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• ffprobe can not read a file generated by node JS createWriteStream() on AWS

  30 septembre 2016, par matthiasdv

  I have a setup running on AWS that triggers an AWS Lambda function when a video file is uploaded to an S3 bucket. The Lambda function is written in node and downloads the file, streams it to a temp working file and then executes ffprobe on it followed by an ffmpeg command.

  ffprobe throws the following error :

  [mov,mp4,m4a,3gp,3g2,mj2 @ 0x4ea8e20] error reading header download: Invalid data found when processing input

  The bug is hard to reproduce and occurs only half the time, which I believe to be because of the async nature of the program.

  My main function is as follows

  downloadFile(library.getDownloadStream, logger, sourceLocation, localFilePath)
  
          .then(() => ffprobe(logger))
  
          .then(() => ffmpeg(logger, keyPrefix))
  
          .then(() => removeDownload(logger, localFilePath))
  
          .then(() => uploadFiles(library.uploadToBucket, logger, keyPrefix))
  
          .then(data => invocation.callback())
  
          .catch(error => invocation.callback(error));

  The ffprobe Function :

  function downloadFile(downloadFunc, logger, sourceLocation, download) {
  
      return new Promise((resolve, reject) => {
  
          logger.log(`Starting download: ${sourceLocation.bucket} / ${sourceLocation.key}`);
  
  
  
          var downloadFile = createWriteStream(download);
  
  
  
          downloadFunc(sourceLocation.bucket, sourceLocation.key)
  
              .on('end', () => {
  
                  logger.log("closing writing stream");
  
                  downloadFile.end();
  
  
  
                  logger.log('Download finished');
  
  
  
                  resolve();
  
              })
  
              .on('error', reject)
  
              .pipe(downloadFile);
  
      });
  
  }

  Each build/update uploads the latest ffmpeg version to AWS. I can not reproduce this error locally.

  Why is ffprobe throwing this error regarding the header ?

  Update

  Logging the downloaded file’s filesize prints exactly the same amount of bytes, regardless of wether ffprobe is successful or not.

  However, when I set a timeOut before resolving the promise, the bug no longer occurs and ffprobe runs successfully each time :

  downloadFunc(sourceLocation.bucket, sourceLocation.key)
  
          .on('end', () => {
  
  
  
              logger.log('Download finished');
  
  
  
              // Filesize
  
              var meta = fs.statSync(download);
  
              var fileSizeInBytes = meta["size"];
  
  
  
              logger.log(fileSizeInBytes);
  
  
  
              // resolve();
  
              setTimeout(resolve, 1000); 
  
          })
  
          .on('error', reject)
  
          .pipe(downloadFile);

  Why is this happening ?

• Convert HLS stream to mp4 with Java [closed]

  18 avril 2017, par Wessel Oosthuizen

  I have a requirement to convert a HLS (m3u8) stream to something I can download from a web browser, with Java. Currently I play video clips via a remote HLS stream in the browser using video.js. But I can’t take that URL and grab the bytes for the end user to download it, like I can if it was a mp4 stream.

  I found the question below, which makes it seem possible using ffmpeg command line. I am familiar with the javacv library and FrameGrabber, etc... But I can’t figure out how to apply that library to this case.

  Converting an HLS (m3u8) to MP4

  Any ideas ?

  Thanks

• ffmpeg installation on macOS for MoviePy fails with SSL error

  26 juillet 2018, par shmible

  I’m trying to write a Python program that uses MoviePy on Mac OS 10.11.16 to convert an MP4 file to GIF. I use :

  import moviepy.editor as mp

  and I get an error saying I need to call imageio.plugins.ffmpeg.download() so I can download ffmpeg. I use :

  import imageio
  
  imageio.plugins.ffmpeg.download()

  which gives me the following error :

  Imageio: 'ffmpeg.osx' was not found on your computer; downloading it now.
  
  Error while fetching file: <urlopen error="error" certificate="certificate" verify="verify" failed="failed">.
  
  Error while fetching file: <urlopen error="error" certificate="certificate" verify="verify" failed="failed">.
  
  Error while fetching file: <urlopen error="error" certificate="certificate" verify="verify" failed="failed">.
  
  Error while fetching file: <urlopen error="error" certificate="certificate" verify="verify" failed="failed">.
  
  Traceback (most recent call last):
  
    File "", line 1, in <module>
  
      imageio.plugins.ffmpeg.download()
  
    File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/imageio/plugins/ffmpeg.py", line 55, in download
  
      get_remote_file('ffmpeg/' + FNAME_PER_PLATFORM[plat])
  
    File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/imageio/core/fetching.py", line 121, in get_remote_file
  
      _fetch_file(url, filename)
  
    File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/imageio/core/fetching.py", line 177, in _fetch_file
  
      os.path.basename(file_name))
  
  OSError: Unable to download 'ffmpeg.osx'. Perhaps there is a no internet connection? If there is, please report this problem.
  
  </module></urlopen></urlopen></urlopen></urlopen>

  I definitely have an internet connection. I found this link, and tried installing with Homebrew and Static builds, but neither have worked. It seems like compiling it myself would be a little too advanced for me (I’ve only briefly looked into it). I used imageio.plugins.ffmpeg.download() on IDLE. I read something about using PyCharm to run the MoviePy code, but I get the same initial error. ffmpeg is currently in my /usr/local/bin folder. Any suggestions are welcome. Thank for your help.

  Edit : I’m using Python 3.6.1