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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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• ffmpeg static link in Visual Studio [duplicate]

  24 avril 2019, par iz25

  This question already has an answer here :

  • What is an undefined reference/unresolved external symbol error and how do I fix it ?
    
    33 answers
    

  I have build ffmpeg static library on Windows. It seems that everything completed with success. The result of build are following files :

  libavcodec.a
  
  libavdevice.a
  
  libavfilter.a
  
  libavformat.a
  
  libavutil.a
  
  libswscale.a

  I tried to specify above files in Linker->Input in my C++ libray project, but linking fails. Following is build output :

  1>libavutil.a(samplefmt.o) : error LNK2001: unresolved external symbol ___stdio_common_vsprintf
  
  1>libavutil.a(error.o) : error LNK2001: unresolved external symbol ___stdio_common_vsprintf
  
  1>libavutil.a(log.o) : error LNK2001: unresolved external symbol ___stdio_common_vsprintf
  
  1>libavutil.a(utils.o) : error LNK2001: unresolved external symbol ___stdio_common_vsprintf
  
  1>libavutil.a(avstring.o) : error LNK2001: unresolved external symbol ___stdio_common_vsprintf
  
  1>libavutil.a(bprint.o) : error LNK2001: unresolved external symbol ___stdio_common_vsprintf
  
  1>libavformat.a(id3v2.o) : error LNK2001: unresolved external symbol ___stdio_common_vsprintf
  
  1>libavutil.a(opt.o) : error LNK2001: unresolved external symbol ___stdio_common_vsprintf
  
  1>libavutil.a(dict.o) : error LNK2001: unresolved external symbol ___stdio_common_vsprintf
  
  1>libavutil.a(pixdesc.o) : error LNK2001: unresolved external symbol ___stdio_common_vsprintf
  
  1>libavcodec.a(ratecontrol.o) : error LNK2001: unresolved external symbol ___stdio_common_vsprintf
  
  1>libavcodec.a(qsv.o) : error LNK2001: unresolved external symbol ___stdio_common_vsprintf
  
  1>libavformat.a(utils.o) : error LNK2001: unresolved external symbol ___stdio_common_vsprintf
  
  1>libavformat.a(aviobuf.o) : error LNK2001: unresolved external symbol ___stdio_common_vsprintf
  
  1>libavcodec.a(utils.o) : error LNK2001: unresolved external symbol ___stdio_common_vsprintf
  
  1>libavcodec.a(ffv1enc.o) : error LNK2001: unresolved external symbol ___stdio_common_vsprintf
  
  1>libavcodec.a(libvpxenc.o) : error LNK2001: unresolved external symbol ___stdio_common_vsprintf
  
  1>libavcodec.a(exif.o) : error LNK2001: unresolved external symbol ___stdio_common_vsprintf
  
  1>libavcodec.a(libvpxenc.o) : error LNK2001: unresolved external symbol _vpx_img_wrap
  
  1>libavcodec.a(libvpxenc.o) : error LNK2001: unresolved external symbol _vpx_codec_version_str
  
  1>libavcodec.a(libvpxdec.o) : error LNK2001: unresolved external symbol _vpx_codec_version_str
  
  1>libavcodec.a(libvpxenc.o) : error LNK2001: unresolved external symbol _vpx_codec_build_config
  
  1>libavcodec.a(libvpxdec.o) : error LNK2001: unresolved external symbol _vpx_codec_build_config
  
  1>libavcodec.a(libvpxenc.o) : error LNK2001: unresolved external symbol _vpx_codec_err_to_string
  
  1>libavcodec.a(libvpxenc.o) : error LNK2001: unresolved external symbol _vpx_codec_error
  
  1>libavcodec.a(libvpxdec.o) : error LNK2001: unresolved external symbol _vpx_codec_error
  
  1>libavcodec.a(libvpxenc.o) : error LNK2001: unresolved external symbol _vpx_codec_error_detail
  
  1>libavcodec.a(libvpxdec.o) : error LNK2001: unresolved external symbol _vpx_codec_error_detail
  
  1>libavcodec.a(libvpxenc.o) : error LNK2001: unresolved external symbol _vpx_codec_destroy
  
  1>libavcodec.a(libvpxdec.o) : error LNK2001: unresolved external symbol _vpx_codec_destroy
  
  1>libavcodec.a(libvpxenc.o) : error LNK2001: unresolved external symbol _vpx_codec_control_
  
  1>libavcodec.a(libvpxenc.o) : error LNK2001: unresolved external symbol _vpx_codec_enc_init_ver
  
