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• Flutter ffmpeg kit : Invalid size error when trying to scale video

  27 juillet 2023, par veryepicdude

  I'm trying to resize a video to match instagram's video format requirements. I'm using the ffmpeg_kit_flutter_full_gpl: ^5.1.0 package to do so and this is the function I'm calling :

  


  Future<void> resizeVideo(String input, String output) async {&#xA;&#xA;  final command = &#x27;-i $input -c:v libx264 -aspect 16:9 -crf 18 -vf "scale=iw*min(1280/iw\,720/ih):ih*min(1280/iw\,720/ih),pad=1280:720:(1280-iw)/2:(720-ih)/2" -fpsmax 60 -preset ultrafast -c:a aac -b:a 128k -ac 1 -use_editlist false -ar 48000 -pix_fmt yuv420p -movflags &#x2B;faststart -t 59 -y $output&#x27;;&#xA;  final session = await FFmpegKit.execute(command);&#xA;  print("resize done with ${await session.getReturnCode()}");&#xA;}&#xA;</void>

  


  However I get this error every time :

  


   Stream #0:0[0x1](und): Audio: aac (mp4a / 0x6134706D), 44100 Hz, mono, fltp, 60 kb/s (default)
    Metadata:
      creation_time   : 2023-07-27T15:30:28.000000Z
      handler_name    : Core Media Audio
      vendor_id       : [0][0][0][0]
  Stream #0:1[0x2](und): Video: hevc (hvc1 / 0x31637668), yuv420p(tv, smpte170m/bt709/bt709), 720x1280, 2085 kb/s, 30 fps, 30 tbr, 600 tbn (default)
    Metadata:
      creation_time   : 2023-07-27T15:30:28.000000Z
      handler_name    : Core Media Video
      vendor_id       : [0][0][0][0]
Stream mapping:
  Stream #0:1 -> #0:0 (hevc (native) -> h264 (libx264))
  Stream #0:0 -> #0:1 (aac (native) -> aac (native))
Press [q] to stop, [?] for help
[Parsed_scale_0 @ 0x2834a53f0] Invalid size 'iw*min(1280/iw'
[AVFilterGraph @ 0x28278e3a0] Error initializing filter 'scale'[AVFilterGraph @ 0x28278e3a0]  with args 'iw*min(1280/iw'[AVFilterGraph @ 0x28278e3a0] 
Error reinitializing filters!
Failed to inject frame into filter network: Invalid argument
Error while processing the decoded data for stream #0:1
[aac @ 0x105334290] Qavg: 461.613
[aac @ 0x105334290] 2 frames left in the queue on closing


  


  Removing the scale filter makes the function work fine, but it fails the instagram video requirements listed here.
Any help will be greatly appreciated.

  


• Fatal error reading PNG image file : Invalid IHDR data (gdk-pixbuf-error-quark, 0), when using ffmpeg and wxWidgets

  20 mai 2023, par Dhairya Gupta

  for my C++ project I am using CMake + conan for my project on ubuntu20.04. The config files is as follows

  


  conanfile.py

  


  from conan import ConanFile
from conan.tools.cmake import cmake_layout

class TrajectronRecipe(ConanFile):
    name='trajectron'
    version='0.0.2'

    license = 'GPL3'
    topics = ('gui', 'video', 'interactive')

    settings = ('os', 'compiler', 'build_type', 'arch')
    generators = (
        'CMakeDeps', 
        'CMakeToolchain'
    )

    def requirements(self):
        self.requires('cmake/3.26.3') # build manager
        self.requires('spdlog/1.11.0')  # logger
        self.requires('ffmpeg/5.1')
    
    def build_requirements(self):
        if self.settings.os != 'Windows':
            self.tool_requires("cmake/3.26.3")

    def layout(self):
        # print(f'[settings build] {str(self.settings.build_type)}')
        self.folders.build = f'{str(self.settings.build_type)}'
        self.folders.generators = ''
        # cmake_layout(self)


