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• How to use c99conv.exe to convert C99 to C89

  21 février 2015, par loppp

  Background

  I got ffmpeg Windows libraries from Zeranoe FFmpeg builds but there’s a problem : When I tried to use the headers, I found some of the macros (e.g. av_ts2str) are written using C99 syntax.

  So now I am working on converting the headers to C89, which is compatible with MSVC (now I am using 2013).

  I downloaded c99conv.exe but when I execute it, I get errors :

  avcodec.h:31:10: fatal error: 'libavutil/samplefmt.h' file not found

  Question

  Am I on the right track that every ffmpeg Windows developer will go ? (I am just thinking is there any Visual Studio sln package, sure, with ffmpeg C89 headers, available so that Windows ffmpeg developers can start immediately from there, without wasting 2–5 days to just setup the environment… Sound greedy but it would great help for the newbies like me.)

  How to use c99conv.exe to convert these headers to C89 ?

• Merge remote-tracking branch ’cus/stable’

  17 mai 2014, par Michael Niedermayer

  Merge remote-tracking branch ’cus/stable’
  * cus/stable :
  
    ffplay : add support for toggling between multiple video filters with the w key
  
    ffplay : fix typo in docs
  
    ffplay : try multiple sample rates if audio open fails
  
    cmdutils : replace usages of "#ifdef __MINGW32__" with "#ifdef _WIN32" because MSVC only defines _WIN32
  
    ffplay : fix compilation with Visual Studio
  
    ffplay : increase AV_SYNC_THRESHOLD_MIN to 0.04
  Merged-by : Michael Niedermayer <michaelni@gmx.at>
  

  • [DH] cmdutils.h
  • [DH] doc/ffplay.texi
  • [DH] ffplay.c

• OpenCV and RTMP

  28 mai 2014, par user2723463

  I want to be able to create an application that can read and publish an RTMP stream.

  Using OpenCV i could read rtp due to it’s ffmpeg backend.

  Stream video from ffmpeg and capture with OpenCV

  C++ RTMP is another possibility, but this is an RTMP server so it mainly requests and sends files. Although open source, i am unsure how to build or integrate this into a Visual Studio application in such a way as to make the function calls available to my project.

  OTher sources indicate that OpenCV’s RTSP isn’t great.

  http://workingwithcomputervision.blogspot.co.nz/2012/06/issues-with-opencv-and-rtsp.html

  How can you run a streaming server, such as RTMP C++ and get the raw data out. OpenCV can encode and decode image data for streaming, but how can you link the two ?

  Could a C++ application pipe a stream together ? How could i interface with that stream to send it more images ? Also, for receiving images ?

  Regards,