Advanced search

On other websites (5141)

• FFmpeg libraries on Windows - Undefined References

  26 November 2018, by Gomes

  I am trying to use FFmpeg libraries available from here under Windows 10 (64 bits). I downloaded version=20181126-90ac0e5, architecture=Windows-64, Linking=Dev. There are 3 folders inside that FFmpeg folder: examples, lib and include.
  To use these libraries I copied the contents of the "include" folder to the "include" folder of my MinGW installation. I also copied the contents of the "lib" folder to the "lib" folder of MinGW.
  I try to compile the decode_video.c example that comes inside the examples folder with the following way:

   gcc decode_video.c -o decode_video.exe -lavcodec -lavutil -lavformat -lm

  The compiler gives me these undefined references:

   undefined reference to `avcodec_send_packet'
  
   undefined reference to `avcodec_receive_frame'
  
   undefined reference to `av_packet_alloc'
  
   undefined reference to `avcodec_find_decoder'
  
   undefined reference to `av_parser_init'
  
   undefined reference to `avcodec_alloc_context3'
  
   undefined reference to `avcodec_open2'
  
   undefined reference to `av_frame_alloc'
  
   undefined reference to `av_parser_parse2'
  
   undefined reference to `av_parser_close'
  
   undefined reference to `avcodec_free_context'
  
   undefined reference to `av_frame_free'
  
   undefined reference to `av_packet_free'

  I would like to know what I am doing wrong here. Any guidance is very welcome.

• Revision 66762: Passage en LF Unix plutot que Windows qui semble poser des soucis sur ...

  12 October 2012, by eric@… — Log

  Passage en LF Unix plutot que Windows qui semble poser des soucis sur certains serveurs.
  Incrément de version pour marquer le coup.

• Retrieving stdout from subprocess in Windows

  6 August 2017, by Cryptite

  I can call FFmpeg with subprocess.Popen and retrieve the data I need, as it occurs (to get progress), but only in console. I’ve looked around and seen that you can’t get the data "live" when running with pythonw. Yet, waiting until the process finishes to retrieve the data is moot, since I’m trying to wrap a PyQT GUI around FFmpeg so I can have pretty progress bars and whatnot. So the question is, can you retrieve "live" data from a subprocess call when using pythonw?

  I haven’t tried simply compiling the application with py2exe yet as a windows application, would that fix the problem?