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• 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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• .NET Wrapper ffmpeg convert to mp4 set size to 1920 x 1080

  1er août 2020, par Robert

  I in my application written in .NET Core I use ffmpeg to convert movie from 3gp to mp4.

  


  var conversionOptions = new ConversionOptions
{
   MaxVideoDuration = TimeSpan.FromSeconds(60),
   VideoAspectRatio = VideoAspectRatio.R16_9,
   VideoSize = VideoSize.Hd1080,
   AudioSampleRate = AudioSampleRate.Hz44100,
   //  CustomWidth = 200
};
                    
await ffmpeg.ConvertAsync(inputFile, outputFileMp4, conversionOptions);


  


  Convertion works fine, but my source movie is from mobile phone. Its frame size is 1920 x 1080 but the movie is higher than wider.
After conversion with above code the frame is the same but the movie is cuted and it is wider than taller.
I wanted to have original size

  


• How to force ffmpeg to use all the images in a directory ?

  7 septembre 2016, par Learnaholic

  I have a directory of images, (*.png)s, and I am trying to make a movie out of them using ffmpeg.

  The images are named in multiple of 50, so I have : images_0000.png, then, images_0050.png, then images_0100.png, then images_0150.png, etc, all the way to images_4950.png, and so I have 100 images in total.

  I use the following command to make my movie :

  ffmpeg -r 10 -pattern_type glob -i '*.png' -c:v libx264 movie.mp4

  This works fine to make the movie, however when I play it, does not look like every image is being used. That is, if I step through frame by frame, I see that some images are not being displayed, and it looks like they were skipped. (I know because every image has it’s name written on it).

  So, how do I force ffmpeg to use every image in the directory, such that every step forward in the movie, will show the corresponding image ?

  Thanks.

  EDIT : Here is the complete screen dump of the command :