  


  CMakeLists.txt

  


  cmake_minimum_required(VERSION 3.26 FATAL_ERROR)
set(CXX_STANDARD_REQUIRED ON)
set(CXX_STANDARD 20)
set(CMAKE_CXX_COMPILER /usr/bin/g++-10)
set(CMAKE_CXX_FLAGS "${wxWidgets_CXX_FLAGS}")

project(
    Trajectron
    VERSION 0.0.2
    DESCRIPTION "GUI app to map out trajectories of objects in real time videos"
    LANGUAGES CXX
)
cmake_language(GET_MESSAGE_LOG_LEVEL VERBOSE)

#### external packages
find_package(fmt REQUIRED)
find_package(spdlog REQUIRED)
find_package(wxWidgets REQUIRED gl core base OPTIONAL_COMPONENTS net)
include("${wxWidgets_USE_FILE}")
find_package(ffmpeg REQUIRED)

#### target
add_executable(trajectron 
  main.cpp
  src/app.cpp
  src/base_frame.cpp
  src/sys_file_dir_frame.cpp
  src/panels/video_stage.cpp
  src/panels/control.cpp
  src/panels/frame_list.cpp
  src/events/import_event.cpp
  src/video_processor.cpp
)

target_include_directories(trajectron PRIVATE ${CMAKE_CURRENT_SOURCE_DIR}/include)
target_link_libraries(trajectron PUBLIC spdlog::spdlog)
target_link_libraries(trajectron PUBLIC ffmpeg::ffmpeg)

if(wxWidgets_FOUND)
    target_link_libraries(trajectron PRIVATE ${wxWidgets_LIBRARIES})
else(wxWidgets_FOUND)
    message("wxWidgets not found!")
endif(wxWidgets_FOUND)


  


  when i make the project as follows it build sucessfully with conan and ffmpeg

  


  cmake -G "Unix Makefiles" -S . -B build -DCMAKE_TOOLCHAIN_FILE=dependencies/conan_toolchain.cmake -DCMAKE_BUILD_TYPE=Debug
cd build/
cmake --build


  


  when i run it ./build/trajectron the application launches successfully. But when i click a button to open a wxFilectrl frame, it crashes with the following output
(https://i.stack.imgur.com/YKtfL.png)

  


  **This only happens when i have used ** find_package(ffmpeg REQUIRED) and target_link_libraries(trajectron PUBLIC ffmpeg::ffmpeg) otherwise it works properly.

  


  if you want to see the code for more context : https://github.com/dhairyagupta2603/trajectron

  


  I have tried running the executable for the project using sudo as well as updated the mime database
sudo update-mime-database /usr/share/mime. Note that I am using GTk v3 and have used wxWidgets as a separate install on system as it was not available as a conan package

  


• Scalable Video Stream Processing and Redirection in the Cloud - More Efficient Alternatives to RTMP ?

  18 juillet 2023, par dumbQuestions

  I'm currently working on a project that involves processing and redirecting video streams from multiple users in real time.

  


  Here's how my current implementation works :

  


  


  • Users send their video streams to an RTMP server.

    


  


  • I use OpenCV to connect to the source RTMP server and capture the video stream.
The video frames are processed using OpenCV.

    


  


  • I then use FFmpeg to forward the processed video stream to another RTMP server.

    


  


  


  I want to deploy it with cloud providers, but I'm worried that RTMP servers might not be the best choice for scalability, especially with increasing users. I'm seeking recommendations for efficiently implementing such video stream processing and redirection with good scalability. Is my current implementation somewhat viable, is there a better solution ?

  


  Ideally, I'm looking for solutions that can handle a large number of concurrent video streams and provide low latency

  


  Is there a cloud-based alternative to the RTMP-based approach that can meet these requirements and offer better scalability and efficiency ? Any insights, experiences, or recommendations are greatly appreciated. Thank you !