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• Cross device h264 compatible html5 video

  26 juin 2021, par mikkelam

  I'm trying to serve a large video of timelapses generated from a series of images.
  
Using FFmpeg I have encoded the video as an h264 mp4.

  


  ffmpeg -framerate 24 -i "/app/download/%d.jpeg" -c:v libx264 -crf 23 -preset fast -tune animation -report -vf "format=yuv420p" -y /app/output.mp4


  


  I'm running into compatibility issues where the videos are not playable on iOS (safari) as well as on Windows (all browsers except chrome). Where I'm getting the following error :

  


  Error Code: NS_ERROR_DOM_MEDIA_FATAL_ERR (0x806e0005) Details: mozilla::MediaResult __cdecl mozilla::WMFVideoMFTManager::ValidateVideoInfo(void): Can't decode H.264 stream because its resolution is out of the maximum limitation

  


  See the full FFmpeg log here : https://pastebin.com/QUEPh3q2

  


  I'm just looking for some resource or knowledge of how to encode my media for maximum compatibility while still preserving high quality and resolution.

  


  Problem :
  
Which options I should be using in FFmpeg to maximize compatibility ?

  


• linker error in Android NDK r25c when cross-compiling FFmpeg

  5 août 2023, par Sai Chaithanya

  I am cross compiling FFmpeg for Android(aarch64) using Android NDK r25c on Linux x86_64 platform. The errors generated by the linker are because of enabling the LTO option.
  
On disabling the LTO options(--enable-lto optional config and -flto=thin cc-flag), there are no failures.

  


  FFmpeg config :

  


  ./configure --arch=aarch64 --target-os=android --enable-cross-compile --disable-everything \ 
 --disable-network --disable-autodetect --enable-small --disable-debug --disable-doc \ 
 --disable-manpages --disable-podpages --disable-txtpages --disable-htmlpages --disable-shared \
 --enable-static --enable-decoder='aac*,ac3*,opus,vorbis,mjpeg,mp3' \ 
 --enable-demuxer='mov,m4v,matroska,image2,mp3' --enable-protocol=file --enable-muxer='mp3,mp4,webm,null' \  
 --enable-libmp3lame --enable-encoder=libmp3lame --enable-filter=aresample --enable-logging \ 
 --enable-pthreads --enable-parser='vorbis,opus,vp8,vp9,mjpeg,h264,aac*,ac3*,mpegvideo,mpegaudio,mpeg4video' \
 --disable-ffprobe --disable-ffplay --prefix='$HOME/Downloads/custom_build' --enable-lto \
 --extra-cflags="-I$HOME/Downloads/custom_build/include -I$HOME/Downloads/android-ndk-r25c/toolchains/llvm/prebuilt/linux-x86_64/include -O3 -flto=thin" \
 --extra-ldflags="-L$HOME/Downloads/custom_build/lib -L$HOME/Downloads/android-ndk-r25c/toolchains/llvm/prebuilt/linux-x86_64/lib64" \
 --cc="aarch64-linux-android33-clang" --nm=llvm-nm --strip=llvm-strip


  


  Error :

  


  ld: error: undefined symbol: av_packet_alloc
>>> referenced by ld-temp.o
>>>               lto.tmp:(input_thread)
>>> referenced by ld-temp.o
>>>               lto.tmp:(input_thread)
>>> referenced by ld-temp.o
>>>               lto.tmp:(ifile_open)
>>> referenced 10 more times

ld: error: undefined symbol: av_usleep
>>> referenced by ld-temp.o
>>>               lto.tmp:(input_thread)
>>> referenced by ld-temp.o
>>>               lto.tmp:(main)
>>> referenced by ld-temp.o
>>>               lto.tmp:(retry_transfer_wrapper)

ld: error: undefined symbol: av_log
>>> referenced by ld-temp.o
>>>               lto.tmp:(input_thread)
>>> referenced by ld-temp.o
>>>               lto.tmp:(input_thread)
>>> referenced by ld-temp.o
>>>               lto.tmp:(input_thread)
>>> referenced 745 more times

ld: error: undefined symbol: av_thread_message_queue_send
>>> referenced by ld-temp.o
>>>               lto.tmp:(input_thread)
>>> referenced by ld-temp.o
>>>               lto.tmp:(input_thread)
>>> referenced by ld-temp.o
>>>               lto.tmp:(input_thread)
>>> referenced 1 more times

ld: error: undefined symbol: av_thread_message_queue_recv
>>> referenced by ld-temp.o
>>>               lto.tmp:(input_thread)
>>> referenced by ld-temp.o
>>>               lto.tmp:(main)
>>> referenced by ld-temp.o
>>>               lto.tmp:(ffmpeg_cleanup)

