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• error while linking with ffmpeg under windows using VC 2010

  15 octobre 2017, par Alienpenguin

  I am writing a project on windows that uses opencv (3.2.0 compiled from sources).

  I am trying to add ffmpeg to my project in order to use it to save a mpeg file ; since compiling ffmpeg-3.3.[34] is quite a cumbersome process on windows (i do not currently have mingw or yasm installed) i decided to give the binary packages a try. (downloaded both dev and shared packages from ffmpeg.zeranoe.com)

  Since there were not differentiated dll for "debug" and "release" mode i put them in a common path that would be picked by both visual studio compiling mode.

  When running my project in "debug" mode everything is fine, while after having compiled the "release" version i get the following error when launching the executable

  The error encountered is : (translated from italian so please bear with some imprecise wording) Impossible to find the entry point ?fastFree@cv@YAXPAX@Z of the procedure in the dll avcodec-57.dll

  Can anyone point me in the right direction ? how come the dll complains about a missing symbol only in "release" mode ? also, the signature of the symbol seems to be related to opencv library, but how on earth is this possible ? since opencv was already in the project and is not interacting with ffmpeg ?

• colored TV-Noise with windows

  8 janvier 2024, par LookAndSee

  I have some question to the colored noise at image 2 of the following thread :

  


  Simulating TV noise

  


  

  • how can i get this in windows ? I like a random pattern consisting of red, green, blue, white and black points, like 255:0:0, 0:255:0, 0:0:255, 255:255:0, 0:0:0 and 255:255:255 - no pink, no orange, no cyan ... at the first step.

  


  


  but random in all 3 places always delievers (with ceil, floor or round) whole black, or whole white or bw-noise :-(
does it mean, the random(1) per point is 3 times the same in one computing-cycle ?

  


  Any suggestion ?

  


  This is what i tried :

  


  ffmpeg -y -f lavfi -i nullsrc=s=1280x720 -filter_complex "geq=r=(round(random(1)))*255:g=(round(random(1)))*255:b=(round(random(1)))*255;aevalsrc=-2+random(0)" -t 5 output.mkv


  


• python ffmpeg and pydub on windows

  11 mars 2016, par Yonatan Kreiner

  I am trying to import the ffmpeg and pydub to my python script.
  I downloaded the ffmpeg for windows from https://ffmpeg.zeranoe.com/builds/
  and put the bin folder in the system path.
  I can use it from the CMD but I need to import it to the script
  for the pydub library to work.
  I had tried to execute

  AudioSegment.from_mp3("something.mp3").export("somethingElse.wav", format="wav")

  without importing it but It throws FileNotFoundException.
  Any suggestions ?