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• Building FFMPEG with Android Project

  19 avril 2017, par Contextioner

  I have generated ffmpeg binaries and setup NDK with my Android Studio I have also generated static files of ffmpeg. I am new with Android NDK I need help with building ffmpeg with my Android Project can anyone guide me to do so.

  Here is the of the generated files.

  This is my Android.mk file.

  LOCAL_PATH := $(call my-dir)
  
  include $(CLEAR_VARS)
  
  LOCAL_C_INCLUDES := $(ANDROID_NDK)/sources/ffmpeg-3.3
  
  LOCAL_CFLAGS := -Os -fpic -marm -march=armv7-a -mfloat-abi=softfp -mfpu=neon
  
  LOCAL_MODULE := MyFFmpeg
  
  LOCAL_SRC_FILES := arm/videoKit.c arm/ffmpeg.c arm/ffmpeg_filter.c arm/ffmpeg_opt.c arm/cmdutils.c
  
  LOCAL_STATIC_LIBRARIES := libavdevice libavformat libavfilter libavcodec libavutil libswresample libswscale
  
  include $(BUILD_SHARED_LIBRARY)
  
  $(call import-module,ffmpeg-2.2.3/android/arm)

• How to reduce conversion/compression time in FFmpeg and How to merge command ?

  18 mai 2017, par Patel Pinkal

  I want to reduce time taken to create new video after adding text in original video using FFmpeg
  I had tried to search and I found this code given below for reducing time.

   -y -i /sdcard/videokit/in.mp4 -strict experimental -vcodec libx264 -preset ultrafast -crf 24 -acodec aac -ar 44100 -ac 2 -b 36000k -s 1280x720 -aspect 16:9 -metadata:s:v:0 rotate=0 /sdcard/videokit/out3.mp4

  Now, I want to add text in video and it is done in FFmpeg, by this command and its 100% working.

    String[] addTextCommand = {
  
              "-i",
  
              "" + realFilePath,
  
              "-vf",
  
              "drawtext=fontsize=50:fontfile=/storage/emulated/0/Download/Cerbetica-regular.ttf:fontcolor=red:text='"
  
                      + strText +
  
                      "':x=0:y=0: box=1: boxcolor=black@0.5:boxborderw=10: x=0: y=(h-text_h)/2",
  
              "-strict",
  
              "-2",
  
              outputFilePath};

  Now my problem is how do I merge this two code and make one single command to make an edited video and also take less time to create a new video. In this, I have tried this command but it’s not working.

     String[] addTextCommand = {
  
              "-i",
  
              "" + realVideoPath,
  
              "-vf",
  
              "-c:v", "libx264",
  
              "-preset", "ultrafast",
  
              "-crf", "24",
  
              "-acodec", "aac",
  
              "-ar", "44100",
  
              "-ac", "2",
  
              "-b", "36000k",
  
              "-s", "1280x720",
  
              "-aspect", "16:9",
  
              "-metadata:s:v:0 rotate=0",
  
              "drawtext=fontsize=50:fontfile=/storage/emulated/0/Download/Cerbetica-regular.ttf:fontcolor=red:text='"
  
                      + strText +
  
                      "':x=0:y=0: box=1: boxcolor=black@0.5:boxborderw=10: x=0: y=(h-text_h)/2",
  
              "-strict",
  
              "-2",
  
              outputFilePath};

  If anyone has an idea how to make command of FFmpeg please describe it and explain how to use it.

  Using command of @Mulvya I got this in the console.

