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• How do I properly link ffmpeg using CMake in my Flutter plugin on Linux ?

  7 avril 2022, par GroovinChip

  I've written a Flutter plugin for Linux that uses ffmpeg and I'm having trouble building my example app that uses the plugin. I keep getting errors that there are no matching calls to several ffmpeg functions, which I can actually click into and see. Why is this happening and what can I do to fix it ?

  


  Here is my plugin's CMakeLists.txt :

  


  cmake_minimum_required(VERSION 3.10)
set(PROJECT_NAME "thumblr_linux")
project(${PROJECT_NAME} LANGUAGES CXX)

# This value is used when generating builds using this plugin, so it must
# not be changed
set(PLUGIN_NAME "thumblr_linux_plugin")

add_subdirectory(FFmpeg)

add_library(${PLUGIN_NAME} SHARED
  "thumblr_linux_plugin.cc"
)
apply_standard_settings(${PLUGIN_NAME})
set_target_properties(${PLUGIN_NAME} PROPERTIES
  CXX_VISIBILITY_PRESET hidden)
target_compile_definitions(${PLUGIN_NAME} PRIVATE FLUTTER_PLUGIN_IMPL)
target_include_directories(${PLUGIN_NAME} INTERFACE
  "${CMAKE_CURRENT_SOURCE_DIR}/include")
target_link_libraries(${PLUGIN_NAME} PRIVATE flutter)
target_link_libraries(${PLUGIN_NAME} PRIVATE PkgConfig::GTK FFmpgeg)

# List of absolute paths to libraries that should be bundled with the plugin
set(thumblr_linux_bundled_libraries
  ""
  PARENT_SCOPE
)


  


  and here is my FFmpeg/CMakeLists.txt :

  


  cmake_minimum_required(VERSION 3.14)
project(FFmpeg)

find_package(PkgConfig REQUIRED)
pkg_check_modules(AVCODEC     REQUIRED IMPORTED_TARGET libavcodec)
pkg_check_modules(AVFORMAT    REQUIRED IMPORTED_TARGET libavformat)
pkg_check_modules(AVFILTER    REQUIRED IMPORTED_TARGET libavfilter)
pkg_check_modules(AVDEVICE    REQUIRED IMPORTED_TARGET libavdevice)
pkg_check_modules(AVUTIL      REQUIRED IMPORTED_TARGET libavutil)
pkg_check_modules(SWRESAMPLE  REQUIRED IMPORTED_TARGET libswresample)
pkg_check_modules(SWSCALE     REQUIRED IMPORTED_TARGET libswscale)

add_library(FFmpeg INTERFACE IMPORTED GLOBAL)

target_link_libraries(FFmpeg INTERFACE
    PkgConfig::AVCODEC
    PkgConfig::AVFORMAT
    PkgConfig::AVFILTER
    PkgConfig::AVDEVICE
    PkgConfig::AVUTIL
    PkgConfig::SWRESAMPLE
    PkgConfig::SWSCALE
)


  


  and here are the error messages I get when building :

  


