/// <summary>
/// Converts to low-quality, small video
/// </summary>
/// <param name="maxSeconds">0 if you don't want to truncate at all</param>
/// <returns>log of the run</returns>
public static ExecutionResult MakeLowQualitySmallVideo(string inputPath, string outputPath, int maxSeconds, IProgress progress)
{
if (string.IsNullOrEmpty(LocateAndRememberFFmpeg()))
{
return new ExecutionResult() { StandardError = "Could not locate FFMpeg" };
}
// isn't working: var arguments = "-i \"" + inputPath + "\" -vcodec mpeg4 -s 160x120 -b 800 -acodec libmp3lame -ar 22050 -ab 32k -ac 1 \"" + outputPath + "\"";
var arguments = "-i \"" + inputPath +
"\" -vcodec mpeg4 -s 160x120 -b 800 -acodec libmp3lame -ar 22050 -ab 32k -ac 1 ";
if (maxSeconds > 0)
arguments += " -t " + maxSeconds + " ";
arguments += "\"" + outputPath + "\"";
progress.WriteMessage("ffmpeg " + arguments);
var result = CommandLineProcessing.CommandLineRunner.Run(LocateAndRememberFFmpeg(),
arguments,
Environment.CurrentDirectory,
60 * 10, //10 minutes
progress
);
progress.WriteVerbose(result.StandardOutput);
//hide a meaningless error produced by some versions of liblame
if (result.StandardError.Contains("lame: output buffer too small")
&& File.Exists(outputPath))
{
result = new ExecutionResult
{
ExitCode = 0,
StandardOutput = result.StandardOutput,
StandardError = string.Empty
};
}
if (result.StandardError.ToLower().Contains("error") //ffmpeg always outputs config info to standarderror
|| result.StandardError.ToLower().Contains("unable to")
|| result.StandardError.ToLower().Contains("invalid")
|| result.StandardError.ToLower().Contains("could not"))
progress.WriteWarning(result.StandardError);
return result;
}
/// <summary>
/// Converts to low-quality, mono mp3
/// </summary>
/// <returns>log of the run</returns>
public static ExecutionResult MakeLowQualityCompressedAudio(string inputPath, string outputPath, IProgress progress)
{
if (string.IsNullOrEmpty(LocateAndRememberFFmpeg()))
{
return new ExecutionResult() { StandardError = "Could not locate FFMpeg" };
}
var arguments = "-i \"" + inputPath + "\" -acodec libmp3lame -ac 1 -ar 8000 \"" + outputPath + "\"";
progress.WriteMessage("ffmpeg " + arguments);
var result = CommandLineProcessing.CommandLineRunner.Run(LocateAndRememberFFmpeg(),
arguments,
Environment.CurrentDirectory,
60 * 10, //10 minutes
progress
);
progress.WriteVerbose(result.StandardOutput);
//hide a meaningless error produced by some versions of liblame
if (result.StandardError.Contains("lame: output buffer too small")
&& File.Exists(outputPath))
{
result = new ExecutionResult
{
ExitCode = 0,
StandardOutput = result.StandardOutput,
StandardError = string.Empty
};
}
if (result.StandardError.ToLower().Contains("error")
|| result.StandardError.ToLower().Contains("unable to")
|| result.StandardError.ToLower().Contains("invalid")
|| result.StandardError.ToLower().Contains("could not")
) //ffmpeg always outputs config info to standarderror
progress.WriteError(result.StandardError);
return result;
}
/// <summary>
/// Extracts the audio from a video. Note, it will fail if the file exists, so the client
/// is responsible for verifying with the user and deleting the file before calling this.
/// </summary>
/// <param name="inputPath"></param>
/// <param name="outputPath"></param>
/// <param name="audioCodec">e.g. copy, pcm_s16le, pcm_s32le, etc.</param>
/// <param name="sampleRate">e.g. 22050, 44100, 4800. Use 0 to use ffmpeg's default</param>
/// <param name="channels">0 for same, 1 for mono, 2 for stereo</param>
/// <param name="progress"></param>
/// <returns>log of the run</returns>
private static ExecutionResult ExtractAudio(string inputPath, string outputPath,
string audioCodec, int sampleRate, int channels, IProgress progress)
{
if (string.IsNullOrEmpty(LocateFFmpeg()))
{
return new ExecutionResult() { StandardError = "Could not locate FFMpeg" };
}
var sampleRateArg = "";
if (sampleRate > 0)
sampleRateArg = string.Format("-ar {0}", sampleRate);
//TODO: this will output whatever mp3 or wav or whatever is in the video... might not be wav at all!
var channelsArg = "";
if (channels > 0)
channelsArg = string.Format(" -ac {0}", channels);
var arguments = string.Format("-i \"{0}\" -vn -acodec {1} {2} {3} \"{4}\"",
inputPath, audioCodec, sampleRateArg, channelsArg, outputPath);
progress.WriteMessage("ffmpeg " + arguments);
var result = CommandLineProcessing.CommandLineRunner.Run(LocateAndRememberFFmpeg(),
arguments,
Environment.CurrentDirectory,
60 * 10, //10 minutes
progress);
progress.WriteVerbose(result.StandardOutput);
//hide a meaningless error produced by some versions of liblame
if (result.StandardError.Contains("lame: output buffer too small")
&& File.Exists(outputPath))
{
var doctoredResult = new ExecutionResult
{
ExitCode = 0,
StandardOutput = result.StandardOutput,
StandardError = string.Empty
};
return doctoredResult;
}
if (result.StandardError.ToLower().Contains("error")) //ffmpeg always outputs config info to standarderror
progress.WriteError(result.StandardError);
return result;
}
/// <summary>
/// Creates an audio file, using the received one as the bases, with the specified number
/// of channels. For example, this can be used to convert a 2-channel audio file to a
/// single channel audio file.
