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• I am trying to use ffmpeg to separate audio from video, but after downloading the ffmpeg build I cannot seem to activate it in Power Shell [duplicate]

  19 janvier 2021, par Row Boater

  Ok, look y'all, I am NOT an aspiring programmer. I'm simply trying to separate audio from video of a youtube video I downloaded.

  


  What I've done :

  


  Downloaded YT vid using 4k video Downloader

  


  I downloaded ffmpeg build from https://ffmpeg.org/download.html#build-windows

  


  I downloaded WinZip in order to access the ffmpeg files.

  


  I thought I used winzip correctly, but whenever I paste the command code line recommended to me, ffmpeg -i video.mp4 -c:a pcm_s16le audio.wav, I receive the following :

  


  


  PS C :\Users\user\Videos\4K Video Downloader> ffmpeg -i video.mp4 -c:a
pcm_s16le audio.wav ffmpeg : The term 'ffmpeg' is not recognized as
the name of a cmdlet, function, script file, or operable program.
Check the spelling of the name, or if a path was included, verify that
the path is correct and try again. At line:1 char:1

  


  

  • ffmpeg -i video.mp4 -c:a pcm_s16le audio.wav

  


  • 


      + CategoryInfo          : ObjectNotFound: (ffmpeg:String) [], CommandNotFoundException
  + FullyQualifiedErrorId : CommandNotFoundException



    


  


  


  PS C :\Users\user\Videos\4K Video Downloader>

  


  


  This is all Phoenician to me, but what I take away is that I have not completed some step to fully incorporate the ffmpeg code into my system. I believe that I am not using Winzip correctly.

  


  Thanks for your time.

  


• Using ffmpeg and ffmpeg-cli-wrapper (Java) to remove black frames in a mp4 video made by Twilio [closed]

  3 janvier 2024, par Duc Nguyen

  I am using Programmable Twilio, when 2 users are recording and pause, there is a silence space with black frames in the output.
Is there a way in Twilio or in ffmpeg to remove all black frames (empty-silent spaces) ? I am using Java and ffmpeg-cli-wrapper

  


  I tried this https://video.stackexchange.com/questions/16564/how-to-trim-out-black-frames-with-ffmpeg-on-windows but it did not help.

  


• ffmpeg generate first non black frame

  17 octobre 2019, par Milousel

  I get via readstream video from AWS server. I modify it into different format and save it back into server. After that I want to create non black image from first frame of this video. So I need to check if first frame is black or not.

  ffmpeg(stream)
  
          .size('1320x438')
  
          .videoCodec('libx264')
  
          .toFormat('avi')
  
          .output(fileName)
  
          .on('end', function() {
  
            console.log('Finished processing video');
  
            const params = {
  
              Body: fs.createReadStream(fileName),
  
              Bucket: videoBucket,
  
              Key: 'test/modification/' + fileName,
  
            };
  
            s3.putObject(params, (err, data) => {
  
              if (err) {
  
                console.log(err);
  
              }
  
            });
  
          })
  
          .output(screensName + '.jpg')
  
          .outputOptions(
  
            '-frames',
  
            '1', // Capture just one frame of the video
  
          )
  
          .on('end', function() {
  
            console.log('Finished processing screenshot');
  
            const params = {
  
              Body: fs.createReadStream(screensName + '.jpg'),
  
              Bucket: videoBucket,
  
              Key: 'test/shots/' + screensName + '.jpg',
  
            };
  
            s3.putObject(params, (err, data) => {
  
              if (err) {
  
                console.log(err);
  
              }
  
            });
  
          })
  
          .run();