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• Convert WMV to mp4 using ffmpeg get Black screen

  16 mars 2015, par HawkEye000

  When converting an .wmv file to .mp4 i used this command :

  exec("ffmpeg -i file.wmv -vcodec mpeg4 -acodec libfaac -b 1200 -r 15 -s 320x240 -pix_fmt yuv420p file.mp4") ;

  Sound is fine but i have no image (using html5 not when downloaded to pc) .
  this is the outputs :

  FFmpeg version 0.6.5, Copyright (c) 2000-2010 the FFmpeg developers
  
    built on Jan 29 2012 17:52:15 with gcc 4.4.5 20110214 (Red Hat 4.4.5-6)
  
    configuration: --prefix=/usr --libdir=/usr/lib64 --shlibdir=/usr/lib64 --mandir=/usr/share/man --incdir=/usr/include --disable-avisynth --extra-cflags='-O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector --param=ssp-buffer-size=4 -m64 -mtune=generic -fPIC' --enable-avfilter --enable-avfilter-lavf --enable-libdc1394 --enable-libdirac --enable-libfaac --enable-libfaad --enable-libfaadbin --enable-libgsm --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-librtmp --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-libx264 --enable-gpl --enable-nonfree --enable-postproc --enable-pthreads --enable-shared --enable-swscale --enable-vdpau --enable-version3 --enable-x11grab
  
    libavutil     50.15. 1 / 50.15. 1
  
    libavcodec    52.72. 2 / 52.72. 2
  
    libavformat   52.64. 2 / 52.64. 2
  
    libavdevice   52. 2. 0 / 52. 2. 0
  
    libavfilter    1.19. 0 /  1.19. 0
  
    libswscale     0.11. 0 /  0.11. 0
  
    libpostproc   51. 2. 0 / 51. 2. 0
  
  [wmv3 @ 0xc2daa0]Extra data: 8 bits left, value: 20
  
  
  
  Seems stream 1 codec frame rate differs from container frame rate: 1000.00 (1000/1) -> 30.00 (30/1)
  
  Input #0, asf, from '/home/xxx/public_html/new/zawmju.wmv':
  
    Metadata:
  
      Application     : Windows Movie Maker 2.6.4037.0
  
      WM/ParentalRating: 
  
      WMFSDKVersion   : 12.0.9200.16384
  
      WMFSDKNeeded    : 0.0.0.0000
  
      IsVBR           : 0
  
      title           : 
  
      author          : SahlaTube
  
      copyright       : 
  
      comment         : 
  
    Duration: 00:00:04.03, start: 2.000000, bitrate: 740 kb/s
  
      Stream #0.0: Audio: wmav2, 44100 Hz, 2 channels, s16, 64 kb/s
  
      Stream #0.1: Video: wmv3, yuv420p, 640x480, 30 tbr, 1k tbn, 1k tbc
  
  [wmv3 @ 0xc2daa0]Extra data: 8 bits left, value: 20
  
  Output #0, mp4, to '/home/xxx/public_html/new/zawmju.wmv.mp4':
  
    Metadata:
  
      encoder         : Lavf52.64.2
  
      Stream #0.0: Video: mpeg4, yuv420p, 320x240, q=2-31, 1 kb/s, 15 tbn, 15 tbc
  
      Stream #0.1: Audio: libfaac, 44100 Hz, 2 channels, s16, 64 kb/s
  
  Stream mapping:
  
    Stream #0.1 -> #0.0
  
    Stream #0.0 -> #0.1
  
  Press [q] to stop encoding
  
  frame=   61 fps=  0 q=24.8 Lsize=      82kB time=4.02 bitrate= 166.4kbits/s dup=0 drop=59    
  
  
  
  video:55kB audio:24kB global headers:0kB muxing overhead 3.828952%

• Mix 2 mp3 files with FFmpeg for Android

  24 mai 2017, par Thankgod Richard

  I am developing something similar to a karaoke app. I have a sound file(beat) and a recorded file(voice) from android mediarecorder. I am trying to mix the two files to become one file that plays the same time. I have set up ffmpeg provided by writingminds and everything is working fine. I am not familiar with ffmpeg commands so searched for and got few commands that can achieve the task for me. This is the code i got :

    String files = "-i " + currentFile + " -i " + someFile.getAbsolutePath();
  
              String output = mFileName + "/recorded/test.mp3";
  
              String cmd = "ffmpeg "+files+
  
                      " -filter_complex \"aevalsrc=0:d=10[s1];[s1][1:a]concat=n=2:v=0:a=1[ac1];[0:a][ac1]amix[aout]\" -map [aout] -c:a libmp3lame " + output;