  /home/parallels/flutter_projects/thumblr/thumblr_linux/example/linux/flutter/ephemeral/.plugin_symlinks/thumblr_linux/linux/thumblr_linux_plugin.cc:80:9: error: no matching function for call to 'avformat_open_input'
/home/parallels/flutter_projects/thumblr/thumblr_linux/example/linux/flutter/ephemeral/.plugin_symlinks/thumblr_linux/linux/thumblr_linux_plugin.cc:84:9: error: no matching function for call to 'avformat_find_stream_info'
/home/parallels/flutter_projects/thumblr/thumblr_linux/example/linux/flutter/ephemeral/.plugin_symlinks/thumblr_linux/linux/thumblr_linux_plugin.cc:88:5: error: no matching function for call to 'av_dump_format'
/home/parallels/flutter_projects/thumblr/thumblr_linux/example/linux/flutter/ephemeral/.plugin_symlinks/thumblr_linux/linux/thumblr_linux_plugin.cc:102:61: error: assigning to 'AVCodecContext *' from incompatible type 'AVCodecParameters *'
/home/parallels/flutter_projects/thumblr/thumblr_linux/example/linux/flutter/ephemeral/.plugin_symlinks/thumblr_linux/linux/thumblr_linux_plugin.cc:111:9: error: use of undeclared identifier 'avcodec_open'
/home/parallels/flutter_projects/thumblr/thumblr_linux/example/linux/flutter/ephemeral/.plugin_symlinks/thumblr_linux/linux/thumblr_linux_plugin.cc:119:14: error: use of undeclared identifier 'avcodec_alloc_frame'
/home/parallels/flutter_projects/thumblr/thumblr_linux/example/linux/flutter/ephemeral/.plugin_symlinks/thumblr_linux/linux/thumblr_linux_plugin.cc:122:17: error: use of undeclared identifier 'avcodec_alloc_frame'
/home/parallels/flutter_projects/thumblr/thumblr_linux/example/linux/flutter/ephemeral/.plugin_symlinks/thumblr_linux/linux/thumblr_linux_plugin.cc:127:16: error: no matching function for call to 'atk_image_get_image_size'
/home/parallels/flutter_projects/thumblr/thumblr_linux/example/linux/flutter/ephemeral/.plugin_symlinks/thumblr_linux/linux/thumblr_linux_plugin.cc:133:5: error: use of undeclared identifier 'av_image_fill_arrays'
/home/parallels/flutter_projects/thumblr/thumblr_linux/example/linux/flutter/ephemeral/.plugin_symlinks/thumblr_linux/linux/thumblr_linux_plugin.cc:144:9: error: use of undeclared identifier 'avcodec_decode_video'
/home/parallels/flutter_projects/thumblr/thumblr_linux/example/linux/flutter/ephemeral/.plugin_symlinks/thumblr_linux/linux/thumblr_linux_plugin.cc:179:15: error: unused variable 'ret' [-Werror,-Wunused-variable]
/home/parallels/flutter_projects/thumblr/thumblr_linux/example/linux/flutter/ephemeral/.plugin_symlinks/thumblr_linux/linux/thumblr_linux_plugin.cc:211:5: error: no matching function for call to 'avformat_close_input'


  


  the C++ code for the plugin itself can be found here : https://github.com/GroovinChip/thumblr/blob/main/thumblr_linux/linux/thumblr_linux_plugin.cc

  


• vulkan : add support for encode and decode queues and refactor queue code

  7 novembre 2021, par Lynne

  vulkan : add support for encode and decode queues and refactor queue code
  This simplifies and makes queue family picking simpler and more robust.
  
  The requirements on the device context are relaxed. They made no sense
  
  in the first place.
  The video encode/decode extension is still in beta, at least on paper,
  
  but I really doubt they'd change needing a separate queue family.
  

  • [DH] libavfilter/vf_avgblur_vulkan.c
  • [DH] libavfilter/vf_chromaber_vulkan.c
  • [DH] libavfilter/vf_overlay_vulkan.c
  • [DH] libavfilter/vf_scale_vulkan.c
  • [DH] libavfilter/vulkan.h
  • [DH] libavutil/hwcontext_vulkan.c
  • [DH] libavutil/hwcontext_vulkan.h

• FFmpeg "Could not open file" error message when processing with PHP

  22 juin 2022, par FlyingCat

  I am using ffmpeg to get the image from several video files. I got my ffmpeg codes ready but I got the following error when I exec my codes.

  



  ffmpeg version 0.8.6-4:0.8.6-0ubuntu0.12.04.1, Copyright (c) 2000-2013 the Libav developers
built on Apr  2 2013 17:02:36 with gcc 4.6.3

*** THIS PROGRAM IS DEPRECATED ***
This program is only provided for compatibility and will be removed in a future release. Please use avconv instead.
//files info...
//files info...
Incompatible pixel format 'yuv420p' for codec 'mjpeg', auto-selecting format 'yuvj420p'
//file info...
[buffer @ 0x1513c40] Buffering several frames is not supported. Please consume all available frames before adding a new one.
 Last message repeated 75 times
[image2 @ 0x1513460] Could not open file : /test/project
av_interleaved_write_frame(): Input/output error


  



  I only show the error messages that have color highlighted. 
My code :

  



   $ffmpeg ="/usr/bin/ffmpeg";

 $image_source_path = '/test/project/test.mp4';
 $ALL_PLACE_WIDTH = 300;
 $ALL_PLACE_HEIGHT = 300;

 $image_cmd = " -r 1 -ss 00:00:10 -t 00:00:01 -s ".$ALL_PLACE_WIDTH."x".$ALL_PLACE_HEIGHT."   -f image2 " ;

 $dest_image_path = '/test/project';

 $str_command= $ffmpeg  ." -i " . $image_source_path . $image_cmd .$dest_image_path;
 shell_exec($str_command);


  



  It seems my Linux wants to me to switch to avconv. I am not sure how to fix these errors. Can someone give me a hint about it ?