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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 ?

• ffmpeg_kit_flutter_full_gpl，aken down from the official platform，ffmpeg-kit-full-gpl-6.0-ios-xcframework.zip

  20 avril, par marsdiscovery

  Important plugins for Flutter : ffmpeg_kit_flutter_full_gpl， It has been taken down from the official platform and is no longer under maintenance.
Error message during use :
-> Installing ffmpeg-kit-ios-full-gpl (6.0)

  


  


  Http download
$ /usr/bin/curl -f -L -o /var/folders/b8/thh68v8j4nqfhsjg7x4pv7140000gn/T/d20250420-81226-c8wqz2/file.zip https://github.com/arthenica/ffmpeg-kit/releases/download/v6.0/ffmpeg-kit-full-gpl-6.0-ios-xcframework.zip —create-dirs —netrc-optional —retry 2 -A 'CocoaPods/1.15.2 cocoapods-downloader/2.1'

  


  


  [!] Error installing ffmpeg-kit-ios-full-gpl
[!] /usr/bin/curl -f -L -o /var/folders/b8/thh68v8j4nqfhsjg7x4pv7140000gn/T/d20250420-81226-c8wqz2/file.zip https://github.com/arthenica/ffmpeg-kit/releases/download/v6.0/ffmpeg-kit-full-gpl-6.0-ios-xcframework.zip —create-dirs —netrc-optional —retry 2 -A 'CocoaPods/1.15.2 cocoapods-downloader/2.1'

  


  This file does indeed no longer exist.

  


  Our app heavily relies on ffmpeg_kit_flutter_full_gpl. What should we do now.

  


  Please help me, everyone

  


  I also tried pulling the source code locally, but it still reported the same error

  


• ffmpeg split | merge video voice not sync

  2 août 2022, par Zhang

  there are what i done :

  


  

  1. download a full mp4 file.

  


  2. due to it's watermark(0s-10s), i split the full video into 2 parts from 10second. the first part with watermark.

  


  3. use ffmpeg delogo the first part.

  


  4. merge the two video into a full again.

  


  


  


  wget -O download.mp4
ffmpeg -i download.mp4 -vcodec copy -acodec copy -t 00:00:10 tmp1.mp4
ffmpeg -i download.mp4 -vcodec copy -acodec copy -ss 00:00:10 tmp2.mp4
ffmpeg -i tmp1.mp4 -vf "delogo=x=432:y=44:w=1060:h=108" -c:a copy tmp3.mp4
echo file tmp3.mp4 > mergelist.txt && echo file tmp2.mp4 >> mergelist.txt
ffmpeg -f concat -i mergelist.txt -c copy output.mp4


  


  


  problem i faced :
in the last merged video, only one tmp part is fine, the other's video and voice not sync and play time more faster than before.

  


  why i divide it, delogo(although only the first 10 seconds shows) full video more than 1h, re-encode takes much time, 10s part fine to me.