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• Android - Choosing between MediaRecorder, MediaCodec and Ffmpeg

  15 mars 2017, par Rohan Stark

  I am working on a video recording and sharing application for Android. The specifications of the app are as follows :-

  • Recording a 10 second (maximum) video from inside the app (not using the device’s camera app)
  • No further editing on the video
  • Storing the video in a Firebase Cloud Storage (GCS) bucket
  • Downloading and playing of the said video by other users

  From the research, I did on SO and others sources for this, I have found the following (please correct me if I am wrong) :-

  The three options and their respective features are :-

  1.Ffmpeg

  • Capable of achieving the above goal and has extensive answers and explanations on sites like SO, however
  • Increases the APK size by 20-30mb (large library)
  • Runs the risk of not working properly on certain 64-bit devices

  2.MediaRecorder

  • Reliable and supported by most devices
  • Will store files in .mp4 format (unless converted to h264)
  • Easier for playback (no decoding needed)
  • Adds the mp4 and 3gp headers
  • Increases latency according to this question

  3.MediaCodec

  • Low level
  • Will require MediaCodec, MediaMuxer, and MediaExtractor
  • Output in h264 ( without using MediaMuxer for playback )
  • Good for video manipulations (though, not required in my use case)
  • Not supported by pre 4.3 (API 18) devices
  • More difficult to implement and code (my opinion - please correct me if I am wrong)
  • Unavailability of extensive information, tutorials, answers or samples (Bigflake.com being the only exception)

  After spending days on this, I still can’t figure out which approach suits my particular use case. Please elaborate on what I should do for my application. If there’s a completely different approach, then I am open to that as well.

  My biggest criteria are that the video encoding process be as efficient as possible and the video to be stored in the cloud should have the lowest possible space usage without compromising on the video quality.

  Also, I’d be grateful if you could suggest the appropriate format for saving and distributing the video in Firebase Storage, and point me to tutorials or samples of your suggested approach.

  Thank you in advance ! And sorry for the long read.

• ffmpeg stream ip cam from rtsp to http

  15 mars 2017, par mihalp

  I’m trying to restream ip camera from home network to webpage (sort of video player in wordpress). I have rtsp url of camera and i want to have an output in http. It’s bothering me for 2 days now and i’m not sure what i’m missing...
  My ffserver.conf file :

  HTTPPort 8090                      # Port to bind the server to
  
  HTTPBindAddress 0.0.0.0
  
  MaxHTTPConnections 2000
  
  MaxClients 1000
  
  MaxBandwidth 10000             # Maximum bandwidth per client
  
  RTSPPort 8002
  
  
  
                               # set this high enough to exceed stream bitrate
  
  CustomLog -
  
  
  
  <feed>
  
       File /tmp/cam.ffm
  
       FileMaxSize 10G
  
       ACL allow 192.168.0.0 192.168.255.255
  
    </feed>
  
  
  
  
  
  <stream>
  
       Feed cam.ffm
  
       Format mpeg
  
       VideoCodec libx264
  
       VideoSize 1280x720
  
       VideoFrameRate 6
  
       VideoBufferSize 40
  
       AVOptionVideo flags +global_header
  
       PreRoll 15
  
       StartSendOnKey
  
       VideoBitRate 4096
  
       NoAudio
  
  </stream>
  
  
  
  <stream>            # Server status URL
  
     Format status
  
     # Only allow local people to get the status
  
     ACL allow localhost
  
     ACL allow 192.168.0.0 192.168.255.255
  
  </stream>
  
  
  
  <redirect>    # Just an URL redirect for index
  
     # Redirect index.html to the appropriate site
  
     URL url/
  
  </redirect>

  When i enter ffserver -f /etc/ffserver.conf, i get :

  root@test:/tmp# ffserver -f /etc/ffserver.conf
  
  ffserver version 2.6.9 Copyright (c) 2000-2016 the FFmpeg developers
  
    built with gcc 4.9.2 (Debian 4.9.2-10)
  
    configuration: --prefix=/usr --extra-cflags='-g -O2 -fstack-protector-strong -Wformat -Werror=format-security ' --extra-ldflags='-Wl,-z,relro' --cc='ccache cc' --enable-shared --enable-libmp3lame --enable-gpl --enable-nonfree --enable-libvorbis --enable-pthreads --enable-libfaac --enable-libxvid --enable-postproc --enable-x11grab --enable-libgsm --enable-libtheora --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libx264 --enable-libspeex --enable-nonfree --disable-stripping --enable-libvpx --enable-libschroedinger --disable-encoder=libschroedinger --enable-version3 --enable-libopenjpeg --enable-librtmp --enable-avfilter --enable-libfreetype --enable-libvo-aacenc --disable-decoder=amrnb --enable-libvo-amrwbenc --enable-libaacplus --libdir=/usr/lib/x86_64-linux-gnu --disable-vda --enable-libbluray --enable-libcdio --enable-gnutls --enable-frei0r --enable-openssl --enable-libass --enable-libopus --enable-fontconfig --enable-libpulse --disable-mips32r2 --disable-mipsdspr1 --disable-mipsdspr2 --enable-libvidstab --enable-libzvbi --enable-avresample --disable-htmlpages --disable-podpages --enable-libutvideo --enable-libfdk-aac --enable-libx265 --enable-libiec61883 --enable-vaapi --enable-libdc1394 --disable-altivec --shlibdir=/usr/lib/x86_64-linux-gnu
  
