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• Insert still frames into H.264 video stream

  7 juillet 2021, par Bassinator

  I'm building an application that receives video packets which are encoded as H.264 from Microsoft Teams - I get one packet for each frame of video. Specifications of the packet contents are given here. For every packet I receive, I write the byte contents of the data[] buffer to a file. This resulting file is a playable H.264 encoded video.

  


  I'm trying to handle the scenario of syncing the audio and video streams from a Teams meeting, and inserting a still frame PNG as a "filler" when nobody has their camera on.

  


  I used the following FFMPEG command to generate n number of seconds of H.264 video from the filler frame :

  


  ffmpeg -loop 1 -i video_filler_frame.png -framerate 30 -c:v libx264 -t 2 -vf scale=1920:1080 C:\Code\temp\out.mp4


  


  This generates an MP4 file (H.264 encoded) - as a test in my code, I tried to read the contents of that generated file as a byte array and append them to the video file.

  


  However, this doesn't appear to work. I'm guessing this is because there is some kind of header or other metadata that prevents us from doing the simple solution of just appending the bytes of the next frame.

  


  My question is, how can I achieve what I am trying to do ? I'd like to splice in n number of frames as I am writing the individual packet contents to the file. In other words, for example, consider the following sequence :

  


  

  • Write packets of video to the file

  


  • My code determines that filler frames are needed at some point in this process

    

    • Insert needed number of filler frames to the file

    


    


  


  • Continue writing packets of video as they come in

  


  


• Anomalie #3750 : Itérateur JSON, erreur de compilation lorsque la source contient &

  8 octobre 2018, par placido .

  J’avais fait le ticket au départ, notamment parce que le message de debug de compilation partait complètement en vrille, ce qui semble trahir un cas de remontée d’erreur pas bien géré.
  Pour le reste on a qu’à dire que cette page fera office de précis de documentation pour les urls de ressources JSON avec ’&’.

  Donc oui, on peut sans doute fermer.

• vcpkg error : BUILD_FAILED when "Getting CMake variables for x64-windows"

  24 août 2024, par Rok Benko

  I'm trying to install ffmpeg via vcpkg on Windows by running the following command :

  


  vcpkg.exe install ffmpeg

  


  The installation throws an error when getting CMake variables for x64-windows.

  


  -- Getting CMake variables for x64-windows
CMake Error at scripts/cmake/vcpkg_execute_required_process.cmake:127 (message):
    Command failed: "C:/Program Files/Microsoft Visual Studio/2022/Community/Common7/IDE/CommonExtensions/Microsoft/CMake/Ninja/ninja.exe" -v
    Working Directory: C:/Users/xxxxx/vcpkg/buildtrees/pkgconf/x64-windows-rel/vcpkg-parallel-configure
    Error code: 1
    See logs for more information:
      C:\Users\xxxxx\vcpkg\buildtrees\pkgconf\cmake-get-vars-x64-windows-dbg-CMakeCache.txt.log
      C:\Users\xxxxx\vcpkg\buildtrees\pkgconf\cmake-get-vars-x64-windows-rel-CMakeCache.txt.log
      C:\Users\xxxxx\vcpkg\buildtrees\pkgconf\cmake-get-vars-x64-windows-dbg-CMakeConfigureLog.yaml.log
      C:\Users\xxxxx\vcpkg\buildtrees\pkgconf\cmake-get-vars-x64-windows-rel-CMakeConfigureLog.yaml.log
      C:\Users\xxxxx\vcpkg\buildtrees\pkgconf\cmake-get-vars-x64-windows-out.log

Call Stack (most recent call first):
  installed/x64-windows/share/vcpkg-cmake/vcpkg_cmake_configure.cmake:269 (vcpkg_execute_required_process)
  installed/x64-windows/share/vcpkg-cmake-get-vars/vcpkg_cmake_get_vars.cmake:15 (vcpkg_cmake_configure)
  installed/x64-windows/share/vcpkg-tool-meson/vcpkg_configure_meson.cmake:323 (vcpkg_cmake_get_vars)
  installed/x64-windows/share/vcpkg-tool-meson/vcpkg_configure_meson.cmake:458 (vcpkg_generate_meson_cmd_args)
  ports/pkgconf/portfile.cmake:9 (vcpkg_configure_meson)
  scripts/ports.cmake:192 (include)


error: building pkgconf:x64-windows failed with: BUILD_FAILED
See https://learn.microsoft.com/vcpkg/troubleshoot/build-failures?WT.mc_id=vcpkg_inproduct_cli for more information.
Elapsed time to handle pkgconf:x64-windows: 1.9 s
Please ensure you're using the latest port files with `git pull` and `vcpkg update`.
Then check for known issues at:
  https://github.com/microsoft/vcpkg/issues?q=is%3Aissue+is%3Aopen+in%3Atitle+pkgconf
You can submit a new issue at:
  https://github.com/microsoft/vcpkg/issues/new?title=xxxxx


  


  What does this error mean ? The suggested git pull and vcpkg update didn't solve the error. The directory is up to date.

  


  PS : I opened logs, but I have no idea how to solve the error. I don't understand them.