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• ffmpeg - Any way to add a transition to a list of clips to combine into a single video ?

  29 avril, par J. Pena

  Let's say I have a directory with 5 videos with the titles listed as the following

  


  

  • 1.mp4

  


  • 2.mp4

  


  • 3.mp4

  


  • 4.mp4

  


  • 5.mp4

  


  


  I created the text file named mylist.txt with the following written.

  


  file '1.mp4'
file '2.mp4'
file '3.mp4'
file '4.mp4'
file '5.mp4'


  


  I have an ffmpeg command that will combine these clips into one file beautifully already using the text file.

  


  ffmpeg -f concat -safe 0 -i mylist.txt -c copy combined.mp4


  


  My question is how can I add a fade transition to clips 2-4 using the text file ? The filter_complex parameter gives me an error.

  


  Streamcopy requested for output stream fed from a complex filtergraph. Filtering and streamcopy cannot be used together.


  


• ffmpeg - How to combine overlapping clips from single video ?

  21 février, par anon

  I am trying to use ffmpeg to take a few clips from a video and combine them together, similar to this :

  


  Cut multiple parts of a video with ffmpeg

  


  Except that the clips come from timestamps that overlap. My command looks like this :

  


  "C:\Program Files\ffmpeg\bin\ffmpeg.exe" -y -i "C:\temp\5min.mp4" ^
-vf "select='between(t,4,6.5)+between(t,5,6)', setpts=N/FRAME_RATE/TB" ^
-af "aselect='between(t,4,6.5)+between(t,5,6)', asetpts=N/SR/TB" "C:\temp\5min-clip.mp4"


  


  The video that I get only contains the first clip. I am on the latest version of ffmpeg. How do I accomplish this ?

  


• The ffmpeg output binary stream front-end uses WebSocket to accept and cannot be played [closed]

  17 novembre 2024, par KIMEOOK

  Server push nodejs

  


  Use ws service to pass to the front end

  


        ffmpegs = spawn('ffmpeg', [
        '-f', 'gdigrab',  // 这是 Windows 下用于捕获屏幕的输入格式
        '-framerate', '60',  // 捕获帧率
        '-i', 'desktop',  // 捕获桌面（即屏幕）
        '-c:v', 'vp8',  // 视频编码格式
        '-f', 'webm',  // 设置输出为 mpegts 流
        '-pix_fmt', 'yuv420p',
        'pipe:1',  // 输出到管道
      ]);


  


  


  


  Front-end rendering

  


  
      let videoElement = document.getElementById('screenVideo');

      let mediaSource = new MediaSource();
      videoElement.src = URL.createObjectURL(mediaSource);

      mediaSource.addEventListener('sourceopen', () => {

        let sourceBuffer = mediaSource.addSourceBuffer('video/webm; codecs="vp8"'); 

        let ws = new WebSocket(`ws://${ip}:3000/?device=${encodeURIComponent(selectedDevice)}`);

        ws.onmessage = (event) => {
          const data = new Uint8Array(event.data);
          if (!sourceBuffer.updating) {
            try {
              sourceBuffer.appendBuffer(data);
              console.log('ok')
            } catch (error) {
              console.error('Error appending buffer:', error);
            }
          } else {
            console.log('SourceBuffer is busy');
          }
        };

        ws.onerror = (error) => {
          console.error('WebSocket error:', error);
        };

        ws.onclose = () => {
          console.log('WebSocket connection closed');
        };

        if (mediaSource.readyState === 'open') {
          videoElement.play().catch(err => {
            console.error('Error attempting to play the video:', err);
          });
        }
}


  


  The video keeps spinning in circles and cannot be played normally.

  


  

  


  Unable to play normally. What's the problem ?