  1>libavcodec.a(libvpxenc.o) : error LNK2001: unresolved external symbol _vpx_codec_enc_config_default
  
  1>libavcodec.a(libvpxenc.o) : error LNK2001: unresolved external symbol _vpx_codec_encode
  
  1>libavcodec.a(libvpxenc.o) : error LNK2001: unresolved external symbol _vpx_codec_get_cx_data
  
  1>libavcodec.a(libvpxenc.o) : error LNK2001: unresolved external symbol _vpx_codec_vp8_cx
  
  1>libavcodec.a(libvpxdec.o) : error LNK2001: unresolved external symbol _vpx_codec_dec_init_ver
  
  1>libavcodec.a(libvpxdec.o) : error LNK2001: unresolved external symbol _vpx_codec_decode
  
  1>libavcodec.a(libvpxdec.o) : error LNK2001: unresolved external symbol _vpx_codec_get_frame
  
  1>libavcodec.a(libvpxdec.o) : error LNK2001: unresolved external symbol _vpx_codec_vp8_dx_algo
  
  1>libavutil.a(opt.o) : error LNK2001: unresolved external symbol ___stdio_common_vsscanf
  
  1>libavutil.a(parseutils.o) : error LNK2001: unresolved external symbol ___stdio_common_vsscanf
  
  1>libavcodec.a(h264_sei.o) : error LNK2001: unresolved external symbol ___stdio_common_vsscanf
  
  1>libavcodec.a(ratecontrol.o) : error LNK2001: unresolved external symbol ___stdio_common_vsscanf
  
  1>libavcodec.a(qsv.o) : error LNK2001: unresolved external symbol ___stdio_common_vsscanf
  
  1>libavformat.a(id3v2.o) : error LNK2001: unresolved external symbol ___stdio_common_vsscanf
  
  1>libavutil.a(log.o) : error LNK2001: unresolved external symbol ___acrt_iob_func
  
  1>libavutil.a(log.o) : error LNK2001: unresolved external symbol ___stdio_common_vfprintf

  What could be missing here ?

• Is there a way to use EME with ClearKey encryption for HTML5 streaming protection ?

  7 juin 2016, par user1152226

  I am trying to understand EME with Clear Key encryption. I am using MP4Box. From the documentation here, you specify decryption keys in an XML file that is used to encrypt/decrypt your mp4 files.
  https://gpac.wp.mines-telecom.fr/mp4box/encryption/common-encryption/

  Basically, is there any point to EME with clear key encryption and is it possible to use this to protect content ?

  From my understanding, the encryption keys you specify in this XML, are the keys the clients need to use on the front end to decrypt the HTML5 audio/video streams. This means, at any time, the user could use a browser’s dev tools to get the keys.

  I suppose I could obfuscate the keys somehow, but anyone with determination would still be able to get the keys.

  The other thing I could possibly do, is combine this with stream links that expire, but that also wouldn’t project the keys.

  I think you could also re-encrypt the media periodically, or encrypt the file multiple times with different keys, but that doesn’t seem like it would scale well. Having a 1 time use key for each playback would be nice, but again, probably horribly inefficient.

  Here is an example of an XML config for specific encryption keys :

  <?xml version="1.0" encoding="UTF-8"?>
  
  <gpacdrm type="CENC AES-CTR">
  
  
  
  <drminfo type="pssh" version="1" cypheroffset="9" cypherkey="0x6770616363656E6364726D746F6F6C31" cypheriv="0x00000000000000000000000000000001">
  
  <bs id128="6770616363656E6364726D746F6F6C31"></bs>
  
  <bs value="2" bits="32"></bs>
  
  <bs id128="0x279926496a7f5d25da69f2b3b2799a7f"></bs>
  
  <bs id128="0x676cb88f302d10227992649885984045"></bs>
  
  <bs bits="8" string="CID=Toto"></bs>
  
  <bs id128="0xccc0f2b3b279926496a7f5d25da692f6"></bs>
  
  <bs id128="0xccc0f2b3b279926496a7f5d25da692d6"></bs>
  
  </drminfo>
  
  <cryptrack trackid="1" isencrypted="1" saisavedbox="senc">
  
  <key kid="0x279926496a7f5d25da69f2b3b2799a7f" value="0xccc0f2b3b279926496a7f5d25da692f6"></key>
  
  <key kid="0x676cb88f302d10227992649885984045" value="0xccc0f2b3b279926496a7f5d25da692d6"></key>
  
  </cryptrack>
  
  </gpacdrm>