IL2CPP Issue when running ffmpeg from a process()

Hi,

I seem to be having a bit of a strange issue with IL2CPP. Basiclly I've been spinning up and an instance of ffmpeg from unity to render sets of pngs into videos. This has been working fine but since I updated to 2019.3, I've had issues. It works fine from the editor but when I make a windows build it doesn't work and I get this error in the player.log file:



It looks like there is an issue with IL2CPP so I switched the scripting backend to Mono and now its working again.

Is this maybe an issue with IL2CPP or is it maybe an implementation thing where it needs to be done differently?

Here is the code I'm using to to fire up ffmpeg:

Code (CSharp):

1. private void PrepFfmpeg()
2.     {
3.         // Define the ffmpeg command based on the config file
4.         var command = AA_Tools.GetConfigFile("ffmpeglocation", @"C:\Export\ffmpeg.exe");
5.  
6.         var arguments = GetFfmpegArguments();
7.  
8.         Debug.Log("Running command: \n" + command + "\n with parameters \n" + arguments);
9.  
10.         RunFfmpeg(command, arguments);
11.     }
12.  
13.  
14.     // Time the process
15.     Stopwatch processStopwatch = new Stopwatch();
16.     StringBuilder sb = new StringBuilder();
17.  
18.     private void RunFfmpeg(string command, string arguments)
19.     {
20.         sb = new StringBuilder();
21.         var p = new Process();
22.  
23.         // Assign temporary cache
24.         var workingDirectory = "";
25.         p.StartInfo.WorkingDirectory = !string.IsNullOrEmpty(workingDirectory) ? workingDirectory : Application.temporaryCachePath;
26.        
27.         p.StartInfo = new System.Diagnostics.ProcessStartInfo();
28.         p.StartInfo.UseShellExecute = false;
29.         p.StartInfo.CreateNoWindow = true;
30.         p.EnableRaisingEvents = true;
31.        
32.         p.Exited += new EventHandler(OnProcessExit);
33.         p.StartInfo.FileName = @command;
34.         p.StartInfo.Arguments = " " +  @arguments;
35.        
36.         // redirect the output
37.         p.StartInfo.RedirectStandardOutput = true;
38.         p.StartInfo.RedirectStandardError = true;
39.        
40.         // hookup the eventhandlers to capture the data that is received
41.         p.OutputDataReceived += (sender, args) => sb.AppendLine(args.Data);
42.         p.ErrorDataReceived += (sender, args) => sb.AppendLine(args.Data);
43.        
44.         processStopwatch.Start();
45.  
46.         p.Start();
47.         // start our event pumps
48.         p.BeginOutputReadLine();
49.         p.BeginErrorReadLine();
50.     }
51.  
52.     private void OnProcessExit(object sender, EventArgs e)
53.     {
54.         processStopwatch.Stop();
55.  
56.         Debug.Log("successfully ran. time elapsed: " + processStopwatch.ElapsedMilliseconds);
57.  
58.         // Set the status to Successful
59.         m_ExportSettings.currentProgress = RenderJobStatus.Success;
60.  
61.         Debug.Log("Ffmpeg output: \n" + sb.ToString());
62.     }

 

Ah okay cool, thanks for replying

Is this something that might get added at some point?

 

Great, thanks for the clarity