  But it not working. this is the error i got :

  04-01 12:09:26.598 21300-21300/com.shixels.thankgodrichard.mixer I/fpeg: 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/arm-linux-androideabi- --arch=arm --cpu=cortex-a8 --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/armeabi-v7a --extra-cflags='-I/home/vagrant/SourceCode/ffmpeg-android/toolchain-android/include -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=2 -fno-strict-overflow -fstack-protector-all' --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
  
                                                                           Output #0, mp3, to 'ffmpeg -i /storage/emulated/0/MyStudio/temps/1491044929409.mp3 -i /storage/emulated/0/temp.mp3 -filter_complex "aevalsrc=0:d=10[s1];[s1][1:a]concat=n=2:v=0:a=1[ac1];[0:a][ac1]amix[aout]" -map [aout] -c:a libmp3lame /storage/emulated/0/recorded/test.mp3':
  
                                                                           Output file #0 does not contain any stream
  
  04-01 12:09:26.599 21300-21300/com.shixels.thankgodrichard.mixer I/fpeg: finished

  I read some answers here saying it depends on the version of the ffmpeg your using. I am using the latest ffmpeg for android by writingminds.

• Cant link against ffmpeg with openssl using cmake

  24 mars 2017, par David Barishev

  I have build ffmpeg libraries statically for x86 android using a custom configuration.Now i wanted to add them in my android project.

  Im using ffmpeg 3.2.git, android studio 2.3.

  I created a folder named distribution which had my binaries, and the minimum headers i needed for it to not tell me about missing header (Except for the avutil- i just included them all), located the root of my project.
  I edited my cmake to include the libraries :

  add_library(
  
           native-lib
  
           SHARED
  
           src/main/cpp/native-lib.cpp )
  
  
  
  set(distribution_DIR ${CMAKE_SOURCE_DIR}/../distribution)
  
  
  
  add_library(lib_avcodec STATIC IMPORTED)
  
  set_target_properties(lib_avcodec PROPERTIES IMPORTED_LOCATION
  
      ${distribution_DIR}/libavcodec/lib/${ANDROID_ABI}/libavcodec.a)
  
  
  
  add_library(lib_avfilter STATIC IMPORTED)
  
  set_target_properties(lib_avfilter PROPERTIES IMPORTED_LOCATION
  
      ${distribution_DIR}/libavfilter/lib/${ANDROID_ABI}/libavfilter.a)
  
  
  
  add_library(lib_avformat STATIC IMPORTED)
  
  set_target_properties(lib_avformat PROPERTIES IMPORTED_LOCATION
  
      ${distribution_DIR}/libavformat/lib/${ANDROID_ABI}/libavformat.a)
  
  
  
  add_library(lib_avutil STATIC IMPORTED)
  
  set_target_properties(lib_avutil PROPERTIES IMPORTED_LOCATION
  
      ${distribution_DIR}/libavutil/lib/${ANDROID_ABI}/libavutil.a)
  
  
  
  add_library(lib_swresample STATIC IMPORTED)
  
  set_target_properties(lib_swresample PROPERTIES IMPORTED_LOCATION
  
      ${distribution_DIR}/libswresample/lib/${ANDROID_ABI}/libswresample.a)
  
  
  
  
  
  include_directories(
  
                            ${distribution_DIR}
  
                            )
  
  
  
  find_library( # Sets the name of the path variable.
  
            z-lib
  
  
  
            # Specifies the name of the NDK library that
  
            # you want CMake to locate.
  
            z )
  
  
  
  target_link_libraries( 
  
                     native-lib
  
  
  
                     ${z-lib}
  
  
  
                     lib_crypto
  
                     lib_ssl
  
  
  
                     lib_avfilter
  
                     lib_avformat
  
                     lib_avcodec
  
                     lib_swresample
  
  
  
                     lib_avutil
  
  
  
                      )

  I also restricted the build to only x86, in my app build.gradle :

  ndk {
  
              // Specifies the ABI configurations of your native
  
              // libraries Gradle should build and package with your APK.
  
              abiFilters 'x86'
  
      }

  The project gradle sync worked successfully.
  I wrote the following code in my cpp file :

  #include 
  
  
  
  
  
  extern "C"{
  
      #include "libavformat/avformat.h"
  
  }
  
  JNIEXPORT void JNICALL
  
  Java_com_example_david_testffmpegcpp_MainActivity_stringFromJNI(
  
          JNIEnv *env,
  
          jobject /* this */) {
  
  
  
      av_register_all ();
  
      avformat_network_init ();
  
  
  
  
  
  }

  Just to check if the library works, but i cant seem to link against the libraries correctly. It complains about undefined symbols.
  What did i do wrong ?