/// </summary>
/// <returns>log of the run</returns>
public static ExecutionResult ChangeNumberOfAudioChannels(string inputPath,
string outputPath, int channels, IProgress progress)
{
if (string.IsNullOrEmpty(LocateFFmpeg()))
return new ExecutionResult { StandardError = "Could not locate FFMpeg" };
var arguments = string.Format("-i \"{0}\" -vn -ac {1} \"{2}\"",
inputPath, channels, outputPath);
var result = CommandLineRunner.Run(LocateAndRememberFFmpeg(),
arguments,
Environment.CurrentDirectory,
60 * 10, //10 minutes
progress);
progress.WriteVerbose(result.StandardOutput);
//hide a meaningless error produced by some versions of liblame
if (result.StandardError.Contains("lame: output buffer too small") && File.Exists(outputPath))
{
var doctoredResult = new ExecutionResult
{
ExitCode = 0,
StandardOutput = result.StandardOutput,
StandardError = string.Empty
};
return doctoredResult;
}
// ffmpeg always outputs config info to standarderror
if (result.StandardError.ToLower().Contains("error"))
progress.WriteError(result.StandardError);
return result;
}
/// <summary>
/// use this one if you're doing a long running task that you'll have running in a thread, so that you need a way to abort it
/// </summary>
public ExecutionResult Start(string exePath, string arguments, Encoding encoding, string fromDirectory, int secondsBeforeTimeOut, IProgress progress, Action<string> actionForReportingProgress, string standardInputPath = null)
{
progress.WriteVerbose("running '{0} {1}' from '{2}'", exePath, arguments, fromDirectory);
ExecutionResult result = new ExecutionResult();
result.Arguments = arguments;
result.ExePath = exePath;
using (_process = new Process())
{
_process.StartInfo.RedirectStandardError = true;
_process.StartInfo.RedirectStandardOutput = true;
_process.StartInfo.UseShellExecute = false;
_process.StartInfo.CreateNoWindow = true;
_process.StartInfo.WorkingDirectory = fromDirectory;
_process.StartInfo.FileName = exePath;
_process.StartInfo.Arguments = arguments;
if (encoding != null)
{
_process.StartInfo.StandardOutputEncoding = encoding;
}
if (actionForReportingProgress != null)
_processReader = new AsyncProcessOutputReader(_process, progress, actionForReportingProgress);
else
_processReader = new SynchronousProcessOutputReader(_process, progress);
if (standardInputPath != null)
_process.StartInfo.RedirectStandardInput = true;
try
{
Debug.WriteLine("CommandLineRunner Starting at " + DateTime.Now.ToString());
_process.Start();
if (standardInputPath != null)
{
var myWriter = _process.StandardInput.BaseStream;
var input = File.ReadAllBytes(standardInputPath);
myWriter.Write(input, 0, input.Length);
myWriter.Close(); // no more input
}
}
catch (Win32Exception error)
{
throw;
}
if (secondsBeforeTimeOut > TimeoutSecondsOverrideForUnitTests)
secondsBeforeTimeOut = TimeoutSecondsOverrideForUnitTests;
bool timedOut = false;
Debug.WriteLine("CommandLineRunner Reading at " + DateTime.Now.ToString("HH:mm:ss.ffff"));
if (!_processReader.Read(secondsBeforeTimeOut))
{
timedOut = !progress.CancelRequested;
try
{
if (_process.HasExited)
{
progress.WriteWarning("Process exited, cancelRequested was {0}", progress.CancelRequested);
}
else
{
if (timedOut)
progress.WriteWarning("({0}) Timed Out...", exePath);
progress.WriteWarning("Killing Process ({0})", exePath);
_process.Kill();
}
}
catch (Exception e)
{
progress.WriteWarning(
"Exception while killing process, as though the process reader failed to notice that the process was over: {0}",
e.Message);
progress.WriteWarning("Process.HasExited={0}", _process.HasExited.ToString());
}
}
result.StandardOutput = _processReader.StandardOutput;
result.StandardError = _processReader.StandardError;
if (timedOut)
{
result.StandardError += Environment.NewLine + "Timed Out after waiting " + secondsBeforeTimeOut +
" seconds.";
result.ExitCode = ExecutionResult.kTimedOut;
}
else if (progress.CancelRequested)
{
result.StandardError += Environment.NewLine + "User Cancelled.";
result.ExitCode = ExecutionResult.kCancelled;
}
else
{
result.ExitCode = _process.ExitCode;
}
}
return result;
}