Xamarin Mac FFmpeg launch path not accessible

Question

I have a Xamarin Forms project with Mac support and I am trying to implement FFmpeg, so I have downloaded the Static build from its official page and added it as in the resources folder of the Mac project with the build action in Content, then I have created a service that will basically remove the audio from a video that I indicate in a path with a FFmpeg command, to do the service I have based on the following answer and I have adapted it to C #: https://stackoverflow.com/a/37422688/8496520

The problem is that when I try to execute the command I get the following error:

"NSInvalidArgumentException: launch path not accessible"

And I can't find out why this happens, I use the following code in the service (The error occurs when calling the Launch () method of the NSTask):

public void ExecuteFFmpeg()
{
    try
    {
        var launchPath = NSBundle.MainBundle.PathForResource("ffmpeg", ofType: "");
        var compressTask = new NSTask();
        compressTask.LaunchPath = launchPath;
        compressTask.Arguments = new string[] {
            "-i",
            "downloads/tyson.mp4",
            "-c",
            "copy",
            "-an",
            "nosound.mp4" };
        compressTask.StandardInput = NSFileHandle.FromNullDevice();
        compressTask.Launch();
        compressTask.WaitUntilExit();
    }
    catch (Exception ex)
    {

    }

I have also uploaded the project to GitHub in case someone needs to consult the repository in its entirety: https://github.com/nacompllo/FFmpegSample