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• Android ndk ffmpeg : Unknown mnemonic error

  1er juin 2016, par Wasabi.Mayo

  I’m building a simple video app and want to embed a watermark on the recorded videos. I am using ffmpeg for this process and have successfully compiled it. The issue is when I try to link it with my project in Android Studio using ndk-build.cmd command, it gives me the following error :

  C:\Users\MyPC\AppData\Local\Temp\ccIRLDZn.s: Assembler messages:
  
  C:\Users\MyPC\AppData\Local\Temp\ccIRLDZn.s:8547: Error: unknown mnemonic `itt' -- `itt gt'
  
  C:\Users\MyPC\AppData\Local\Temp\ccIRLDZn.s:8548: Error: unknown mnemonic `movgt' -- `movgt x25,x0'
  
  C:\Users\MyPC\AppData\Local\Temp\ccIRLDZn.s:8549: Error: unknown mnemonic `movgt' -- `movgt x0,x1'
  
  C:\Users\MyPC\AppData\Local\Temp\ccIRLDZn.s:8551: Error: unknown mnemonic `it' -- `it le'
  
  C:\Users\MyPC\AppData\Local\Temp\ccIRLDZn.s:8552: Error: unknown mnemonic `movle' -- `movle x0,x2'
  
  C:\Users\MyPC\AppData\Local\Temp\ccIRLDZn.s:8554: Error: unknown mnemonic `it' -- `it gt'
  
  C:\Users\MyPC\AppData\Local\Temp\ccIRLDZn.s:8555: Error: unknown mnemonic `movgt' -- `movgt x25,x0'
  
  make: *** [obj/local/arm64-v8a/objs/myProject_Videokit/ffmpeg.o] Error 1

  My development environment is

  • OS : Windows10 x86_64
  • Command line : Cygwin 64bit
  • Android NDK version : android-ndk-r11c
  • ffmpeg version : ffmpeg-3.0.2
  • Android Studio : 2.1.1

  First, I installed Cygwin64bit and added ’make’, ’dos2unix’, ’c++ gcc’ packages. And I decompressed ffmpeg folder in C :/android-ndk-r11c/sources. This is the build script I used.

  config.sh

  #!/bin/bash
  
  NDK=C:/android-ndk-r11c
  
  SYSROOT=$NDK/platforms/android-9/arch-arm/
  
  TOOLCHAIN=$NDK/toolchains/arm-linux-androideabi-4.9/prebuilt/windows-x86_64
  
  
  
  #I used cygpath to avoid path errors in Cygwin. 
  
  
  
  CUR="$(cygpath -m "$(pwd)")" 
  
  TEMPDIR="$(cygpath -m "/tmp")"
  
  TMP="$(cygpath -m "/tmp")"
  
  TMPDIR="$(cygpath -m "/tmp")"
  
  CPU=arm
  
  PREFIX=$CUR/android/$CPU 
  
  ADDI_CFLAGS="-marm"
  
  
  
  ./configure 
  
      --prefix=$PREFIX 
  
      --enable-shared 
  
      --disable-static 
  
      --disable-doc 
  
      --disable-ffmpeg 
  
      --disable-ffplay 
  
      --disable-ffprobe 
  
      --disable-ffserver 
  
      --disable-doc 
  
      --disable-symver 
  
      --enable-protocol=concat
  
      --enable-protocol=file
  
      --enable-muxer=mp4
  
      --enable-demuxer=mpegts
  
      --enable-memalign-hack
  
      --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

  I ran this .sh in Cygwin(as administrator) but it didn’t work. So I typed each of those lines on Cygwin and it compiled successfully. I tried both --target-os=android and --target-os=linux, but both didn’t solve the problem above.

  Then I followed this tutorial (enoent.fr/blog/2014/06/20/compile-ffmpeg-for-android/). Based on that, I made a native method in my project and built header file and c file.(To do that, I followed this video. youtube.com/watch ?v=kFtxo7rr2HQ)

  After that, I cloned this repo(github.com/HikoQiu/JNI_INVOKE_FFMPEG) and copied - pasted the jni folder into my project. And after making the Android.mk and Application.mk, I ran the C :/android-ndk-r11c/ndk-build.cmd in the Android Studio terminal and it gave me the error above.

