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• How to concat two/many mp4 files(Mac OS X Lion 10.7.5) with different resolution, bit rate [on hold]

  3 septembre 2013, par praveen

  I have to concat different mp4 files into single mp4 file. i am using following ffmpeg command but this command is only working if both file is same(copy, or if all video property is same(codec, resolution,bitrate....) ) other wise result is unexpected video. (I am working on Mac OS X Lion 10.7.5)

  ffmpeg commad :

  ffmpeg -i images/1/output.mp4 -c copy -bsf:v h264_mp4toannexb -f mpegts intermediate1.ts
  
  ffmpeg -i images/1/Video2.mp4 -c copy -bsf:v h264_mp4toannexb -f mpegts intermediate2.ts
  
  ffmpeg -i "concat:intermediate1.ts|intermediate2.ts" -c copy -bsf:a aac_adtstoasc output2.mp4

  console output :

  [mpegts @ 0x7f8c6c03d800] max_analyze_duration 5000000 reached at 5000000 microseconds
  
  
  
  Input #0, mpegts, from 'concat:intermediate1.ts|intermediate2.ts':
  
  Duration: 00:00:16.52, start: 1.400000, bitrate: 1342 kb/s
  
  Program 1 
  
  Metadata:
  
  service_name    : Service01
  
  service_provider: FFmpeg
  
  Stream #0:0[0x100]: Video: h264 (Main) ([27][0][0][0] / 0x001B), yuv420p, 1024x768 [SAR   1:1 DAR 4:3], 25 fps, 25 tbr, 90k tbn, 50 tbc
  
  Stream #0:1[0x101](und): Audio: aac ([15][0][0][0] / 0x000F), 48000 Hz, stereo, fltp, 101 kb/s
  
  
  
  
  
  
  
  Output #0, mp4, to 'output2.mp4':
  
  Metadata:
  
  encoder         : Lavf54.63.104
  
  Stream #0:0: Video: h264 ([33][0][0][0] / 0x0021), yuv420p, 1024x768 [SAR 1:1 DAR 4:3],      q=2-31, 25 fps, 90k tbn, 90k tbc
  
  Stream #0:1(und): Audio: aac ([64][0][0][0] / 0x0040), 48000 Hz, stereo, 101 kb/s
  
   Stream mapping:
  
  Stream #0:0 -> #0:0 (copy)
  
  Stream #0:1 -> #0:1 (copy)
  
  Press [q] to stop, [?] for help
  
   frame=  586 fps=0.0 q=-1.0 Lsize=    2449kB time=00:00:20.11 bitrate= 997.4kbits/s    
  
   video:2210kB audio:225kB subtitle:0 global headers:0kB muxing overhead 0.578335%

  Please help

• Videocapture error : Assertion desc failed at src/libswscale/swscale_internal.h:668 error

  1er février 2019, par Alejandro Silvestri

  Videocapture read give me this error. It started recently when I updated to opencv4. No errors on opencv4 installation. libswscale is up to date, I have libswscale.so.4.8.100.

  The code is a simple "open" and "read" video to isolate the problem :

  #include<opencv2></opencv2>core.hpp>
  
  #include<opencv2></opencv2>videoio.hpp>
  
  #include<opencv2></opencv2>highgui/highgui.hpp>
  
  #include<string>
  
  #include <iostream>
  
  
  
  int main(int argc, char **argv){
  
      cv::VideoCapture video;
  
      std::string filename(argv[1]);
  
      std::cout &lt;&lt; "filename " &lt;&lt; filename &lt;&lt; std::endl;
  
      std::cout &lt;&lt; "video.open " &lt;&lt; video.open(filename) &lt;&lt; std::endl;
  
      union {
  
          char ch[5] = {0};
  
          int i4cc;
  
      } fourcc;
  
      fourcc.i4cc = (int) video.get(cv::CAP_PROP_FOURCC);
  
      std::cout &lt;&lt; "Fourcc " &lt;&lt; fourcc.ch &lt;&lt; std::endl;
  
      cv::Mat frame;
  
      while(true){
  
          std::cout &lt;&lt; "video.read " &lt;&lt; video.read(frame) &lt;&lt; ", Mat.rows " &lt;&lt; frame.rows &lt;&lt; std::endl;
  
          cv::imshow("imagen", frame);
  
      }
  
  }
  
  </iostream></string>

  The output is this

  filename ../Archivos/Vuelta al Lab Uno 720p.MP4
  
  video.open 1
  
  Fourcc avc1
  
  Assertion desc failed at src/libswscale/swscale_internal.h:668

  VideoCapture opens the video file, shows fourcc property, and then fails to read first image.

  If you ask, video file is fine, I tried with other video files and other video formats, with the same error. These videos play well with ffmpeg.ffplay !

  By the way, VideoCapture.read is working fine with webcam. So, it’s not clear where the problem is.

  Thank you for your time.

• 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 ?