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• Problems linking to FFMPEG library in Visual Studio 2010

  11 décembre 2013, par Dídac Pérez

  I have cross-compiled FFMPEG from Debian using the mingw32 toolchain. The result of the compilation is a set of .a files. When I try to use them in my project I get linker errors, concretely the following ones :

  1>RTSPCapture.obj : error LNK2019: unresolved external symbol _avformat_free_context referenced in function ...
  
  1>RTSPCapture.obj : error LNK2019: unresolved external symbol _avio_close referenced in function ...
  
  1>RTSPCapture.obj : error LNK2019: unresolved external symbol _avcodec_close referenced in function ...
  
  (and much more...)

  I have already included the header files like this :

  extern "C"
  
  {
  
      #include <libavcodec></libavcodec>avcodec.h>
  
      #include <libavformat></libavformat>avformat.h>
  
      #include <libavformat></libavformat>avio.h>
  
  }

  And I use the .a files like this :

  #pragma comment(lib, "libavcodec.a")
  
  #pragma comment(lib, "libavformat.a")
  
  #pragma comment(lib, "libavutil.a")

  May I know why I am still getting linker errors ? Best regards,

  EDIT : I have realized that this is not possible. So, what should I do to use FFMPEG library in my MSVC2010 project taking into account that I can't compile ffmpeg in Windows ? it seems to be REALLY difficult...

• Upload FFmpeg output directly to Amazon S3

  26 octobre 2017, par user1790300

  I am using the fluent-ffmpeg library with node.js to transcode videos originally in a flash movie format to the mp3 format with multiple resolutions, 1080p, etc.. Once the transcoding is complete, I would like to move the transcoded video to an s3 bucket.

  I pull the original .flv file from a source s3 bucket and pass the stream to the ffmpeg constructor function. The issue is after the transcoding completes, how do I then get the stream of the mp4 data to send to s3.

  Here is the code I have so far :

          var params = {
  
              Bucket: process.env.SOURCE_BUCKET,
  
              Key: fileName
  
          };
  
          s3.getObject(params, function(err, data) {
  
              if (err) console.log(err, err.stack); // an error occurred
  
  
  
              var format = ffmpeg(data)
  
              .size('854x480')
  
              .videoCodec('libx264')
  
              .format('flv')
  
              .toFormat('mp4');
  
              .on('end', function () {
  
                  //Ideally, I would like to do the uploading here
  
  
  
                  var params = {
  
                     Body: //{This is my confusion, how do I get the stream to add here?},
  
                     Bucket: process.env.TRANSCODED_BUCKET,
  
                     Key: fileName
  
                  };
  
                  s3.putObject(params, function (err, data) {
  
  
  
                 });
  
              })
  
              .on('error', function (err) {
  
                  console.log('an error happened: ' + err.message);
  
              });
  
  
  
          });

  For the code above, where can I get the transcoded stream to add to the "Body" property of the params object ?

  Update :

  Here is a revision of what I am trying to do :

  var outputStream: MemoryStream = new MemoryStream();
  
  
  
          var proc = ffmpeg(currentStream)
  
              .size('1920x1080')
  
              .videoCodec('libx264')
  
              .format('avi')
  
              .toFormat('mp4')
  
              .output(outputStream)
  
              // setup event handlers
  
              .on('end', function () {
  
                  uploadFile(outputStream, "").then(function(){
  
                      resolve();
  
                  })
  
              })
  
              .on('error', function (err) {
  
                  console.log('an error happened: ' + err.message);
  
              });

  I would like to avoid copying the file to the local filesystem from s3, rather I would prefer to process the file in memory and upload back to s3 when finished. Would fluent-ffmpeg allow this scenario ?

• bfi : Add some very basic sanity checks for input packet sizes

  28 septembre 2013, par Martin Storsjö

  bfi : Add some very basic sanity checks for input packet sizes
  CC : libav-stable@libav.org
  
  Signed-off-by : Martin Storsjö <martin@martin.st>
  

  • [DH] libavformat/bfi.c