  These are the Makefiles I used.

  myProject/app/src/main/jni/Android.mk

  LOCAL_PATH := $(call my-dir)
  
  include $(CLEAR_VARS)
  
  LOCAL_MODULE    := com_example_project_Videokit
  
  LOCAL_LDLIBS := -llog -ljnigraphics -lz
  
  LOCAL_CFLAGS := -Wdeprecated-declarations
  
  ANDROID_LIB := -landroid
  
  LOCAL_C_INCLUDES := C:\android-ndk-r11c\sources\ffmpeg-3.0.2
  
  LOCAL_SRC_FILES := com_example_project_Videokit.c ffmpeg.c ffmpeg_filter.c ffmpeg_opt.c cmdutils.c
  
  LOCAL_SHARED_LIBRARIES := libavformat libavcodec libswscale libavutil
  
  include $(BUILD_SHARED_LIBRARY)
  
  $(call import-module,ffmpeg-3.0.2/android/arm)

  myProject/app/src/main/jni/Application.mk

  APP_ABI := all

  C :/android-ndk-r11c/sources/ffmpeg-3.0.2/android/arm/Android.mk

  LOCAL_PATH:= $(call my-dir)
  
  
  
  include $(CLEAR_VARS)
  
  LOCAL_MODULE:= libavcodec
  
  LOCAL_SRC_FILES:= lib/libavcodec-57.so
  
  LOCAL_EXPORT_C_INCLUDES := $(LOCAL_PATH)/include
  
  include $(PREBUILT_SHARED_LIBRARY)
  
  
  
  include $(CLEAR_VARS)
  
  LOCAL_MODULE:= libavformat
  
  LOCAL_SRC_FILES:= lib/libavformat-57.so
  
  LOCAL_EXPORT_C_INCLUDES := $(LOCAL_PATH)/include
  
  include $(PREBUILT_SHARED_LIBRARY)
  
  
  
  include $(CLEAR_VARS)
  
  LOCAL_MODULE:= libswscale
  
  LOCAL_SRC_FILES:= lib/libswscale-4.so
  
  LOCAL_EXPORT_C_INCLUDES := $(LOCAL_PATH)/include
  
  include $(PREBUILT_SHARED_LIBRARY)
  
  
  
  include $(CLEAR_VARS)
  
  LOCAL_MODULE:= libavutil
  
  LOCAL_SRC_FILES:= lib/libavutil-55.so
  
  LOCAL_EXPORT_C_INCLUDES := $(LOCAL_PATH)/include
  
  include $(PREBUILT_SHARED_LIBRARY)
  
  
  
  include $(CLEAR_VARS)
  
  LOCAL_MODULE:= libavfilter
  
  LOCAL_SRC_FILES:= lib/libavfilter-6.so
  
  LOCAL_EXPORT_C_INCLUDES := $(LOCAL_PATH)/include
  
  include $(PREBUILT_SHARED_LIBRARY)
  
  
  
  include $(CLEAR_VARS)
  
  LOCAL_MODULE:= libwsresample
  
  LOCAL_SRC_FILES:= lib/libswresample-2.so
  
  LOCAL_EXPORT_C_INCLUDES := $(LOCAL_PATH)/include
  
  include $(PREBUILT_SHARED_LIBRARY)

  And this is my project structure so far. com_example_myProjct.c is the file that I used as a moduleName in build.gradle file and as LOCAL_MODULE in Android.mk .

  app
  
   - build
  
   - libs
  
   - src
  
     - androidTest
  
     - main
  
       - java
  
          -com.example.myProject
  
            -MainActivity
  
            -Videokit   //this is the class where I called the native method.
  
       - jni
  
          -Android.mk
  
          -Application.mk
  
          -cmdutils.c
  
          -cmdutils.h
  
          -com_example_myProject.c
  
          -com_example_myProject.h
  
          -ffmpeg.c
  
          -ffmpeg.h
  
          -ffmpeg_filter.c
  
          -ffmpeg_opt.c
  
          -ffmpeg_opt.h
  
          -logjam.h
  
     - obj
  
     - res
  
     AndroidManifest.xml
  
   - test 

  app/gradle.build

  apply plugin: 'com.android.application'
  
  
  
  android {
  
      compileSdkVersion 23
  
      buildToolsVersion "23.0.2"
  
  
  
      defaultConfig {
  
          applicationId "com.example.myProjct"
  
          minSdkVersion 14
  
          targetSdkVersion 23
  
          versionCode 1
  
          versionName "1.0.0"
  
  
  
          ndk {
  
              moduleName "com_example_myProjet_Videokit"
  
          }
  
          sourceSets.main {
  
              jni.srcDirs = []
  
              jniLibs.srcDir 'src/main/libs'
  
          }
  
      }
  
  
  
      buildTypes {
  
          release {
  
              minifyEnabled false
  
              proguardFiles getDefaultProguardFile('proguard-rules.txt'), 'proguard-rules.pro'
  
          }
  
      }
  
  }
  
  
  
  dependencies {
  
      compile fileTree(dir: 'libs', include: ['*.jar'])
  
      testCompile 'junit:junit:4.12'
  
      compile 'com.android.support:appcompat-v7:23.4.0'
  
  }

  Any ideas ?

• I can't seem to install opencv2.4.13 for Python3.4 on Mac El Capitan

  1er juin 2016, par ThatProgrammerDude

  This has been driving me nuts. I have been working on this non stop for a week. I have looked at many tutorials online they did not help.

  I have tried so much I don’t even remember what I tried. I can say the last thing I tried though.. which is this video https://www.youtube.com/watch?v=U49CVY8yOxw.

  So I download opencv2.4.13, create the build folder, open cmake, configure, generate and then go to terminal and type in make.

