Recherche avancée

Sur d’autres sites (35317)

• mixing frame rates to create one video

  2 avril 2015, par taglius

  I have successfully extracted two videos to .bmp files, one is 30 frames per second, the other is 60. I want to combine them into a single video that plays both clips smoothly at 60fps. If necessary, I have the ability to duplicate the frames of the 30fps video while extracting, which is what I tried in my first attempt. The following is what I have tried to this point, having doubled frames for the 30fps :

  ffmpeg.exe -i output_%%05d.bmp -r 60 -c:v libx264 -vf "setpts=0.5*PTS" -pix_fmt yuv420p out.mp4

  The resulting file is 60fps, but the video appears to be at around 80-90% speed. During encoding, there are a number of yellow warning messages that read Past duration 0.999992 too large (some of the messages are 0.799995, the rest are 0.999992).

• ffmpeg screen capture retina high dpi + less latency

  26 avril 2022, par Cevahir Cuma

  So I try to set up a screen sharing (only video) through ethernet from my Macbook Pro to my Asus Vivobook, to use the Vivobook as second screen.

  


  I'm using ffmpeg for that with the following settings :

  


  ffmpeg -re -f avfoundation -framerate 90 -video_size 2880x1800 -i 3  -y -r 90 -pix_fmt uyvy422  -vcodec libx264 -preset ultrafast -tune zerolatency -crf 6 -bufsize 30k -f mpegts udp://192.168.2.2:50000

  


  The first problem ist, that regardless of the settings only 1440x900 non-high dpi are captured. I haven't found a setting for that. Is it even possible, to transmit retina quality ?

  


  The second question is about the latency. So for now I use following command on the Vivobook to play the video :

  


  ffplay -flags low_delay -vf setpts=0 -fs -noborder udp://192.168.2.2:50000

  


  The latency is quite ok, but are there maybe some more options to save latency ? I'm using a direct 1GbE connection, so datarate and stability should not be a problem.

  


  Thank you so much in advance !

  


• on('progress') not working - node.js ytdl-core fluent-ffmpeg

  9 juillet 2018, par TheBandolero

  So i’m playing with this libraries ytdl-core and fluent-ffmpeg, and basically i got to this function by modifying some examples to fit what i wanted.

  everything works fine except for the second on('progress', progress => ....) call. The first one works as expected, but the second one looks like it isn’t even reached, since Console.log() inside the second on('progress'....) isn’t logging anything at all.

  Also console doesn’t show any errors throughout the whole function, and the outcome is the expected without any problem, except for the second on('progress') issue.

  I can’t figure out what the problem is, so I hope somebody with more experience can point the problem out to me, since it’s getting quite frustrating now...

  function descargarVideoHD(link) {
  
          ytdl.getInfo(link, (err, info) => {
  
              if (err) throw err;
  
  
  
              $('li:contains(' + link + ') .progress').css("visibility", "visible");
  
  
  
              var longitudEnTiempo = parseInt(info.length_seconds);
  
              let id = ytdl.getURLVideoID(link);
  
              var titulo = limpiarTituloDelVideo(info.title);
  
  
  
              let stream = ytdl(id, {
  
                  quality: 'highestaudio',
  
                  //filter: 'audioonly',
  
              });
  
  
  
              //var audioOutput = path.resolve(__dirname, 'audio_' + titulo + '.mp4');
  
              var mainOutput = path.resolve(__dirname, titulo + '.mp4');
  
              var renameFileName = titulo + '.mp4';
  
  
  
              var audioOutput = path.resolve(__dirname, titulo + '.mp3');
  
  
  
              ffmpeg(stream)
  
                  //.audioBitrate(128)
  
                  .audioBitrate(256)
  
                  .save(`${__dirname}/${titulo}.mp3`)
  
                  .on('progress', (p) => {
  
                      //readline.cursorTo(process.stdout, 0);
  
                      //process.stdout.write(`${p.targetSize}kb downloaded`);
  
                      var hmsA = p.timemark;
  
                      var aA = hmsA.split(':');
  
                      var secondsA = parseInt((+aA[0]) * 60 * 60 + (+aA[1]) * 60 + (+aA[2]));
  
                      var porcentageA = (((secondsA / longitudEnTiempo) * 100) / 2).toFixed(2);
  
                      $('li:contains(' + link + ') .progress .determinate').css("width", porcentageA + "%");
  
                      //console.log(titulo + ' procesado al ' + porcentage + '%');
  
                  })
  
                  .on('end', () => {
  
                      ffmpeg()
  
                          .input(ytdl(link, {
  
                              filter: format => {
  
                                  return format.container === 'mp4' && !format.audioEncoding;
  
                              }
  
                          }))
  
                          .videoCodec('copy')
  
                          .input(audioOutput)
  
                          .audioCodec('copy')
  
                          .save(mainOutput)
  
                          .on('error', console.error)
  
                          .on('progress', progress => {
  
                              console.log('Dentro de OnProgress...');
  
                              var hms = progress.timemark;
  
                              console.log('Timemark: ' + hms);
  
                              var a = hms.split(':');
  
                              var seconds = parseInt((+a[0]) * 60 * 60 + (+a[1]) * 60 + (+a[2]));
  
                              console.log('Segundos: ' + seconds);
  
                              var porcentage = ((((seconds / longitudEnTiempo) * 100) / 2) + 50).toFixed(2);
  
                              console.log('Procesado al ' + porcentage + '%');
  
                              $('li:contains(' + link + ') .progress .determinate').css("width", porcentage + "%");
  
                          }).on('end', () => {
  
                              fs.unlink(audioOutput, err => {
  
                                  if (err) {
  
                                      console.error(err);
  
                                  }
  
                                  else {
  
                                      $('li:contains(' + link + ') .progress .determinate').css("width", "100%");
  
                                      $('li:contains(' + link + ') .secondary-content.material-icons').text('done');
  
                                      $('li:contains(' + link + ') .secondary-content.material-icons').addClass('text-green');
  
                                      /* $('li:contains(' + link + ')').remove();
  
                                      var indexItem = listaEnlacesYoutube.indexOf(link);
  
                                      listaEnlacesYoutube.splice(indexItem, 1); */
  
                                  }
  
                              });
  
                          });
  
                  });
  
          });
  
      }