       D/MainActivity: FAILED with output : WARNING: linker: /data/user/0/com.inheritx.videoprocessing/files/ffmpeg has text relocations. This is wasting memory and prevents security hardening. Please fix.
  
                     ffmpeg version n3.0.1 Copyright (c) 2000-2016 the FFmpeg developers
  
                       built with gcc 4.8 (GCC)
  
                       configuration: --target-os=linux --cross-prefix=/home/vagrant/SourceCode/ffmpeg-android/toolchain-android/bin/i686-linux-android- --arch=x86 --cpu=i686 --enable-runtime-cpudetect --sysroot=/home/vagrant/SourceCode/ffmpeg-android/toolchain-android/sysroot --enable-pic --enable-libx264 --enable-libass --enable-libfreetype --enable-libfribidi --enable-libmp3lame --enable-fontconfig --enable-pthreads --disable-debug --disable-ffserver --enable-version3 --enable-hardcoded-tables --disable-ffplay --disable-ffprobe --enable-gpl --enable-yasm --disable-doc --disable-shared --enable-static --pkg-config=/home/vagrant/SourceCode/ffmpeg-android/ffmpeg-pkg-config --prefix=/home/vagrant/SourceCode/ffmpeg-android/build/x86 --extra-cflags='-I/home/vagrant/SourceCode/ffmpeg-android/toolchain-android/include -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=2 -fno-strict-overflow -fstack-protector-all -march=i686' --extra-ldflags='-L/home/vagrant/SourceCode/ffmpeg-android/toolchain-android/lib -Wl,-z,relro -Wl,-z,now -pie' --extra-libs='-lpng -lexpat -lm' --extra-cxxflags=
  
                       libavutil      55. 17.103 / 55. 17.103
  
                       libavcodec     57. 24.102 / 57. 24.102
  
                       libavformat    57. 25.100 / 57. 25.100
  
                       libavdevice    57.  0.101 / 57.  0.101
  
                       libavfilter     6. 31.100 /  6. 31.100
  
                       libswscale      4.  0.100 /  4.  0.100
  
                       libswresample   2.  0.101 /  2.  0.101
  
                       libpostproc    54.  0.100 / 54.  0.100
  
                     Unrecognized option '2'.
  
                     Error splitting the argument list: Option not found
  
     D/MainActivity: Finished command : ffmpeg -i
  
     D/MainActivity: Finished command : ffmpeg /storage/emulated/0/Download/spacetestSMALL_512kb.mp4
  
     D/MainActivity: Finished command : ffmpeg -vf
  
     D/MainActivity: Finished command : ffmpeg drawtext=fontsize=50:fontfile=/system/fonts/DroidSans.ttf:fontcolor=red:text='Hello':x=0:y=0: box=1: boxcolor=black@0.5:boxborderw=10: x=0: y=(h-text_h)/2
  
     D/MainActivity: Finished command : ffmpeg -c:v
  
     D/MainActivity: Finished command : ffmpeg libx264
  
     D/MainActivity: Finished command : ffmpeg -preset
  
     D/MainActivity: Finished command : ffmpeg ultrafast
  
     D/MainActivity: Finished command : ffmpeg -crf
  
     D/MainActivity: Finished command : ffmpeg 24
  
     D/MainActivity: Finished command : ffmpeg -acodec
  
     D/MainActivity: Finished command : ffmpeg aac
  
     D/MainActivity: Finished command : ffmpeg -ar
  
     D/MainActivity: Finished command : ffmpeg 44100
  
     D/MainActivity: Finished command : ffmpeg -s
  
     D/MainActivity: Finished command : ffmpeg 1280x720
  
     D/MainActivity: Finished command : ffmpeg -aspect
  
     D/MainActivity: Finished command : ffmpeg 16:9
  
     D/MainActivity: Finished command : ffmpeg -metadata:s:v:0 rotate=0
  
     D/MainActivity: Finished command : ffmpeg -strict
  
     D/MainActivity: Finished command : ffmpeg -2
  
     D/MainActivity: Finished command : ffmpeg /storage/emulated/0/Movies/add_text25.mp4

• avcodec_find_encoder(AV_CODEC_ID_H264) returns null

  25 mai, par Monjura Rumi

  I am building an android application which will encode image captured from camera preview and later decode it. I am using ffmpeg library to encode and decode. To build static library with x264 I have used this tutorial. http://dl.dropbox.com/u/22605641/ffmpeg_android/main.html. As a source code of ffmpeg if I use the one downloaded from the link given in tutorial I can built it but can't build library if i use source code downloaded from here git clone git ://source.ffmpeg.org/ffmpeg.git ffmpeg. I have built library in ubuntu and using it in windows 7 in Eclipse. As I need only h264 encoder and decoder I have used following code for ffmpeg, slightly modified from tutorial.