  EDIT :

  I changed the order of the linked libraries, and was able to remove all error for ffmpeg’s library functions not found, and i added zlib,that removed some more.

  The only error left are those how are related to openssl, its logical since i compiled my ffmpeg libraries with openssl.

  I tried linking my openssl static libraries that i used for compiling ffmpeg like this :

  set(ssl_dir ${CMAKE_SOURCE_DIR}/../../../FFmpegBuild/Openssl/output_19/android)
  
  
  
  add_library(lib_ssl STATIC IMPORTED)
  
  set_target_properties(lib_ssl PROPERTIES IMPORTED_LOCATION
  
      ${ssl_dir}/openssl-${ANDROID_ABI}/lib/libssl.a)
  
  
  
  add_library(lib_crypto STATIC IMPORTED)
  
  set_target_properties(lib_crypto PROPERTIES IMPORTED_LOCATION
  
      ${ssl_dir}/openssl-${ANDROID_ABI}/lib/libcrypto.a) 
  
  
  
  include_directories(      ${ssl_dir}/openssl-${ANDROID_ABI}/include
  
                            ${distribution_DIR}
  
  
  
                            )

  And linked against them :

  target_link_libraries( # Specifies the target library.
  
                         native-lib
  
  
  
                         ${z-lib}
  
  
  
  
  
                         lib_ssl
  
                         lib_crypto
  
  
  
                         lib_avfilter
  
                         lib_avformat
  
                         lib_avcodec
  
                         lib_swresample
  
  
  
                         lib_avutil
  
  
  
                          )

  But i’m still getting the error that i state below.
  My question is why ? Also if i already built ffmpeg in static mode, how come i need to relink openssl again ?

  Error :

  Error while executing process D:\AndroidSDK\cmake\3.6.3155560\bin\cmake.exe with arguments {--build D:\AndroidApps\TestFFmpegCpp\app\.externalNativeBuild\cmake\debug\x86 --target native-lib}
  
  [1/1] Linking CXX shared library ..\..\..\..\build\intermediates\cmake\debug\obj\x86\libnative-lib.so
  
  FAILED: cmd.exe /C "cd . && D:\AndroidSDK\ndk-bundle\toolchains\llvm\prebuilt\windows-x86_64\bin\clang++.exe  --target=i686-none-linux-android --gcc-toolchain=D:/AndroidSDK/ndk-bundle/toolchains/x86-4.9/prebuilt/windows-x86_64 --sysroot=D:/AndroidSDK/ndk-bundle/platforms/android-19/arch-x86 -fPIC -g -DANDROID -ffunction-sections -funwind-tables -fstack-protector-strong -no-canonical-prefixes -mstackrealign -Wa,--noexecstack -Wformat -Werror=format-security  -g -DANDROID -ffunction-sections -funwind-tables -fstack-protector-strong -no-canonical-prefixes -mstackrealign -Wa,--noexecstack -Wformat -Werror=format-security   -O0 -fno-limit-debug-info -O0 -fno-limit-debug-info  -Wl,--build-id -Wl,--warn-shared-textrel -Wl,--fatal-warnings -Wl,--no-undefined -Wl,-z,noexecstack -Qunused-arguments -Wl,-z,relro -Wl,-z,now -Wl,--build-id -Wl,--warn-shared-textrel -Wl,--fatal-warnings -Wl,--no-undefined -Wl,-z,noexecstack -Qunused-arguments -Wl,-z,relro -Wl,-z,now -shared -Wl,-soname,libnative-lib.so -o ..\..\..\..\build\intermediates\cmake\debug\obj\x86\libnative-lib.so CMakeFiles/native-lib.dir/src/main/cpp/native-lib.cpp.o  -lz ../../../../../../../FFmpegBuild/Openssl/output_19/android/openssl-x86/lib/libcrypto.a ../../../../../../../FFmpegBuild/Openssl/output_19/android/openssl-x86/lib/libssl.a ../../../../../distribution/libavfilter/lib/x86/libavfilter.a ../../../../../distribution/libavformat/lib/x86/libavformat.a ../../../../../distribution/libavcodec/lib/x86/libavcodec.a ../../../../../distribution/libswresample/lib/x86/libswresample.a ../../../../../distribution/libavutil/lib/x86/libavutil.a -lm "D:/AndroidSDK/ndk-bundle/sources/cxx-stl/gnu-libstdc++/4.9/libs/x86/libgnustl_static.a" && cd ."
  
