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• Videos written with moviepy on amazon aws S3 are empty

  10 avril 2019, par cellistigs

  I am working on processing a dataset of large videos ( 100 GB) for a collaborative project. To make it easier to share data and results, I am keeping all videos remotely on an amazon S3 bucket, and processing it by mounting the bucket on an EC2 instance.

  One of the processing steps I am trying to do involves cropping the videos, and rewriting them into smaller segments. I am doing this with moviepy, splitting the video with the subclip method and calling :

  subclip.write_videofile("PathtoS3Bucket"+VideoName.split('.')[0]+'part' +str(segment)+ '.mp4',codec = 'mpeg4',bitrate = "1500k",threads = 2)

  I found that when the videos are too large (parameters set as above) calls to this function will sometimes generate empty files in my S3 bucket ( 10% of the time). Does anyone have insight into features of moviepy/ffmpeg/S3 that would lead to this ?

• AWS Lambda : how to give ffmpeg large files ?

  16 juin 2023, par Daniel Smith

  [Please note that this is now an old question, and that AWS has updated size limits. I would close it if there were an option of "no longer as relevant as when first posted".]

  


  Scenario :

  


  Using AWS Lambda (Node.js), I want to process large files from S3 ( > 1GB).
The /tmp fs limit of 512MB means that I can't copy the S3 input there.
I can certainly increase the Lambda memory space, in order to read in the files.

  


  

  • Do I pass the memory buffer to ffmpeg ? (node.js, how ?)

  


  • Or....should I just make an EFS mount point and use that as the transcoding scratchpad ?

  


  


• Large Video file Conversion using ffmpeg

  12 mai 2021, par Varsha

  I am using ffmpeg tool to convert videos from wmv to mp4 formats using the following code -

  


          string outputPath = args[1].ToString();
        string[] files = Directory.GetFiles(inputPath);               
        Console.WriteLine(files.Length);
        foreach (var item in files)
        {
            itemBkp = item;                                       
            Process proc = new Process();
            proc.StartInfo.FileName = @"e:\test\ffmpeg.exe";                   
            string filename= Path.GetFileName(item);                    
            proc.StartInfo.Arguments=  " -i "  + item + " " + outputPath + filename.Split('.')[0] + ".mp4";
            proc.StartInfo.UseShellExecute = false;
            proc.StartInfo.RedirectStandardInput = true;
            proc.StartInfo.RedirectStandardOutput = true;
            proc.Start();
            proc.WaitForExit();
        }


  


  It works fine for videos up to 20mb but when i try for videos above 70mb it throws following error -

  


  FFmpeg version SVN-r6179, Copyright (c) 2000-2004 Fabrice Bellard configuration : —extra-cflags=-I/static/include —extra-ldflags=-L/static/lib —enable-memalign-hack —enable-mp3lame —enable-xvid —enable-a52 —enable-libogg —enable-vorbis —enable-faac —enable-faad —enable-x264 —enable-pp —enable-amr_wb —enable-amr_nb —enable-avisynth —enable-gpl libavutil version : 49.0.0 libavcodec version : 51.13.0 libavformat version : 50.5.0 built on Sep 5 2006 22:41:30, gcc : 3.4.5 (mingw special) E :\videos\Playful : I/O error occured Usually that means that input file is truncated and/or corrupted.

  


  Is there a limit on video size to be converted ?