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• batch convert files using ffmpeg and find -exec and parallel

  1er février 2021, par Harvey King

  From another stack exchange post, I came to know that I can batch convert media file with original file name intacted and only change the file extension by using the following

  


  find ./ -name '*.mp4' -exec bash -c 'ffmpeg -i $0 -vn -acodec libmp3lame -ac 2 -ab 160k -ar 48000 ${0/mp4/mp3}' {} \;


  


  Since most computers nowadays have multiple cores, how do I modify the above command, so I can use all 4 cores in the -exec part of find thus I can convert 4 media files at the same time ?

  


  I know GNU parallel can do something similar, but I don't know how to combine them into one single command.

  


  Thanks in advance

  


  Harv

  


• Windows FFMPEG will not find my files at all [migrated]

  22 mars 2014, par user2441247

  I have a folder full of images that go from 0 to whatever number, and I need to turn these images to a video. They are all .PNG files. Here is my command I am using :

  ffmpeg.exe -f image2 -framerate 30 -pattern_type sequence -start_number 1 -r 30 -i "img%%04d.jpg" -s 1280x720 test.avi

  When I run this I get this error :

  [image2 @ 002be580] Could find no file with path 'img%04d.jpg' and index in the range 1-5
  
  
  
  img%04d.jpg: No such file or directory

  What can I change to get this to work ?

• Qt C++ ffmpeg cannot find library

  7 juin 2013, par Carnifrex

  I use Qt 5.0.2 with Mingw 4.7 on windows.

  I'm working on a c++ program and i'm trying to get the duration of video files. I found ffmpeg. Now i tried to compile a simple program but I think it fails with the libraries. I've tried to include both the shared and dev but they both will fail. ( Zeranoe FFmpeg builds)

  This is my pro file :

  TEMPLATE = app
  
  CONFIG += console
  
  CONFIG -= app_bundle
  
  CONFIG -= qt
  
  
  
  SOURCES += main.cpp
  
  
  
  INCLUDEPATH += C:\programming\ffmpeg-20130606-git--win32-shared\bin
  
  
  
  LIBS += -LC:\programming\ffmpeg-20130606-git--win32-shared\bin -lavcodec-55.dll -     lavformat-55.dll -lavutil-52.dll

  i get errors like :

  " :-1 : error : cannot find -lavcodec-55.dll"

  " :-1 : error : cannot find -lavformat-55.dll"

  I've also tried :

  INCLUDEPATH += C:\programming\ffmpeg-20130606-git--win32-dev\include
  
  INCLUDEPATH += C:\programming\ffmpeg-20130606-git--win32-dev\lib
  
  
  
  LIBS += -LC:\programming\ffmpeg-20130606-git--win32-dev\lib -lavcodec -lavformat -lavutil
  
  
  
  LIBS += -LC:\programming\ffmpeg-20130606-git--win32-dev\lib -llibavcodec.dll.a -llibavformat.dll.a -llibavutil.dll.a

  Here it gives a error "During startup program exited with code 0x0000135'

  I even tried to include each library individually. But no results..

  This is my main file :

  #include <iostream>
  
  using namespace std;
  
  extern "C" {
  
    #include <libavcodec></libavcodec>avcodec.h>    // required headers
  
    #include <libavformat></libavformat>avformat.h>
  
  }
  
  int main(int argc, char**argv) {
  
     av_register_all();             // offending library call
  
     return 0;
  
  }
  
  </iostream>

  A program simple as this will have 2 outcomes :

  1. the program runs but crashes if i call 'av_register_all()'
  2. It just tells me he cannot find the libraries.

  Can someone tell me what it is i'm doing wrong ? Or even give me a hint ? I can't really find a lot of good documentation on this one.

  Thanks in advance !