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• How can I use ffmpeg to generate a video from a sequence of still images that exist in RAM ? [closed]

  16 novembre 2024, par Skittlez McGuillicutty

  I'm aware that I can use an ffmpeg command like

  


  ffmpeg -framerate 60 -i img%d.png -c:v mjpeg -qscale:v 1 output.mp4


  


  Using C++, I want to be able to write image files into RAM (rather than to disk) and generate a video from them.

  


  I tried using memory mapped files but I can't figure out how to pass them into ffmpeg. Most likely what I'm looking for is a solution like tmpfs, but it's also worth noting that I'm doing this on Windows.

  


• How to read errors when compiling from source code

  28 décembre 2022, par slyfox1186

  Goal :

  


  Compile multiple libraries from source code to ultimately install a fully compiled version of FFmpeg with desirable libraries attached.

  


  Problem :

  


  During the compilation, all libraries (seemingly) are successful until liblv2 is reached.

  


  Error output via terminal :

  


  building lv2 - version 1.18.10
=======================
Downloading https://lv2plug.in/spec/lv2-1.18.10.tar.xz as lv2-1.18.10.tar.bz2
... Done
Extracted lv2-1.18.10.tar.bz2
$ python3 ./waf configure --prefix=/home/jman/tmp/ffmpeg/ffmpeg-build/workspace --lv2-user
python3: can't open file '/home/jman/tmp/ffmpeg/ffmpeg-build/packages/lv2-1.18.10/./waf': [Errno 2] No such file or directory

Failed to Execute python3 ./waf configure --prefix=/home/jman/tmp/ffmpeg/ffmpeg-build/workspace --lv2-user


  


  Where I need guidance :

  


  python3: can't open file '/home/jman/tmp/ffmpeg/ffmpeg-build/packages/lv2-1.18.10/./waf': [Errno 2] No such file or directory


  


  My question :

  


  What does this part mean ?

  


  lv2-1.18.10/./waf'

specifically the part /./


  


  My best guess so far is it :

  


  

  1. obviously is looking for a directory it can't find (perhaps because it truly doesn't exist)

  


  2. The missing 'waf' directory should be located inside either the "${PACKAGES}" or "${WORKSPACE}" directory.

  


  


  The ${PACKAGES}" path in this script should = /home/jman/tmp/ffmpeg/ffmpeg-build/packages

  


  The ${WORKSPACE}" path in this script should = /home/jman/tmp/ffmpeg/ffmpeg-build/workspace

  


  The full build script :

  


  https://github.com/slyfox1186/ffmpeg-build-script/blob/master/scripts/build-ffmpeg

  


  I tried my best to make this worth sometimes time without giving too much info... sorry if I don't meet the expectations of this forum.

  


  Am I even close ?

  


• Anomalie #4540 : Accessibilité des boutons radios et checkboxes

  18 février 2021, par cedric -

  je vois même pas le problème dont on parle :
  - le style générique des fieldset s’applique au selecteur fieldset et le style pour le cas specifique des choix s’applique à fieldset.editer voire même simplement à .editer qui est toujours plus fort que fieldset et qui s’applique pas aux fieldset normaux

  Il y a aucun problème de priorité, ajouter une classe sur les fieldset normaux apporte vraiment pas grand chose et par contre ça veut dire que tes styles seront pas compatibles de tous les formulaires qui sont déjà dans la nature.

  Alors que là on ne fait qu’ajouter une possibilité en plus, et tout ce qui existait continue à être rendu exactement pareil, c’est beaucoup plus souple comme transition.