  



  #!/bin/bash

NDK=~/Documents/android-ndk-r8e
PLATFORM=$NDK/platforms/android-8/arch-arm
PREBUILT=$NDK/toolchains/arm-linux-androideabi-4.4.3/prebuilt/linux-x86
PREFIX=/home/android-ffmpeg

function build_one
{
    ./configure --target-os=linux --prefix=$PREFIX \
    --enable-cross-compile \
    --enable-runtime-cpudetect \
    --disable-asm \
    --arch=arm \
    --cc=$PREBUILT/bin/arm-linux-androideabi-gcc \
    --cross-prefix=$PREBUILT/bin/arm-linux-androideabi- \
    --disable-stripping \
    --nm=$PREBUILT/bin/arm-linux-androideabi-nm \
    --sysroot=$PLATFORM \
    --enable-nonfree \
    --enable-version3 \
    --disable-everything \
    --enable-gpl \
    --disable-doc \
    --enable-avresample \
    --disable-ffplay \
    --disable-ffserver \
    --enable-ffmpeg \
    --disable-ffprobe \
    --enable-avcodec \
    --enable-libx264 \
    --enable-encoder=libx264 \
    --enable-encoder=libx264rgb \
    --enable-decoder=h263 \
    --enable-decoder=h264 \
    --enable-decoder=svq3 \   
    --enable-zlib \
    --enable-gpl \
    --enable-pic \
    --disable-devices \
    --disable-avdevice \
    --extra-cflags="-I/home/android-ffmpeg/include -fPIC -DANDROID -D__thumb__ -mthumb -Wfatal-errors -Wno-deprecated -mfloat-abi=softfp -mfpu=vfpv3-d16 -marm -march=armv7-a" \
    --extra-ldflags="-L/home/android-ffmpeg/lib"
make -j4 install
$PREBUILT/bin/arm-linux-androideabi-ar d libavcodec/libavcodec.a inverse.o
$PREBUILT/bin/arm-linux-androideabi-ld -rpath-link=$PLATFORM/usr/lib -L$PLATFORM/usr/lib -L$PREFIX/lib  -soname libffmpeg.so -shared -nostdlib  -z,noexecstack -Bsymbolic --whole-archive --no-undefined -o $PREFIX/libffmpeg.so libavcodec/libavcodec.a libavfilter/libavfilter.a libavresample/libavresample.a libavformat/libavformat.a libavutil/libavutil.a libswscale/libswscale.a -lc -lm -lz -ldl -llog -lx264 --warn-once --dynamic-linker=/system/bin/linker $PREBUILT/lib/gcc/arm-linux-androideabi/4.4.3/libgcc.a
}

build_one


  



  After building library I have been able to build android ndk. A little part of my JNI code is here.

  



  JNIEXPORT jint JNICALL Java_com_example_testjava_TestjniActivity_initencoder(JNIEnv* env,jobject obj){

    av_register_all();
    avcodec_register_all();
    codec = avcodec_find_encoder(AV_CODEC_ID_H264);
    if (!codec) {
      __android_log_write(ANDROID_LOG_INFO, "debug", "not found");                
       return -1;
    }
.
.
.
}


  



  When I run my java source code that calls initencoder() I get -1 as return value and logcat prints "not found". That means avcodec_find_encoder() returns null and if condition is being ok. I don't know what's wrong. Why this function is returning null ? I have searched a lot but did not find any solution that could guide me to right direction. some says to use avcodec_init(). But ndk-build command fails and shows error saying undefined reference to 'avcodec_init()'. I have started with library build because I thought may be I am doing wrong from the first stage. Did I make any mistake in library building like not enabling things that I should ? Please help me here. This is kind of urgent for me.