public Task ProcessAsync(IReadOnlyList <string> inputFilePaths,
string outputFilePath, string format, bool transcode, IEnumerable <string> additionalArgs = null,
IProgress <double> progress = null, CancellationToken cancellationToken = default(CancellationToken))
{
var args = new List <string>();
// Set input files
foreach (var inputFilePath in inputFilePaths)
{
args.Add($"-i \"{inputFilePath}\"");
}
// Set output format
args.Add($"-f {format}");
// Skip transcoding if it's not required
if (!transcode)
{
args.Add("-c copy");
}
// Optimize mp4 transcoding
if (transcode && string.Equals(format, "mp4", StringComparison.OrdinalIgnoreCase))
{
args.Add("-preset ultrafast");
}
// Set max threads
args.Add($"-threads {Environment.ProcessorCount}");
// Disable stdin so that the process will not hang waiting for user input
args.Add("-nostdin");
// Trim streams to shortest
args.Add("-shortest");
if (additionalArgs != null)
{
args.AddRange(additionalArgs);
}
// Overwrite files
args.Add("-y");
// Set output file
args.Add($"\"{outputFilePath}\"");
// Set up progress router
var progressRouter = new FfmpegProgressRouter(progress);
// Run CLI
return(Cli.Wrap(_ffmpegFilePath)
.WithWorkingDirectory(Directory.GetCurrentDirectory())
.WithArguments(args.JoinToString(" "))
.WithStandardErrorPipe(PipeTarget.ToDelegate((line) => progressRouter.ProcessLine(line))) // handle stderr to parse and route progress
.WithValidation(CommandResultValidation.None) // disable stderr validation because ffmpeg writes progress there
.ExecuteAsync(cancellationToken));
}
public Task ProcessAsync(IReadOnlyList <string> inputFilePaths,
string outputFilePath, string format, bool transcode,
IProgress <double>?progress = null, CancellationToken cancellationToken = default)
{
var args = new List <string>();
// Set input files
foreach (var inputFilePath in inputFilePaths)
{
args.Add($"-i \"{inputFilePath}\"");
}
// Set output format
args.Add($"-f {format}");
// Skip transcoding if it's not required
if (!transcode)
{
args.Add("-c copy");
}
//args.Add("libx264");
// Optimize mp4 transcoding
if (transcode && string.Equals(format, "mp4", StringComparison.OrdinalIgnoreCase))
{
args.Add("-preset veryfast");
}
// Set max threads
args.Add($"-threads {Environment.ProcessorCount}");
// Disable stdin so that the process will not hang waiting for user input
args.Add("-nostdin");
// Trim streams to shortest
args.Add("-shortest");
// Overwrite files
args.Add("-y");
// Set output file
args.Add($"\"{outputFilePath}\"");
// Set up progress router
var progressRouter = new FfmpegProgressRouter(progress);
// Run CLI
return(new Cli(_ffmpegFilePath)
.SetWorkingDirectory(Directory.GetCurrentDirectory())
.SetArguments(args.JoinToString(" "))
.SetStandardErrorCallback(progressRouter.ProcessLine) // handle stderr to parse and route progress
.SetCancellationToken(cancellationToken)
.EnableExitCodeValidation()
.EnableStandardErrorValidation(false) // disable stderr validation because ffmpeg writes progress there
.ExecuteAsync());
}