  I get this :

  Richie's Macbook Air:build Richie$ make
  
  [  2%] Built target zlib
  
  [  6%] Built target libtiff
  
  [ 10%] Built target libjpeg
  
  [ 14%] Built target libjasper
  
  [ 16%] Built target libpng
  
  [ 23%] Built target IlmImf
  
  [ 26%] Built target opencv_core
  
  [ 31%] Built target opencv_imgproc
  
  [ 32%] Built target opencv_video
  
  [ 32%] Built target opencv_flann
  
  [ 32%] Building CXX object modules/highgui/CMakeFiles/opencv_highgui.dir/src/cap_ffmpeg.cpp.o
  
  In file included from /Users/Richie/Downloads/opencv-2.4.13/modules/highgui/src/cap_ffmpeg.cpp:45:
  
  /Users/Richie/Downloads/opencv-2.4.13/modules/highgui/src/cap_ffmpeg_impl.hpp:71:6: error: 
  
        "libswscale is necessary to build the newer OpenCV ffmpeg wrapper"
  
      #error "libswscale is necessary to build the newer OpenCV ffmpeg wrapper"
  
       ^
  
  /Users/Richie/Downloads/opencv-2.4.13/modules/highgui/src/cap_ffmpeg_impl.hpp:481:9: error: 
  
        use of undeclared identifier 'sws_freeContext'
  
          sws_freeContext(img_convert_ctx);
  
          ^
  
  /Users/Richie/Downloads/opencv-2.4.13/modules/highgui/src/cap_ffmpeg_impl.hpp:965:17: error: 
  
        use of undeclared identifier 'SWS_BICUBIC'
  
                  SWS_BICUBIC,
  
                  ^
  
  /Users/Richie/Downloads/opencv-2.4.13/modules/highgui/src/cap_ffmpeg_impl.hpp:998:5: error: 
  
        use of undeclared identifier 'sws_scale'
  
      sws_scale(
  
      ^
  
  /Users/Richie/Downloads/opencv-2.4.13/modules/highgui/src/cap_ffmpeg_impl.hpp:1639:46: error: 
  
        use of undeclared identifier 'SWS_BICUBIC'
  
                                               SWS_BICUBIC,
  
                                               ^
  
  /Users/Richie/Downloads/opencv-2.4.13/modules/highgui/src/cap_ffmpeg_impl.hpp:1645:14: error: 
  
        use of undeclared identifier 'sws_scale'
  
          if ( sws_scale(img_convert_ctx, input_picture->data,
  
               ^
  
  /Users/Richie/Downloads/opencv-2.4.13/modules/highgui/src/cap_ffmpeg_impl.hpp:1693:9: error: 
  
        use of undeclared identifier 'sws_freeContext'
  
          sws_freeContext(img_convert_ctx);
  
          ^
  
  /Users/Richie/Downloads/opencv-2.4.13/modules/highgui/src/cap_ffmpeg_impl.hpp:2290:9: warning: 
  
        ignoring return value of function declared with warn_unused_result
  
        attribute [-Wunused-result]
  
          avformat_write_header(oc_, NULL);
  
          ^~~~~~~~~~~~~~~~~~~~~ ~~~~~~~~~
  
  1 warning and 7 errors generated.
  
  make[2]: *** [modules/highgui/CMakeFiles/opencv_highgui.dir/src/cap_ffmpeg.cpp.o] Error 1
  
  make[1]: *** [modules/highgui/CMakeFiles/opencv_highgui.dir/all] Error 2
  
  make: *** [all] Error 2
  
  Richie's Macbook Air:build Richie$ 

  From what I can see, it says

  "libswscale is necessary to build the newer OpenCV ffmpeg wrapper"

  I have tried googling though to no avail, does anyone know ?

  EDIT : I do have ffmpeg installed... (brew).

• FFMPEG merge two .mp4 videos - resolution distorted

  9 juin 2016, par Misha Moryachok

  I am trying to merge two .mp4 videos, and in some cases the seconds video part is distorted in the output video. Providing an example below :
  https://www.youtube.com/watch?v=wWMNTBWJ37A

  The real video is : https://www.youtube.com/watch?v=ASio-j-Epi8

  As you can see, we added intro before the real content, however, the real content is stretched.
  In my opinion it happens because first video is 1280x720 and the second is 460x720.

  Providing commands for merging videos :

  *1st step (convert the videos from .mp4 to .ts)

   ffmpeg -i videoPathMP4 -c copy -bsf:v h264_mp4toannexb -f mpegts videoPathTS

  *2nd step (merge videos)

  ffmpeg -i "concat:$video1 | $video2" -c copy -bsf:a aac_adtstoasc $meagePathMP4

  Video output is like you saw in provided videolink on youtube.
  I also tried to change the first video resolution to be like the second video :

  ffmpeg -i inputVideo.mp4 -s 460x720 outputVideo.mp4

  However it doesn’t helped.
  Is anyone know how to solve this ?
  Thanks