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• Unresolved externals trying to use ffmpeg

  29 août 2013, par Asik

  I'm trying to use some functions from ffmpeg and am running into resilient linker errors. Here's what I did :

  • Downloaded the latest 32-bit "Dev" build from http://ffmpeg.zeranoe.com/builds/ (i.e. ffmpeg-20130418-git-ee94362-win32-dev)
  • Created a "General - empty" C++ project in Visual Studio 2012 Premium
  • Added the [ffmpeg]/lib folder to Linker -> Input -> "Additional Library Directories"
  • Added "swscale.lib ;avutil.lib ;avformat.lib ;avdevice.lib ;avcodec.lib ;" to Linker -> Input -> "Additional Dependencies"
  • Added the following under C++ -> General -> Additional Include Directories :
    • [ffmpeg]/include
    • [ffmpeg]/include/libswscale
    • [ffmpeg]/include/libavformat

  This is my main.cpp :

  #include "avformat.h"
  
  
  
  int main()
  
  {
  
      av_register_all();
  
  } 

  This fails with :

  error LNK2019 : unresolved external symbol "void __cdecl
  av_register_all(void)" (?av_register_all@@YAXXZ) referenced in
  function _main

  How can I fix this error ?

• avcodec/asvenc : Simplify writing extradata

  22 mai, par Andreas Rheinhardt

  avcodec/asvenc : Simplify writing extradata
  It is confusing, because the AV_RL32("ASUS") already
  
  returns an endian-independent value, so converting
  
  it via av_le2ne32() makes no real sense : one would need
  
  to transform the native value to le and write it as
  
  a natie endian uint32_t for it to make sense (the current
  
  code only works because le2ne32 and ne2le32 are the same
  
  for both endianness that we care about). Or one can just
  
  use AV_RL32 and create the number via MKTAG().
  Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
  

  • [DH] libavcodec/asvenc.c

• FFMPEG & HW Acceleration Unable to find a suitable output format for 'cuda' ?

  10 juillet 2022, par user2522885

  I'm curious about FFMPEG and GPU hardware acceleration. My Windows 10 system uses the Asus / nVidia GTX 760 graphics card and Intel i5-2500K CPU. My graphics card claims to be of the Kepler architecture with CUDA 3.0 as shown here.

  


  Instead of going through the hassles of compiling FFMPEG with hw acceleration support i downloaded a pre-compiled binary from here and here.

  


  Next, i tried running a test with hw acceleration options as recommended here :

  


  ffmpeg -y -vsync 0 -i "input.mkv" -hwaccel cuda -hwaccel_output_format cuda -c:a copy -c:v h264_nvenc "output.mp4"


  


  I then received the error message :

  


  


  [NULL @ 000002257f4af540] Unable to find a suitable output format for 'cuda'

  


  cuda : Invalid argument

  


  


  What am i doing wrong ? For the record i install the CUDA setup file but it made no difference. I am using the latest nVidia drivers.

  


  UPDATE

  


  I modified the line to :

  


  ffmpeg -y -vsync 0 -hwaccel cuda -hwaccel_output_format cuda -i "input.mkv" -c:a copy -c:v h264_nvenc "output.mp4" 


  


  The new error message is :

  


  


  [h264_nvenc @ 00000191f5c8d400] Lossless encoding not supported

  


  [h264_nvenc @ 00000191f5c8d400] Provided device doesn't support required NVENC features Error initializing output stream 0:0 — Error
while opening encoder for output stream #0:0 - maybe incorrect
parameters such as bit_rate, rate, width or height