ld: error: undefined symbol: av_rescale_q
>>> referenced by ld-temp.o
>>>               lto.tmp:(input_thread)
>>> referenced by ld-temp.o
>>>               lto.tmp:(input_thread)
>>> referenced by ld-temp.o
>>>               lto.tmp:(ifile_open)
>>> referenced 62 more times

ld: error: undefined symbol: av_packet_move_ref
>>> referenced by ld-temp.o
>>>               lto.tmp:(input_thread)
>>> referenced by ld-temp.o
>>>               lto.tmp:(submit_packet)
>>> referenced by ld-temp.o
>>>               lto.tmp:(pkt_move)
>>> referenced 3 more times

ld: error: undefined symbol: av_thread_message_queue_set_err_recv
>>> referenced by ld-temp.o
>>>               lto.tmp:(input_thread)

ld: error: undefined symbol: av_packet_free
>>> referenced by ld-temp.o
>>>               lto.tmp:(input_thread)
>>> referenced by ld-temp.o
>>>               lto.tmp:(input_thread)
>>> referenced by ld-temp.o
>>>               lto.tmp:(mux_check_init)
>>> referenced 13 more times

ld: error: undefined symbol: av_compare_ts
>>> referenced by ld-temp.o
>>>               lto.tmp:(ifile_duration_update)
>>> referenced by ld-temp.o
>>>               lto.tmp:(finish_stream)
>>> referenced by ld-temp.o
>>>               lto.tmp:(finish_stream)
>>> referenced 10 more times

ld: error: undefined symbol: av_dict_set_int
>>> referenced by ld-temp.o
>>>               lto.tmp:(ifile_open)
>>> referenced by ld-temp.o
>>>               lto.tmp:(of_open)
>>> referenced by ld-temp.o
>>>               lto.tmp:(mov_read_ftyp)
>>> referenced 1 more times

ld: error: undefined symbol: av_dict_get
>>> referenced by ld-temp.o
>>>               lto.tmp:(ifile_open)
>>> referenced by ld-temp.o
>>>               lto.tmp:(configure_filtergraph)
>>> referenced by ld-temp.o
>>>               lto.tmp:(main)
>>> referenced 25 more times

ld: error: undefined symbol: av_opt_set_dict
>>> referenced by ld-temp.o
>>>               lto.tmp:(ifile_open)
>>> referenced by ld-temp.o
>>>               lto.tmp:(ifile_open)
>>> referenced by ld-temp.o
>>>               lto.tmp:(init_output_stream_wrapper)
>>> referenced 4 more times

ld: error: undefined symbol: av_strdup
>>> referenced by ld-temp.o
>>>               lto.tmp:(ifile_open)
>>> referenced by ld-temp.o
>>>               lto.tmp:(ifile_open)
>>> referenced by ld-temp.o
>>>               lto.tmp:(ifile_open)
>>> referenced 29 more times

ld: error: undefined symbol: av_mallocz
>>> referenced by ld-temp.o
>>>               lto.tmp:(ifile_open)
>>> referenced by ld-temp.o
>>>               lto.tmp:(graph_parse)
>>> referenced by ld-temp.o
>>>               lto.tmp:(graph_parse)
>>> referenced 62 more times

ld: error: undefined symbol: av_opt_set_defaults
>>> referenced by ld-temp.o
>>>               lto.tmp:(ifile_open)
>>> referenced by ld-temp.o
>>>               lto.tmp:(avfilter_graph_alloc)
>>> referenced by ld-temp.o
>>>               lto.tmp:(avfilter_graph_alloc_filter)
>>> referenced 5 more times

ld: error: undefined symbol: av_fast_malloc
>>> referenced by ld-temp.o
>>>               lto.tmp:(ifile_open)

ld: error: undefined symbol: av_free
>>> referenced by ld-temp.o
>>>               lto.tmp:(ifile_open)
>>> referenced by ld-temp.o
>>>               lto.tmp:(ifile_open)
>>> referenced by ld-temp.o
>>>               lto.tmp:(ifile_open)
>>> referenced 62 more times

ld: error: undefined symbol: av_freep
>>> referenced by ld-temp.o
>>>               lto.tmp:(ifile_open)
>>> referenced by ld-temp.o
>>>               lto.tmp:(ifile_open)
>>> referenced by ld-temp.o
>>>               lto.tmp:(ifile_open)
>>> referenced 205 more times

ld: error: undefined symbol: av_asprintf
>>> referenced by ld-temp.o
>>>               lto.tmp:(ifile_open)
>>> referenced by ld-temp.o
>>>               lto.tmp:(ifile_open)
>>> referenced by ld-temp.o
>>>               lto.tmp:(describe_filter_link)
>>> referenced 3 more times

ld: error: too many errors emitted, stopping now (use -error-limit=0 to see all errors)
clang-14: error: linker command failed with exit code 1 (use -v to see invocation)
make: *** [Makefile:131: ffmpeg_g] Error 1


  


  I also compiled LAME encoder (version 3.100) with LTO options, and it worked just fine.
  
