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• ffmpeg PNG - MP4 - Error opening input files : invalid argument

  15 mai 2013, par Max Savage Kramer

  I am following along with this
  visualization project
  converting PNG files in an MP4.

  The only change from the code on the example is that my time stamp starts with
  1.

  ffmpeg -r 20 -b 20M -i example%01d.png output.mp4
  

  And this is what returns

  ffmpeg version N-53055-g7b43120 Copyright (c) 2000-2013 the FFmpeg developers
  built on May 14 2013 20:43:53 with llvm-gcc 4.2.1 (LLVM build 2336.11.00)
  configuration : —disable-yasm
  libavutil      52. 31.100 / 52. 31.100
  libavcodec     55.  9.100 / 55.  9.100
  libavformat    55.  7.100 / 55.  7.100
  libavdevice    55.  0.100 / 55.  0.100
  libavfilter     3. 67.100 /  3. 67.100
  libswscale      2.  3.100 /  2.  3.100
  libswresample   0. 17.102 /  0. 17.102
  **Option b (video bitrate (please use -b:v)) cannot be applied to input file
  example%01d.png — you are trying to apply an input option to an output file or
  vice versa. Move this option before the file it belongs to.
  Error parsing options for input file example%01d.png.
  Error opening input files : Invalid argument**
  

• Using ffmpeg static libraries in an visual studio explress C++ 2010 project

  29 octobre 2015, par Yvo Götz

  As the title says, I have been trying to get ffmpeg/libav libraries to work in MSVC++ 2010.
  However, I keep running in the following error while coding on debug mode.

  code :

  extern "C" 
  
  {
  
      #ifndef __STDC_CONSTANT_MACROS
  
      #define __STDC_CONSTANT_MACROS
  
      #endif
  
      #include 
  
      #include 
  
      #include 
  
      #include 
  
  }
  
  int main( int argc, char* argv[] ) 
  
  {
  
      av_register_all();
  
      return 0;
  
  }

  console :

  1>------ Build started: Project: ffmpeg, Configuration: Debug Win32 ------
  
  1>ffmpeg.obj : error LNK2019: unresolved external symbol _av_register_all referenced in       function _main
  
  1>C:\Users\okki\documents\visual studio 2010\Projects\ffmpeg\Debug\ffmpeg.exe : fatal    error LNK1120: 1 unresolved externals
  
  ========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========

  I used zeranoe’s latest build git-56ba331 (2013-05-14).

  And I have tried the following to fix this :

  • configuring the project to look for both the x64 and x86 libraries.
  • Add the DLLs from the ’shared’ package to both library folders.
  • Add the library directory to both the linker options and VC++ Directories.

  I have been stuck on this for a while, and any suggestion can help.
  If any extra info is needed I will happily provide.

• Converting RGB images into lossless video with avconv / ffmpeg [migrated]

  19 mai 2013, par despens

  I am trying to convert a series of PNG24 images containing a screen animation to a lossless video, so that every pixel is reproduced exactly as it was in the original. But avconv (and ffmpeg) both produce the same, unsatisfying results, which seem to stem from a colospace conversion going wrong.

  This is the version of avconv I am using :

  avconv version 0.8.6-4:0.8.6-0ubuntu0.12.04.1, Copyright (c) 2000-2013 the Libav developers
  
    built on Apr  2 2013 17:02:36 with gcc 4.6.3

  Each of the images is 1280×800 pixels in size. They do not contain any photographic motives, but specially dithered patterns.

  I used the qtrle codec because apparently this is a lossless codec that works very much like animated GIFs or animated PNGs. However, during the conversion to video there seems to happen a color space conversion ("filter") that is messing with the pixels.

  This is the avconv output :

  $ avconv -f image2 -r 30 -i frames.png/wth-%08d.png -vcodec qtrle -pix_fmt rgb24 -t 15 qtrle-30fps-rgb.mov
  
  avconv version 0.8.6-4:0.8.6-0ubuntu0.12.04.1, Copyright (c) 2000-2013 the Libav developers
  
    built on Apr  2 2013 17:02:36 with gcc 4.6.3
  
  Input #0, image2, from 'frames.png/wth-%08d.png':
  
    Duration: 00:11:17.96, start: 0.000000, bitrate: N/A
  
      Stream #0.0: Video: png, bgra, 1280x800, 30 fps, 30 tbr, 30 tbn, 30 tbc
  
  File 'qtrle-30fps-rgb.mov' already exists. Overwrite ? [y/N] y
  
  [buffer @ 0x740a00] w:1280 h:800 pixfmt:bgra
  
  [avsink @ 0x742ac0] auto-inserting filter 'auto-inserted scaler 0' between the filter 'src' and the filter 'out'
  
  [scale @ 0x743680] w:1280 h:800 fmt:bgra -> w:1280 h:800 fmt:rgb24 flags:0x4
  
  Output #0, mov, to 'qtrle-30fps-rgb.mov':
  
    Metadata:
  
      encoder         : Lavf53.21.1
  
      Stream #0.0: Video: qtrle, rgb24, 1280x800, q=2-31, 200 kb/s, 30 tbn, 30 tbc
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (png -> qtrle)
  
  Press ctrl-c to stop encoding
  
  frame=  450 fps= 22 q=0.0 Lsize=  126056kB time=15.00 bitrate=68843.4kbits/s    
  
  video:126052kB audio:0kB global headers:0kB muxing overhead 0.003441%

  This is an original PNG image file :

  

  This is a screenshot of the video being replayed :

  

  Please note that you need to see these images in their original 1280×800 resolution to notice the differences.

  Here is a side-by-side comparison, with the left picture being the original and the right one the outcome after video encoding :

  

  Is there any way I can produce a truly lossless, pixel-perfect video file from a series of PNGs ?