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Sur d’autres sites (15639)

  • 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();

  • Rotate video adding black bars with ffmpeg

    13 février 2016, par MrMoog

    I have a lot of mp4 full hd videos made with a smartphone that looks rotated 90°.

    These files have proper rotation metadata and they plays correctly on VLC or other desktop mediaplayers, but I want to display them on my dvd player that does not handles mp4 metadata.

    So I tried to transpose with ffmpeg but I obtain 1080x1920 files, resolution obviously not recognized by tv/dvd-player.

    How can I transpose, resize and add black side (left/right) bars of the correct dimensions to get "correct" 1920x1080 videos ?

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