How to resolve the error ?

  


  **The libLTO.so file is present under lib64/ hence added that to the —extra-ldflags optional config.
  
**PATH env contains $HOME/Downloads/android-ndk-r25c/toolchains/llvm/prebuilt/linux-x86_64/bin

  


• Cross compiling OpenCV with ffmpeg

  24 mai 2019, par Stevan Ognjanovic

  I am trying to cross compile OpenCV 3.2 with ffpmeg from sources for armhf architecture on Ubuntu amd64. I have installed libraries for ffmpeg using

      sudo apt-get install libavcodec-dev:armhf libavformat-dev:armhf libswscale-dev:armhf
  
      sudo apt-get install libjpeg-dev:armhf libpng-dev:armhf libtiff-dev:armhf libjasper-dev:armhf

  After cloning OpenCV from github I ran cmake with following command

      cmake -DENABLE_NEON=ON -DENABLE_VFPV3=ON -DWITH_FFMPEG=ON  -DCMAKE_TOOLCHAIN_FILE=../opencv/platforms/linux/arm-gnueabi.toolchain.cmake ../opencv

  The output shows that all of the installed libraries can not be found. I don’t know how to resolve this. There are also two folders which store armhf libs /usr/arm-linux-gnueabihf/lib and /usr/lib/arm-linux-gnueabihf so I am not sure if cmake is looking in the right directory and how to change that. Toolchain files look like this

  arm-gnueabi.toolchain.cmake

      set(GCC_COMPILER_VERSION "" CACHE STRING "GCC Compiler version")
  
      set(GNU_MACHINE "arm-linux-gnueabi" CACHE STRING "GNU compiler triple")
  
      include("${CMAKE_CURRENT_LIST_DIR}/arm.toolchain.cmake")

  arm.toolchain.cmake

  if(COMMAND toolchain_save_config)
  
    return() # prevent recursive call
  
  endif()
  
  
  
  set(CMAKE_SYSTEM_NAME Linux)
  
  set(CMAKE_SYSTEM_VERSION 1)
  
  if(NOT DEFINED CMAKE_SYSTEM_PROCESSOR)
  
    set(CMAKE_SYSTEM_PROCESSOR arm)
  
  else()
  
    #message("CMAKE_SYSTEM_PROCESSOR=${CMAKE_SYSTEM_PROCESSOR}")
  
  endif()
  
  
  
  include("${CMAKE_CURRENT_LIST_DIR}/gnu.toolchain.cmake")
  
  
  
  if(CMAKE_SYSTEM_PROCESSOR STREQUAL arm AND NOT ARM_IGNORE_FP)
  
    set(FLOAT_ABI_SUFFIX "")
  
    if(NOT SOFTFP)
  
      set(FLOAT_ABI_SUFFIX "hf")
  
    endif()
  
  endif()
  
  
  
  if(NOT "x${GCC_COMPILER_VERSION}" STREQUAL "x")
  
    set(__GCC_VER_SUFFIX "-${GCC_COMPILER_VERSION}")
  
  endif()
  
  
  
  if(NOT DEFINED CMAKE_C_COMPILER)
  
    find_program(CMAKE_C_COMPILER NAMES ${GNU_MACHINE}${FLOAT_ABI_SUFFIX}-gcc${__GCC_VER_SUFFIX})
  
  else()
  
    #message(WARNING "CMAKE_C_COMPILER=${CMAKE_C_COMPILER} is defined")
  
  endif()
  
  if(NOT DEFINED CMAKE_CXX_COMPILER)
  
    find_program(CMAKE_CXX_COMPILER NAMES ${GNU_MACHINE}${FLOAT_ABI_SUFFIX}-g++${__GCC_VER_SUFFIX})
  
  else()
  
    #message(WARNING "CMAKE_CXX_COMPILER=${CMAKE_CXX_COMPILER} is defined")
  
  endif()
  
  if(NOT DEFINED CMAKE_LINKER)
  
    find_program(CMAKE_LINKER NAMES ${GNU_MACHINE}${FLOAT_ABI_SUFFIX}-ld${__GCC_VER_SUFFIX} ${GNU_MACHINE}${FLOAT_ABI_SUFFIX}-ld)
  
  else()
  
