I happened to find this answer: https://stackoverflow.com/questions/44981454/c-sharp-extract-mp3-file-from-mp4-file#=
And it seems to work, However, the conversion process gets stuck, and it only resumes after I have closed the application that called ffmpeg to run.
The following code is responsible for the launch of ffmpeg: (The commented lines are just from testing on how to fix the hanging)
public static string ConvertToMp3(string inputFile, string outputFile = "extracted_audio.mp3")
{
Console.WriteLine("Converting mp3 to " + Path.GetFullPath("extracted_audio.mp3"));
string mp3out = "";
try
{
if (ffmpegProcess != null)
ffmpegProcess.Kill();
ffmpegProcess = new Process();
ffmpegProcess.StartInfo.UseShellExecute = false;
ffmpegProcess.StartInfo.RedirectStandardInput = true;
ffmpegProcess.StartInfo.RedirectStandardOutput = true;
ffmpegProcess.StartInfo.RedirectStandardError = true;
ffmpegProcess.StartInfo.CreateNoWindow = true;
ffmpegProcess.StartInfo.FileName = Path.GetDirectoryName(System.Diagnostics.Process.GetCurrentProcess().MainModule.FileName) + @"\bin\ffmpeg.exe";
ffmpegProcess.StartInfo.Arguments = "-i " + Path.GetFullPath(inputFile) + " -vn -f mp3 -ab 320k output " + Path.GetFullPath(outputFile);
ffmpegProcess.Start();
ffmpegProcess.StandardOutput.ReadToEnd();
mp3out = ffmpegProcess.StandardError.ReadToEnd();
//ffmpegProcess.WaitForExit();
if (!ffmpegProcess.HasExited)
{
//ffmpegProcess.Kill();
}
}
catch (InvalidOperationException e)
{
Console.WriteLine("mp3 conversion failed: " + e.Message);
return "";
}
return mp3out;
}
I have no idea what causes the halting, any ideas?
