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• how can I read all file in a folder and compute PSNR for them using ffmpeg command as a batch file ?

  25 avril 2021, par david

  I have some videos that I encode them to mp4 file using FFmpeg, now I need to write a batch file that read all the file in a folder and compute PSNR for them and save in separate text file for each video. I used the following code for each video, but I have to write this command for each video and the number of videos is high. do you have any suggestions for this issue ?

  


  ffmpeg.exe -i input.mkv -i 2.mkv -lavfi psnr=stats_file=psnrmkv.txt -f null -


  


  I used this code to encode all files in a folder to mp4 format :

  


  for %%a in ("*.mp4") do ffmpeg.exe -i "%%a" -c:v  libx264 -pix_fmt yuv420p  -b:v 6000K -bufsize 6000K -minrate 6000K -maxrate 6000K -x264opts keyint=120:min-keyint=120 -preset veryfast -profile:v high output\%%~na.mp4"
pause


  


  but I do not know how can I write some this similar for computing psnr for all video files in a folder ?

  


• C# File.Move creates an empty file and IO exception

  30 novembre 2020, par Maddie

  My code processes a video file (using ffmpeg) and creates different qualities (360p, 480p, etc) and formats (mp4 and HLS) of that. After creating these files, I move all of them to another drive (a network location).

  


  my code looks Like this :

  


  var files = Directory.GetFiles(srcFolder);
string filename, destFile = string.Empty, srcFile = string.Empty;
try
{
    for (int i = 0; i < files.Length; i++)
    {
        srcFile = files[i];
        filename = Path.GetFileName(srcFile);
        destFile = Path.Combine(destFolder, filename);
        File.Move(srcFile, destFile);
    }
}
catch
{
    _logger.LogError("Error in moving file. srcFile: {0}, destFile: {1}", destFile, srcFile);
    throw;
}


  


  This process works fine most of the time, but for some files, I get an IO exception every time I run this process.

  


  


  System.IO.IOException : The file exists. at System.IO.FileSystem.MoveFile(String sourceFullPath, String destFullPath, Boolean overwrite)

  


  


  I made sure that destFolder does not exist before, nor did the destFile.

  


  After logging the error and finding the path of source and target files, I downloaded both of them. The source file is a .ts file with a size of 1,048 KB, and the target file is an empty file with the same name (0KB).

  


  This error happened multiple times with the same video, so I assume that it has something to do with the file itself. But I cannot figure it out.

  


• FFMPEG Incorrect File Output Path

  3 avril 2016, par Benny Chen

  I’am working in windows 7 32bit and trying to stream file with ffmpeg, but the output file keep going on wrong location.

  If I use this code :

  ffmpeg -i input -c:v copy -c:a copy output.mp4

  The output file will be saved in /Users/username

  If I use absolute path :

  ffmpeg -i input -c:v copy -c:a copy c:/output.mp4 

  or

  ffmpeg -i input -c:v copy -c:a copy "c:/output.mp4"

  It put the file in /Users/username/AppData/Local/VirtualStore

  So..it is weird and what the heck is the "VirtualStore" folder still a mystery....

  My question is simple, how to put output file in desired path location. Thanks.