  src/libavformat/tls_openssl.c:125: error: undefined reference to 'BIO_clear_flags'
  
    src/libavformat/tls_openssl.c:102: error: undefined reference to 'BIO_clear_flags'
  
    src/libavformat/tls_openssl.c:116: error: undefined reference to 'BIO_clear_flags'
  
    src/libavformat/tls_openssl.c:116: error: undefined reference to 'BIO_clear_flags'
  
    src/libavformat/tls_openssl.c:309: error: undefined reference to 'SSL_read'
  
    src/libavformat/tls_openssl.c:200: error: undefined reference to 'ERR_get_error'
  
    src/libavformat/tls_openssl.c:200: error: undefined reference to 'ERR_error_string'
  
    src/libavformat/tls_openssl.c:320: error: undefined reference to 'SSL_write'
  
    src/libavformat/tls_openssl.c:200: error: undefined reference to 'ERR_get_error'
  
    src/libavformat/tls_openssl.c:200: error: undefined reference to 'ERR_error_string'
  
    src/libavformat/tls_openssl.c:154: error: undefined reference to 'SSL_library_init'
  
    src/libavformat/tls_openssl.c:155: error: undefined reference to 'SSL_load_error_strings'
  
    src/libavformat/tls_openssl.c:157: error: undefined reference to 'CRYPTO_get_locking_callback'
  
    src/libavformat/tls_openssl.c:159: error: undefined reference to 'CRYPTO_num_locks'
  
    src/libavformat/tls_openssl.c:165: error: undefined reference to 'CRYPTO_num_locks'
  
    src/libavformat/tls_openssl.c:167: error: undefined reference to 'CRYPTO_set_locking_callback'
  
    src/libavformat/tls_openssl.c:186: error: undefined reference to 'CRYPTO_get_locking_callback'
  
    src/libavformat/tls_openssl.c:188: error: undefined reference to 'CRYPTO_set_locking_callback'
  
    src/libavformat/tls_openssl.c:189: error: undefined reference to 'CRYPTO_num_locks'
  
    src/libavformat/tls_openssl.c:208: error: undefined reference to 'SSL_shutdown'
  
    src/libavformat/tls_openssl.c:209: error: undefined reference to 'SSL_free'
  
    src/libavformat/tls_openssl.c:212: error: undefined reference to 'SSL_CTX_free'
  
    src/libavformat/tls_openssl.c:240: error: undefined reference to 'SSLv23_client_method'
  
    src/libavformat/tls_openssl.c:240: error: undefined reference to 'SSL_CTX_new'
  
    src/libavformat/tls_openssl.c:246: error: undefined reference to 'SSL_CTX_ctrl'
  
    src/libavformat/tls_openssl.c:248: error: undefined reference to 'SSL_CTX_load_verify_locations'
  
    src/libavformat/tls_openssl.c:251: error: undefined reference to 'SSL_CTX_use_certificate_chain_file'
  
    src/libavformat/tls_openssl.c:257: error: undefined reference to 'SSL_CTX_use_PrivateKey_file'
  
    src/libavformat/tls_openssl.c:267: error: undefined reference to 'SSL_new'
  
    src/libavformat/tls_openssl.c:284: error: undefined reference to 'BIO_new'
  
    src/libavformat/tls_openssl.c:287: error: undefined reference to 'SSL_set_bio'
  
    src/libavformat/tls_openssl.c:290: error: undefined reference to 'SSL_accept'
  
    src/libavformat/tls_openssl.c:240: error: undefined reference to 'SSLv23_server_method'
  
    src/libavformat/tls_openssl.c:258: error: undefined reference to 'ERR_get_error'
  
    src/libavformat/tls_openssl.c:258: error: undefined reference to 'ERR_error_string'
  
    src/libavformat/tls_openssl.c:208: error: undefined reference to 'SSL_shutdown'
  
    src/libavformat/tls_openssl.c:209: error: undefined reference to 'SSL_free'
  
    src/libavformat/tls_openssl.c:212: error: undefined reference to 'SSL_CTX_free'
  
    src/libavformat/tls_openssl.c:290: error: undefined reference to 'SSL_connect'
  
    src/libavformat/tls_openssl.c:200: error: undefined reference to 'ERR_get_error'
  
    src/libavformat/tls_openssl.c:200: error: undefined reference to 'ERR_error_string'
  
    src/libavformat/tls_openssl.c:266: error: undefined reference to 'SSL_CTX_set_verify'
  
    src/libavformat/tls_openssl.c:289: error: undefined reference to 'SSL_ctrl'
  
    clang++.exe: error: linker command failed with exit code 1 (use -v to see invocation)
  
    ninja: build stopped: subcommand failed.