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  • build : Fine-grained link-time dependency settings

    22 janvier 2017, par Diego Biurrun
    build : Fine-grained link-time dependency settings

    Previously, all link-time dependencies were added for all libraries,
    
resulting in bogus link-time dependencies since not all dependencies
    
are shared across libraries. Also, in some cases like libavutil, not
    
all dependencies were taken into account, resulting in some cases of
    
underlinking.
    

    To address all this mess a machinery is added for tracking which
    
dependency belongs to which library component and then leveraged
    
to determine correct dependencies for all individual libraries.
    • [DBH] Makefile
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  • 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.

  • Cant link against ffmpeg static build

    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.
    Here is a file tree :

    distribution
    
├── libavcodec
    
│   ├── lib
    
│   │   └── x86
    
│   │       └── libavcodec.a
    
│   ├── avcodec.h
    
│   └── version.h
    
├── libavfilter
    
│   ├── lib
    
│   │   └── x86
    
│   │       └── libavfilter.a
    
│   ├── avfiltergraph.h
    
│   └── avfilter.h
    
├── libavformat
    
│   ├── lib
    
│   │   └── x86
    
│   │       └── libavformat.a
    
│   ├── avformat.h
    
│   ├── avio.h
    
│   └── version.h
    
├── libavutil
    
│   ├── lib
    
│   │   └── x86
    
│   │       └── libavutil.a
    
│   ├── attributes.h
    
│   ├── avconfig.h
    
│   ├── avutil.h
    
│   ├── buffer.h
    
│   ├── buffer_internal.h
    
│   ├── camellia.h
    
│   ├── cast5.h
    
│   ├── channel_layout.h
    
│   ├── colorspace.h
    
│   ├── color_utils.h
    
│   ├── common.h
    
│   ├── cpu.h
    
│   ├── cpu_internal.h
    
│   ├── crc.h
    
│   ├── des.h
    
│   ├── dict.h
    
│   ├── display.h
    
│   ├── downmix_info.h
    
│   ├── dynarray.h
    
│   ├── error.h
    
│   ├── eval.h
    
│   ├── ffmath.h
    
│   ├── ffversion.h
    
│   ├── fifo.h
    
│   ├── file.h
    
│   ├── fixed_dsp.h
    
│   ├── float_dsp.h
    
│   ├── frame.h
    
│   ├── hash.h
    
│   ├── hmac.h
    
│   ├── hwcontext_cuda.h
    
│   ├── hwcontext_cuda_internal.h
    
│   ├── hwcontext_dxva2.h
    
│   ├── hwcontext.h
    
│   ├── hwcontext_internal.h
    
│   ├── hwcontext_qsv.h
    
│   ├── hwcontext_vaapi.h
    
│   ├── hwcontext_vdpau.h
    
│   ├── imgutils.h
    
│   ├── integer.h
    
│   ├── internal.h
    
│   ├── intfloat.h
    
│   ├── intmath.h
    
│   ├── intreadwrite.h
    
│   ├── lfg.h
    
│   ├── libm.h
    
│   ├── lls.h
    
│   ├── log.h
    
│   ├── lzo.h
    
│   ├── macros.h
    
│   ├── mastering_display_metadata.h
    
│   ├── mathematics.h
    
│   ├── md5.h
    
│   ├── mem.h
    
│   ├── mem_internal.h
    
│   ├── motion_vector.h
    
│   ├── murmur3.h
    
│   ├── opencl.h
    
│   ├── opencl_internal.h
    
│   ├── opt.h
    
│   ├── parseutils.h
    
│   ├── pca.h
    
│   ├── pixdesc.h
    
│   ├── pixelutils.h
    
│   ├── pixfmt.h
    
│   ├── qsort.h
    
│   ├── random_seed.h
    
│   ├── rational.h
    
│   ├── rc4.h
    
│   ├── replaygain.h
    
│   ├── reverse.h
    
│   ├── ripemd.h
    
│   ├── samplefmt.h
    
│   ├── sha512.h
    
│   ├── sha.h
    
│   ├── softfloat.h
    
│   ├── softfloat_ieee754.h
    
│   ├── softfloat_tables.h
    
│   ├── spherical.h
    
│   ├── stereo3d.h
    
│   ├── tablegen.h
    
│   ├── tea.h
    
│   ├── thread.h
    
│   ├── threadmessage.h
    
│   ├── timecode.h
    
│   ├── time.h
    
│   ├── time_internal.h
    
│   ├── timer.h
    
│   ├── timestamp.h
    
│   ├── tree.h
    
│   ├── twofish.h
    
│   └── version.h
    
└── libswresample
    
    ├── lib
    
    │   └── x86
    
    │       └── libswresample.a
    
    ├── swresample.h
    
    └── swresample_internal.h

    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}
    
                          )
    

    

    
target_link_libraries( 
    
                       native-lib
    

    
                       lib_avcodec
    
                       lib_avfilter
    
                       lib_avformat
    
                       lib_avutil
    
                       lib_swresample
    
                        )

    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 ?

