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• how can I set GOP size to be a multiple of the input framerate ?

  3 septembre 2020, par agconti

  Question :

  


  How can I set GOP size to be a multiple of the input framerate ?

  


  Context :

  


  My ideal GOP size formula is source_fps * 2. My source's framerate can be either 30 or 60 fps so I'm unable to set a static value that works for both. Is there a variable that ffmpeg exposes that I can use ? I know you can get metadata about the source input when using the -vf option with variables like iw or ih. Is there a similar method for FPS ?

  


  Example command where GOP size and keyint_min is hardcoded :

  


  ffmpeg -i <input /> -keyint_min 120 -g 120 -f dash /path/to/out.mpd&#xA;

  


  Desired command where e GOP size and keyint_min are based on the source framerate :

  


  ffmpeg -i <input /> -keyint_min source_framerate * 2 -g source_framerate * 2 -f dash /path/to/out.mpd&#xA;

  


• launch ffmpeg on Maui Android

  4 décembre 2024, par lolveley

  I have an Maui app which is deployed on an Android tablet, a Samsung tab S9 FE.
I have copied the ARM8 version of the ffmpeg executable in the AppDataDirectory of my deployed app. The executable, named "ffmpeg", has the rights _rwxrwxrwx (the underscore means this is a file, and not a directory).

  


  I try to execute the file with the command Process.Start :

  


  private void GetThumbnail(string inputFile, string imageFullPath, string ffmpegFullPath)
{
        ProcessStartInfo startInfo = new ProcessStartInfo();

        string arguments = $"-i {inputFile} -ss 00:01:00.000 -vframes 1 {imageFullPath}";

        startInfo.FileName = ffmpegFullPath;
        startInfo.CreateNoWindow = false;
        startInfo.UseShellExecute = false;
        startInfo.RedirectStandardError = true;
        startInfo.RedirectStandardOutput = true;
        startInfo.Arguments = arguments;

        try
        {
            Process process = Process.Start(startInfo);
            process.WaitForExit(5000);
            process.Close();
        }
        catch(Exception ex)
        {
            Console.WriteLine(ex.Message);
        }
}


  


  There is an exception saying the access is denied :

  


  


  System.ComponentModel.Win32Exception (13) : An error occurred trying to
start process '/data/user/0/sxb.explorateur.de.fichiers/files/ffmpeg'
with working directory '/data/data/sxb.explorateur.de.fichiers/files'.
Permission denied

  


  


  The error message doesn't say more, and I do not see what to do, the directory usually is dedicated to the application, and the file is executable.

  


  I know that Android has restricted policies with file execution, and maybe it's even harder for the Samsung operating system, namely One UI 6.1.1 and Android 14.

  


  thank you.

  


• Ffmpeg sbs 3d mkv to 3d baked into 2d video

  27 octobre 2020, par goodkid38

  I have a couple of 3d blu-ray rips I'd like to stream to a tv that is not 3d compatible. I have a samsung smart tv with an app that I made to stream the video locally. I'm using ffmpeg on my backend to transcode video. I'm curoius to see if ffmpeg can take a 3d sbs mkv and bake the 3d elements into a 2d image. That way the stream is still 3d even on non-compatible devices.