TaskRunner/TaskRunner/TaskManager.cs

using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Threading.Tasks;

namespace TaskRunner
{
    public class TaskManager
    {
        public Task RunGnash(string src, string dest)
        {
            var task = new TaskCompletionSource<bool>();

            var process = new Process
            {
                StartInfo =
                {
                    FileName = "dump-gnash",
                    Arguments = $"-1 -D \"{dest}\" \"{src}\"",
                    RedirectStandardOutput = true,
                    UseShellExecute = false
                },
                EnableRaisingEvents = true
            };
            process.OutputDataReceived += (sender, a) => Console.WriteLine(a.Data);
            process.Start();
            process.Exited += (sender, args) =>
            {
                task.SetResult(true);
                process.Dispose();
            };
            return task.Task;
        }
        public Task swfRawToMp4(string src, string dest)
        {
            var task = new TaskCompletionSource<bool>();
            var process = new Process
            {
                StartInfo =
                {
                    FileName = "avconv",
                    Arguments = $"-f rawvideo -pix_fmt rgb32 -s:v 1024x576 -r 24 -i \"{src}\" -c:v libx264 -pix_fmt yuv420p \"{dest}\"",
                    RedirectStandardOutput = true,
                    UseShellExecute = false
                },
                EnableRaisingEvents = true
            };
            process.OutputDataReceived += (sender, a) => Console.WriteLine(a.Data);
            process.Start();
            process.BeginOutputReadLine();
            process.Exited += (sender, args) =>
            {
                task.SetResult(true);
                process.Dispose();
            };
            return task.Task;
        }

        public Task Mp4Join(IList<string> src, string dest)
        {
            var task = new TaskCompletionSource<bool>();
            var process = new Process
            {
                StartInfo =
                {
                    FileName = "avconv",
                    Arguments = $"-f rawvideo -pix_fmt rgb32 -s:v 1024x576 -r 24 -i \"{src}\" -c:v libx264 -pix_fmt yuv420p \"{dest}\"",
                    RedirectStandardOutput = true,
                    UseShellExecute = false
                },
                EnableRaisingEvents = true
            };
            process.OutputDataReceived += (sender, a) => Console.WriteLine(a.Data);
            process.Start();
            process.BeginOutputReadLine();
            process.Exited += (sender, args) =>
            {
                task.SetResult(true);
                process.Dispose();
            };
            return task.Task;
        }
    }
}