    libavutil      54. 20.100 / 54. 20.100
  
    libavcodec     56. 26.100 / 56. 26.100
  
    libavformat    56. 25.101 / 56. 25.101
  
    libavdevice    56.  4.100 / 56.  4.100
  
    libavfilter     5. 11.102 /  5. 11.102
  
    libavresample   2.  1.  0 /  2.  1.  0
  
    libswscale      3.  1.101 /  3.  1.101
  
    libswresample   1.  1.100 /  1.  1.100
  
    libpostproc    53.  3.100 / 53.  3.100
  
  /etc/ffserver.conf:30: Setting default value for video bit rate tolerance = 1024000. Use NoDefaults to disable it.
  
  /etc/ffserver.conf:30: Setting default value for video rate control equation = tex^qComp. Use NoDefaults to disable it.
  
  /etc/ffserver.conf:30: Setting default value for video max rate = 8192000. Use NoDefaults to disable it.
  
  Wed Mar 15 20:23:41 2017 FFserver started.

  and when i enter ffmpeg -i rtsp://<ip of="of" camera="camera">:8002 http://<ip of="of" this="this">:8090/cam.ffm</ip></ip>, happens nothing.

  I can also reach http://<ip of="of" my="my" server="server">:8090/status.html</ip>, but no luck with http://<ip of="of" my="my" server="server">:8090/cam.mpg</ip>.

  Any suggestions ?

  Thank you !

• Compile error for a simple library in Android using latest FFmpeg library with NDK

  21 mars 2017, par satyres

  I’m trying to get FFmpeg working in Android , and after successfuly compiled it on Ubuntu 64bit , and created the Android.mk under source/ffmpeg-3.4.2/android/arm folder and also the Android.mk in my own Android project
   ! i’m unable to compile a simple program and create the .so file !
  By the way i’ve searched over the net and in Stackoverflow for 2 days now without luck !
  here is the code Android.mk

  LOCAL_PATH:= $(call my-dir)
  
  include $(CLEAR_VARS)
  
  LOCAL_MODULE    := MyLibrary
  
  LOCAL_SRC_FILES := MyNativeFunctions.c
  
  LOCAL_LDLIBS := -lz -llog
  
  LOCAL_STATIC_LIBRARIES := libavformat_static libavcodec_static libavutil_static
  
  include $(BUILD_SHARED_LIBRARY)
  
  
  
  $(call import-module,ffmpeg-3.2.4/android/arm)

  The native functions

      #include <libavformat></libavformat>avformat.h>
  
      #include <libavcodec></libavcodec>avcodec.h>
  
      #include <libavutil></libavutil>avutil.h>
  
  
  
      #include <android></android>log.h>
  
      #define LOG_TAG "mylib"
  
      #define LOGI(...)  __android_log_print(ANDROID_LOG_INFO, LOG_TAG, __VA_ARGS__)
  
      #define LOGE(...)  __android_log_print(ANDROID_LOG_ERROR, LOG_TAG, __VA_ARGS__)
  
      jint Java_com_example_home_hellondk_MyNativeFunctions_TestNdk(JNIEnv * env, jobject this, jstring filename)
  
      {
  
           av_register_all();
  
  
  
  return 0;
  
  }

  when i use NDK-BUILD here is the error i got :

  /home/home/Android/Sdk/ndk-bundle/sources/ffmpeg-3.2.4/android/arm/lib/libavformat.a: error adding symbols: File in wrong format
  
  clang++: error: linker command failed with exit code 1 (use -v to see invocation)
  
  make: *** [obj/local/arm64-v8a/libMyLibrary.so] Error 1

  [EDIT]
  Build_android.sh

  #!/bin/bash
  
  NDK=/home/home/Android/Sdk/ndk-bundle
  
  SYSROOT=$NDK/platforms/android-24/arch-arm/
  
  TOOLCHAIN=$NDK/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64
  
   function build_one
  
  {
  
  ./configure \
  
  --prefix=$PREFIX \
  
  --disable-shared \
  
  --enable-static \
  
  --disable-doc \
  
  --disable-ffmpeg \
  
  --disable-ffplay \
  
  --disable-ffprobe \
  
  --disable-ffserver \
  
  --disable-avdevice \
  
  --disable-doc \
  
  --disable-symver \
  
  --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
  
  }
  
  CPU=arm
  
  PREFIX=$(pwd)/android/$CPU
  
  ADDI_CFLAGS="-marm"
  
  build_one

  [EDIT]
  The problem has been solved by adding the missing library in
  LOCAL_STATIC_LIBRARIES := libavformat_static libavcodec_static libswscale_static libavutil_static libswresample_static
  and for all users of Android Studio do not forget to add this line to your gradle otherwise it won’t work.

  sourceSets.main {
  
          jni.srcDirs = []
  
          jniLibs.srcDir 'src/main/libs'
  
      }

  Best regards