cpp
  
  LOCAL_LDLIBS +=  -llog -ldl 
  
  LOCAL_SHARED_LIBRARY := ffmpeg-prebuilt
  
  include $(BUILD_SHARED_LIBRARY)

  But what code I should use to import also ffmpeg ? I tried to use this code :

  include $(CLEAR_VARS)
  
  LOCAL_MODULE := ffmpeg-prebuilt
  
  LOCAL_SRC_FILES := ffmpeg-0.8/android/armv7-a/libffmpeg.so
  
  LOCAL_EXPORT_C_INCLUDES := ffmpeg-0.8/android/armv7-a/include/
  
  LOCAL_EXPORT_LDLIBS := ffmpeg-0.8/android/armv7-a/libffmpeg.so
  
  LOCAL_PRELINK_MODULE := true
  
  include $(PREBUILT_SHARED_LIBRARY)

  but if from mu jni_part.cpp code I try to include the file "#include " I get this error :

  **** Build of configuration Default for project OpenCV Tutorial 4 - Mix Java+Native OpenCV ****
  
  
  
  C:\android-ndk-r8c\ndk-build.cmd 
  
  Prebuilt       : libffmpeg.so <= jni/ffmpeg-0.8/android/armv7-a/
  
  Install        : libffmpeg.so => libs/armeabi-v7a/libffmpeg.so
  
  "Compile++ thumb : mixed_sample <= jni_part.cpp
  
  jni/jni_part.cpp:24:32: fatal error: libavutil/avstring.h: No such file or directory
  
  compilation terminated.
  
  make: *** [obj/local/armeabi-v7a/objs/mixed_sample/jni_part.o] Error 1
  
  
  
  **** Build Finished ****

  Someone could help me please ? I need to do this to include ffmpeg codec with the hope to use the function cvCaptureFromAVi...
  Thanks in advance

• Android.mk : how to include ffmpeg and Opencv

  28 janvier 2013, par Mark

  this is my project situation : I compiled ffmpeg in windows using this tutorial and I imported the ffmpeg folder (with inside libffmpeg.so file) generated inside my android project (under jni folder).
  In my project I have a jni_part.cpp where I inserted my jni function to operate with opencv.
  In my Android.mk I'm using the code below to import opencv and compile the jni_part.cpp

  include $(CLEAR_VARS)
  
  include ../../sdk/native/jni/OpenCV.mk
  
  LOCAL_MODULE    := mixed_sample
  
  LOCAL_SRC_FILES := jni_part.cpp
  
  LOCAL_LDLIBS +=  -llog -ldl 
  
  LOCAL_SHARED_LIBRARY := ffmpeg-prebuilt
  
  include $(BUILD_SHARED_LIBRARY)

  But what code I should use to import also ffmpeg ? I tried to use this code :

  include $(CLEAR_VARS)
  
  LOCAL_MODULE := ffmpeg-prebuilt
  
  LOCAL_SRC_FILES := ffmpeg-0.8/android/armv7-a/libffmpeg.so
  
  LOCAL_EXPORT_C_INCLUDES := ffmpeg-0.8/android/armv7-a/include/
  
  LOCAL_EXPORT_LDLIBS := ffmpeg-0.8/android/armv7-a/libffmpeg.so
  
  LOCAL_PRELINK_MODULE := true
  
  include $(PREBUILT_SHARED_LIBRARY)

  but if from my jni_part.cpp code I try to include some ffmpeg files/libraries "#include <libavutil></libavutil>avstring.h>" I get this error :

  **** Build of configuration Default for project OpenCV Tutorial 4 - Mix Java+Native OpenCV ****
  
  
  
  C:\android-ndk-r8c\ndk-build.cmd 
  
  Prebuilt       : libffmpeg.so <= jni/ffmpeg-0.8/android/armv7-a/
  
  Install        : libffmpeg.so => libs/armeabi-v7a/libffmpeg.so
  
  "Compile++ thumb : mixed_sample <= jni_part.cpp
  
  jni/jni_part.cpp:24:32: fatal error: libavutil/avstring.h: No such file or directory
  
  compilation terminated.
  
  make: *** [obj/local/armeabi-v7a/objs/mixed_sample/jni_part.o] Error 1
  
  
  
  **** Build Finished ****

  Someone could help me please ? I need to do this to include ffmpeg codec with the hope to use the function cvCaptureFromAVi...
  Thanks in advance