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• How to convert ogg or mp3 file in wav without using ffmpeg

  3 août 2023, par Maksim Palchevski

  I have problems with installing ffmpeg and ffprobe that's why I am looking for ways to avoid them

  


  I have tried to ask neurolinks and even looked in Internet, but it is might to be impossible to install ffmpeg on that os that i have (nix os). So, i have tried to avoid it, but haven't found any solutions. Here is my code :

  


  from pydub import AudioSegment
def convert_audio_to_wav(input_file, output_file):
    # Читаем аудиофайл с помощью pydub
    x = AudioSegment.from_file(input_file)
    x.export(output_file, format='wav') 


  


  And it returns an error :

  


  [Errno 2] No such file or directory: 'ffprobe'


  


• ffmpeg convert 4K file to 1080p mp4 file

  16 septembre 2015, par Hüseyin GÖZE

  i’m using ffmpeg to converting video in windows service, when i’m trying to converting 4K video to 1080p ffmpeg returns error like this :

  libvo_aacenc Stream mapping : Stream #0:0 -> #0:0 (h264 (native) ->
  h264 (libx264)) Stream #0:2 -> #0:1 (ac3 (native) -> aac
  (libvo_aacenc)) Error while opening encoder for output stream #0:1 -
  maybe incorrect parameters such as bit_rate, rate, width or height

  my ffmpeg convert command like this :

  ffmpeg -i 4k2.mp4 -vf scale=1920:1080 -threads 3 4k2_1080.mp4

  what’s wrong with this ?

• FFmpeg error with ffmpeg.FS("readfile", "output.mp4"). trying to get ffmpeg to work in the react app

  21 juin 2024, par Paul Tham

   const stackVideos = useCallback(
    async (video1) => {
      try {
        console.log("Fetching video2 from storage...");
        const video2Ref = ref(storage, "video2.mp4");
        const video2Url = await getDownloadURL(video2Ref);
        const video2Blob = await (await fetch(video2Url)).blob();

        console.log("Writing video1 to FFmpeg FS...");
        await ffmpeg.FS("writeFile", "video1.mp4", await fetchFile(video1));

        console.log("Writing video2 to FFmpeg FS...");
        await ffmpeg.FS("writeFile", "video2.mp4", await fetchFile(video2Blob));

        console.log("Files in FFmpeg FS after write:");
        const files = await ffmpeg.FS("readdir", "/");
        console.log(files);

        const { start, end } = inputs[0];
        const startSeconds = new Date(`1970-01-01T${start}Z`).getTime() / 1000;
        const endSeconds = new Date(`1970-01-01T${end}Z`).getTime() / 1000;
        const duration = endSeconds - startSeconds;

        console.log("Running FFmpeg command...");
        await ffmpeg.run(
          "-i",
          "video1.mp4",
          "-ss",
          startSeconds.toString(),
          "-t",
          duration.toString(),
          "-i",
          "video2.mp4",
          "-filter_complex",
          "[0:v]scale=1080:-1[v1];[1:v]scale=-1:1920/2[v2scaled];[v2scaled]crop=1080:1920/2[v2cropped];[v1][v2cropped]vstack=inputs=2,scale=1080:1920[vid]",
          "-map",
          "[vid]",
          "-map",
          "0:a",
          "-c:v",
          "libx264",
          "-crf",
          "23",
          "-preset",
          "veryfast",
          "-shortest",
          "output1.mp4"
        );

        console.log("Files in FFmpeg FS after run:");
        const filesAfterRun = await ffmpeg.FS("readdir", "/");
        console.log(filesAfterRun);

        console.log("Reading output1.mp4 from FFmpeg FS...");
        const data = await ffmpeg.FS("readfile", "output1.mp4");
        console.log("after the FS readfile");
        const url = URL.createObjectURL(
          new Blob([data.buffer], { type: "video/mp4" })
        );
        setStackedVideo(url);
        setOutputFileReady(true); // Mark output file as ready
      } catch (err) {
        console.error("FFmpeg error output:", err);
        setError(`FFmpeg run error: ${err.message}`);
        setIsProcessing(false);
      }
    },
    [inputs]
  );


  


  My error seems to be stemming from this line :

  


   const data = await ffmpeg.FS("readfile", "output1.mp4");


  


  Seeing the ffmpeg.wasm documentation i thought the functions for some of the functions had changed, but when I changed it, it seemed like they did not recognise the new functions. Sometimes this will also give me some other errors like worker.js which I dont understand enough to debug this myself.

  


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