    #message(WARNING "CMAKE_LINKER=${CMAKE_LINKER} is defined")
  
  endif()
  
  if(NOT DEFINED CMAKE_AR)
  
    find_program(CMAKE_AR NAMES ${GNU_MACHINE}${FLOAT_ABI_SUFFIX}-ar${__GCC_VER_SUFFIX} ${GNU_MACHINE}${FLOAT_ABI_SUFFIX}-ar)
  
  else()
  
    #message(WARNING "CMAKE_AR=${CMAKE_AR} is defined")
  
  endif()
  
  
  
  if(NOT DEFINED ARM_LINUX_SYSROOT AND DEFINED GNU_MACHINE)
  
    set(ARM_LINUX_SYSROOT /usr/lib/${GNU_MACHINE}${FLOAT_ABI_SUFFIX})
  
  endif()
  
  
  
  if(NOT DEFINED CMAKE_CXX_FLAGS)
  
    set(CMAKE_CXX_FLAGS           "" CACHE INTERAL "")
  
    set(CMAKE_C_FLAGS             "" CACHE INTERAL "")
  
    set(CMAKE_SHARED_LINKER_FLAGS "" CACHE INTERAL "")
  
    set(CMAKE_MODULE_LINKER_FLAGS "" CACHE INTERAL "")
  
    set(CMAKE_EXE_LINKER_FLAGS    "" CACHE INTERAL "")
  
  
  
    set(CMAKE_CXX_FLAGS           "${CMAKE_CXX_FLAGS} -fdata-sections -Wa,--noexecstack -fsigned-char -Wno-psabi")
  
    set(CMAKE_C_FLAGS             "${CMAKE_C_FLAGS} -fdata-sections -Wa,--noexecstack -fsigned-char -Wno-psabi")
  
    if(CMAKE_SYSTEM_PROCESSOR STREQUAL arm)
  
      set(CMAKE_CXX_FLAGS           "-mthumb ${CMAKE_CXX_FLAGS}")
  
      set(CMAKE_C_FLAGS             "-mthumb ${CMAKE_C_FLAGS}")
  
      set(CMAKE_EXE_LINKER_FLAGS    "${CMAKE_EXE_LINKER_FLAGS} -Wl,-z,nocopyreloc")
  
    endif()
  
    if(CMAKE_SYSTEM_PROCESSOR STREQUAL arm)
  
      set(ARM_LINKER_FLAGS "-Wl,--fix-cortex-a8 -Wl,--no-undefined -Wl,--gc-sections -Wl,-z,noexecstack -Wl,-z,relro -Wl,-z,now")
  
    elseif(CMAKE_SYSTEM_PROCESSOR STREQUAL aarch64)
  
      set(ARM_LINKER_FLAGS "-Wl,--no-undefined -Wl,--gc-sections -Wl,-z,noexecstack -Wl,-z,relro -Wl,-z,now")
  
    endif()
  
    set(CMAKE_SHARED_LINKER_FLAGS "${ARM_LINKER_FLAGS} ${CMAKE_SHARED_LINKER_FLAGS}")
  
    set(CMAKE_MODULE_LINKER_FLAGS "${ARM_LINKER_FLAGS} ${CMAKE_MODULE_LINKER_FLAGS}")
  
    set(CMAKE_EXE_LINKER_FLAGS    "${ARM_LINKER_FLAGS} ${CMAKE_EXE_LINKER_FLAGS}")
  
  else()
  
    #message(WARNING "CMAKE_CXX_FLAGS='${CMAKE_CXX_FLAGS}' is defined")
  
  endif()
  
  
  
  if(USE_NEON)
  
    message(WARNING "You use obsolete variable USE_NEON to enable NEON instruction set. Use -DENABLE_NEON=ON instead." )
  
    set(ENABLE_NEON TRUE)
  
  elseif(USE_VFPV3)
  
    message(WARNING "You use obsolete variable USE_VFPV3 to enable VFPV3 instruction set. Use -DENABLE_VFPV3=ON instead." )
  
    set(ENABLE_VFPV3 TRUE)
  
  endif()
  
  
  
  set(CMAKE_FIND_ROOT_PATH ${CMAKE_FIND_ROOT_PATH} ${ARM_LINUX_SYSROOT})
  
  
  
      if(EXISTS ${CUDA_TOOLKIT_ROOT_DIR})
  
        set(CMAKE_FIND_ROOT_PATH ${CMAKE_FIND_ROOT_PATH} ${CUDA_TOOLKIT_ROOT_DIR})
  
      endif()
  
  
  
      set(TOOLCHAIN_CONFIG_VARS ${TOOLCHAIN_CONFIG_VARS}
  
          ARM_LINUX_SYSROOT
  
          ENABLE_NEON
  
          ENABLE_VFPV3
  
          CUDA_TOOLKIT_ROOT_DIR
  
      )
  
      toolchain_save_config()