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• Generate 3gp video file using my image library

  6 novembre 2012, par Turgay Gençer

  I need to generate 3gp video file using images.

  Fore example, I have 3 pictures and I want to put slide time for each pictures and generate 3gp.

  1. Picture = 2 second,
  2. Picture = 3 second,
  3. Picture = 5 second,

  and my 3gp is include 3 pictures.

  İs that the possible to generate 3gp using my pictures library ?

  I m writing in C# .

  Thanks.

• runtime error when linking ffmpeg libraries in qt creator

  6 juillet 2012, par dxthegreat

  I'm quite new around here but i hear that if you want a question answered, stackoverflow is the place to ask it >.<. So i hope that my question isn't too trivial that everyone will get annoyed at my lack of research (I've tried googling for two days already D= no progress !)
  I've also asked this question in the Qt forums, but i figured i'd ask here too.

  so...

  For the last few days I’ve been fiddling around with opengl and the like, trying to write a video player.

  However, when i try to import the ffmpeg libraries (avcodec, avformat, avutils etc), an error occurs on runtime (the program compiles fine). When compiled and run in debug mode, the error message gives me only a memory address and error code 135 (DLL not found).

  This error occurs when i include a function from those libraries in my code (e.g. av_register_all()) and it occurs regardless of whether the function is actually called.

  So i’m thinking that I’m doing something wrong when linking these libraries.
  I’m currently using :
  Windows vista (32bit),
  Qt creator 2.4.1 based on Qt 4.7.4 (32bit),
  Zeranoe’s FFmpeg build git-3233ad4 (2012-06-30)

  My .pro file consists of :

  QT       += core gui opengl
  
  
  
  TARGET = test
  
  TEMPLATE = app
  
  
  
  
  
  SOURCES += main.cpp\
  
          mainwindow.cpp \
  
      glwidget.cpp
  
  
  
  HEADERS += mainwindow.h \
  
      glwidget.h \
  
  
  
  FORMS    += mainwindow.ui
  
  
  
  
  
  LIBS += -L"$$_PRO_FILE_PWD_/libraries/ffmpeg/libs/" -lavcodec -lavformat -lavutil
  
  INCLUDEPATH += libraries/ffmpeg/includes

  I’ve tried many variations to the LIBS += line and checked my filepath many times. However, the DLL not found error occurs in all of these variations =(.

  Is there something I’m forgetting when doing these includes ?

  Thanks in advance >.<,
  (young and naive) aspiring dev

• FFmoeg : What does the source code do when input file is picture ?

  22 août 2022, par Eynnzerr

  As is known, in command lines, FFmpeg can receive pictures as input and output an encoded video, for example,

  &#xA;

  ffmpeg -i ./pictures/%3d.png output.mp4


  &#xA;

  Here I'm curious about what happened in source code, i.e. how FFmpeg reads the pictures and in what format it stores them. I think to get output video, input pictures should first be converted to AVFrame, but I have no idea how to do that. I tried to read the source code of ffmpeg, but it's too hard for me to figure out now.

  &#xA;

  I'd appreciate any helpful advice to solve my question !

  &#xA;