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• How to get FFmpeg to consistently apply speed effect to first few frames ?

  16 janvier 2021, par melody_florum

  I am using FFmpeg to apply speed effects to short gifs and videos and I noticed strange stuttering on looping gifs when sped up. I manually tested and found what was going on. FFmpeg failed to apply the speed filter to the first few frames of the video.

  


  I started with this file, which loops between the numbers "1 2 3 4" every frame.

  


  123410fps.mp4

  


  I then ran the command ffmpeg -i 123410fps.mp4 -vf setpts=0.5*PTS 123410fpsout.mp4

  


  That left me with this file : 123410fpsout.mp4

  


  On close analysis, I discovered that the output file didn't show a repeating 1 3 1 3 or 2 4 2 4 pattern, but shows 1 2 3 4 1 3 1 3 1 3... the speed effect didn't apply for the first few frames

  


  I apologize if it sounds like i'm being super nitpicky, but my usage for this is on very short gifs and videos where this effect is very apparent. How can I prevent this effect from happening and have a 100% consistent speed effect applied to the video ? I don't mind using other non-ffmpeg software but a CLI solution that works easily for most videos is ideal.

  


  In case anyone is wondering, I don't use ffmpeg to encode gifs, i use gifski from ffmpeg exported image sequences. The problem shows up even when no gifs are used, so it's not a gifski problem.

  


• Multiple inputs with ffmpeg ?

  7 octobre 2020, par kinx

  I am trying to open multiple RTSP streams with fluent-ffmpeg, however I'm getting the error :

  


  Error: Only one output stream is supported

  


  I was able to open multiple streams but with different websocket ports using node-rtsp-stream however I needed more features so I am trying to build my own project. I noticed that node-rtsp-stream uses child_process while I'm using fluent-ffmpeg but I found a project that's also using fluent-ffmpeg and was able to have different streams.

  


  Here's my following code :

  


  class Stream extends EventEmitter {
  constructor(url) {
    super();
    this.startStream(url);
  }
  async startStream(url) {
    const wss = new WebSocket.Server({ port: 8080 });
    const name = Crypto.createHash("md5").update(url).digest("hex");
    const command = ffmpeg(url)
      .addInputOption("-rtsp_transport", "tcp", "-buffer_size", "102400")
      .fps("24")
      .outputOptions("-f", "mpegts")
      .on("error", (err) => {
        console.log(err);
      });
    console.log("id", name);
    wss.on("connection", (socket, req) => {
      if (req.url === "/" + name) {
        const ffstream = command.pipe();
        ffstream.on("data", (data) => {
          socket.send(data);
        });
      }
    });
  }
}
const cams = ["rtsp://someip:554/1", "rtsp://someip2:554/1"];
cams.forEach((cam) => {
  const s = new Stream(cam);
});


  


  What am I doing wrong and how do I open multiple streams ?

  


• We're Creating a New AI tool and Got Stuck on This 1 Step [closed]

  22 février 2024, par Daniel

  Thanks for helping with this question,

  


  Anybody who knows PHP, React js, FFmpeg, or Open AI API can help here :

  


  We are currently creating a tool with PHP laravel and React JS. It lets normal creators input a simple text prompt and they'll get a fully original short (30 video fast-paced video) for their channel. But we have an output problem :

  


  

  • On the output of the videos, there's supposed to be AI generated images that have cool animations in order to make everything more fast paced. But our developers are making animations that are super slow and not dynamic or interesting enough. What open source library/tech could we use to create stunning animations and more action ?! Any suggestions would help here,

  


  


  ---

  


  We are currently using an FFmpeg to create a video automatically for our users. The videos consists of [images, captions, voiceover, background music, and animations) all generated by our AI tool and put together.

  


  Here's what we want as a video (dynamic, fast paced, and many animations) : https://drive.google.com/file/d/1ONCczJh_Uk9m6oRDPGFQYjJPWUhy8hdV/view?usp=sharing

  


  Here's what we're getting : https://drive.google.com/file/d/1sMKGB88ouTHsEdahc0Zyt8rKEvZWhTco/view?usp=sharing

  


  Thanks for any help here.