    Error :

    [2/2] 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-16/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  -llog ../../../../../distribution/libavcodec/lib/x86/libavcodec.a ../../../../../distribution/libavfilter/lib/x86/libavfilter.a ../../../../../distribution/libavformat/lib/x86/libavformat.a ../../../../../distribution/libavutil/lib/x86/libavutil.a ../../../../../distribution/libswresample/lib/x86/libswresample.a -lm "D:/AndroidSDK/ndk-bundle/sources/cxx-stl/gnu-libstdc++/4.9/libs/x86/libgnustl_static.a" && cd ."
    
src/libavformat/allformats.c:51: error: undefined reference to 'avcodec_register_all'
    
  src/libavformat/id3v2.c:1009: error: undefined reference to 'uncompress'
    
  src/libavformat/id3v2.c:1153: error: undefined reference to 'av_init_packet'
    
  src/libavformat/matroskadec.c:1393: error: undefined reference to 'inflateInit_'
    
  src/libavformat/matroskadec.c:1408: error: undefined reference to 'inflate'
    
  src/libavformat/matroskadec.c:1401: error: undefined reference to 'inflateEnd'
    
  src/libavformat/matroskadec.c:1411: error: undefined reference to 'inflateEnd'
    
  src/libavformat/matroskadec.c:3113: error: undefined reference to 'av_new_packet'
    
  src/libavformat/matroskadec.c:3134: error: undefined reference to 'av_packet_new_side_data'
    
  src/libavformat/matroskadec.c:2855: error: undefined reference to 'av_new_packet'
    
  src/libavformat/matroskadec.c:3147: error: undefined reference to 'av_packet_new_side_data'
    
  src/libavformat/matroskadec.c:3022: error: undefined reference to 'av_new_packet'
    
  src/libavformat/matroskadec.c:3031: error: undefined reference to 'av_packet_new_side_data'
    
  src/libavformat/matroskadec.c:3042: error: undefined reference to 'av_packet_new_side_data'
    
  src/libavformat/matroskadec.c:3151: error: undefined reference to 'av_packet_unref'
    
  src/libavformat/matroskadec.c:2680: error: undefined reference to 'av_packet_unref'
    
  src/libavformat/matroskadec.c:963: error: undefined reference to 'av_fast_padded_malloc'
    
  src/libavformat/matroskadec.c:2163: error: undefined reference to 'av_get_codec_tag_string'
    
  src/libavformat/matroskadec.c:2680: error: undefined reference to 'av_packet_unref'
    
  src/libavformat/matroskadec.c:2579: error: undefined reference to 'av_init_packet'
    
  src/libavformat/matroskadec.c:2580: error: undefined reference to 'av_new_packet'
    
  src/libavformat/matroskadec.c:1715: error: undefined reference to 'avpriv_mpeg4audio_sample_rates'
    
  src/libavformat/matroskadec.c:1715: error: undefined reference to 'avpriv_mpeg4audio_sample_rates'
    
  src/libavformat/matroskadec.c:1715: error: undefined reference to 'avpriv_mpeg4audio_sample_rates'
    
  src/libavformat/matroskadec.c:1866: error: undefined reference to 'avcodec_chroma_pos_to_enum'
    
  src/libavformat/matroskadec.c:2680: error: undefined reference to 'av_packet_unref'
    
  src/libavformat/matroskaenc.c:2482: error: undefined reference to 'avcodec_get_type'
    
  src/libavformat/matroskaenc.c:646: error: undefined reference to 'avpriv_split_xiph_headers'
    
  src/libavformat/matroskaenc.c:1066: error: undefined reference to 'av_get_bits_per_sample'
    
  src/libavformat/matroskaenc.c:723: error: undefined reference to 'avpriv_mpeg4audio_get_config'
    
  src/libavformat/matroskaenc.c:875: error: undefined reference to 'avcodec_enum_to_chroma_pos'
    
  src/libavformat/matroskaenc.c:813: error: undefined reference to 'avcodec_get_name'
    
  src/libavformat/matroskaenc.c:806: error: undefined reference to 'avcodec_get_name'
    
  src/libavformat/matroskaenc.c:824: error: undefined reference to 'avcodec_get_name'
    
  .....

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