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• FFMPEG : Compilation error for custom code

  13 février 2014, par sam

  I have a video decoder integrated in FFMPEG. All the code that i have currently integrated is pure C-code. For performance purposes, i have to integrate the corresponding SSE code into the FFMPEG's libavcodec.

  So i followed the same steps as i did while integrating the pure c code. While configuring i used the following command :

  ./configure --enable-sse --disable-yasm

  I have disabled yasm as i dont have one installed, if needed i can install it, but for c code integration, i had not installed it.

  After configuring, i give the command make, but i get all errors in my SSE code. So my first question is :

  -> Does giving —enable-sse ensures that the sse code will get compiled or i need to do something extra ? (Note : my processor supports upto sse 4.2 and the code i want to integrate is also in SSE4.2)

  Next, inorder to resolve this what i did was, i opened the config.mak file, and found all gcc commands and i appended them with a -msse4.2 option (this option i use to compile standalone SSE code that is, compiling code without integrating it with FFMPEG).

  After modifying the config.mak(which i think i shouldn't, because it is auto-generated on ./configure command), although i'm not getting any error in SSE code, but i get errors like undefined variable ... and error:No previous prototype for all the old C code which is already a part of the code( although in the source file i have included the required headers).

  So my second question is, I have manually modified config.mak file is it ok to do so ? If so, then how do i resolve the above issue ?

  Any help regarding this issue will be really helpful to me. Moreover there is no info on net available on compiling the FFMPEG code with SSE (except for using —enable-sse option while configuring, which i think is not working for me).

  Thanks in advance.

• rtsp server using ffmpeg c code

  24 juin 2018, par PFMelamed

  I am using ffmpeg lib :

  ffmpeg version git-2017-09-16-08ec828 
  
  Copyright (c) 2000-2017 the FFmpeg developers
  
    built with gcc 5.4.0 (Ubuntu 5.4.0-6ubuntu1~16.04.4) 20160609
  
    configuration: --enable-pic --enable-shared --extra-libs=-ldl --enable-gpl --enable-libass --enable-libfdk-aac --enable-libmp3lame --enable-libopus --enable-postproc --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-nonfree
  
    libavutil      55. 75.100 / 55. 75.100
  
    libavcodec     57.106.101 / 57.106.101
  
    libavformat    57. 82.100 / 57. 82.100
  
    libavdevice    57.  8.101 / 57.  8.101
  
    libavfilter     6.105.100 /  6.105.100
  
    libswscale      4.  7.103 /  4.  7.103
  
    libswresample   2.  8.100 /  2.  8.100
  
    libpostproc    54.  6.100 / 54.  6.100

  Hyper fast Audio and Video encoder

  I am trying to write an RTSP server using the above version of ffmpeg libs. I have tried a large variety of approachess with no success. Has anyone already written such code with this ffmpeg version or does anyone know of such code ? Or, do I need to change versions ? Any suggestions or answers are welcome.

• How can I use ffmpeg x11 capture in C++ code

  12 juin 2015, par Özüm Safaoğlu

  I want to grab x11 desktop in linux using ffmpeg, hoping it would give a fast output. However, I would like to do it within C++ code. I suppose it is possible to output it to stdout in the command line with ffmpeg command, however if possible i would prefer reading from memory buffer directly. Is there a way I can do this ?