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• 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 ?

• cvCreateFileCapture always returns "NULL"

  4 août 2012, par user1553247

  I am making an iphone-app with Xcode 4.3.3 and OpenCV 2.4

  I used that "cvCreateFileCapture("simtom.mp4")" to get frame from '.mp4' file but unfortunately, cvCreateFileCapture() always returns "NULL".

  What is the problem ?

  Here is my source code.

   CvCapture *m_pMusicVideo;     
  
  
  
   m_pMusicVideo = cvCreateFileCapture("simtom.mp4");

• ffmpeg - avcodec_decode_audio3 always returns 0 with aac decoding on android

  26 novembre 2011, par Android007

  I am writing an audio decoder based on ffmpeg for android, where I have to decode aac audio, but because of some reason it always returns 0 bytes decoded.

  Looks like I pass everything right. Can anybody tell me what went wrong in my case.I copied code from ffplay.c.
  What is the reason avcodec_decode_audio3 function always returns zero ?

  Here is the code from ffplay.c :

  AVPacket *pkt_temp = &is->audio_pkt_temp;
  
      AVPacket *pkt = &is->audio_pkt;
  
      AVCodecContext *dec= is->audio_st->codec;
  
      int n, len1, data_size;
  
      double pts;
  
  
  
            data_size = sizeof(is->audio_buf1);
  
          len1 = avcodec_decode_audio3(dec, (int16_t *)is->audio_buf1, &data_size, pkt_temp);
  
          if (len1 < 0) {
  
              pkt_temp->size = 0;
  
              break;
  
          } 
  
  
  
         if (data_size <= 0){
  
                     //This block always gets executed.
  
              continue;
  
      }