public async Task DoJob(Job job, Action <IParallelProgress> progressUpdate, CancellationToken cancellation)
{
tasksLimit = new SemaphoreSlim(2);
var groups = job.FileGroups.ToList();
var error = groups.Join(job.Files, g => g.FilePath, f => f.FilePath, (g, f) => g.FilePath).ToList();
if (error.Any())
{
throw new ArgumentException("Some output file names are the same as one of inputs:\r\n" + string.Join("\r\n", error.Select(s => " " + s)));
}
var tasks = new List <Task>();
var progress = new ParallelProgressContainer(progressUpdate);
foreach (var step in groups)
{
Task task;
var subprogress = new ParallelProgressContainer();
progress.Add(subprogress);
task = ConcatMultipleFiles(step, subprogress, cancellation);
tasks.Add(task);
}
await Task.WhenAll(tasks.ToArray());
}
private async Task ConcatMultipleFiles(FilesGroup step, ParallelProgressContainer progress, CancellationToken cancellation)
{
var outputFormat = step.OutputEncoding ?? "-c copy";
var concatFile = await CreateConcatFile(step.Files);
try
{
var subProgress = new ParallelProgressChild();
progress.Add(subProgress);
try
{
await tasksLimit.WaitAsync(cancellation);
string arguments = $"-f concat -safe 0 -i \"{concatFile}\" {outputFormat} -y \"{step.FilePath}\"";
using (var proc = StartProcess(
FFMpegPath,
str => UpdateProgress(str, subProgress),
cancellation,
arguments))
{
await proc;
}
}
finally
{
tasksLimit.Release();
}
}
finally
{
File.Delete(concatFile);
}
}
private async Task ConcatFilesComplex(FilesGroup step, ParallelProgressContainer progress, List <string> concatFiles, CancellationToken cancellation)
{
var subProgress = new ParallelProgressChild();
progress.Add(subProgress);
try
{
await tasksLimit.WaitAsync(cancellation);
var inputFiles = string.Join(" ", concatFiles.Select(f => $"-i \"{f}\""));
var filterParts = string.Join(string.Empty, concatFiles.Select((s, i) => step.ComplexFilter.Replace("%i", i.ToString())));
var streamParts = string.Join(string.Empty, concatFiles.Select((s, i) => $"[v{i}][{i}:a]"));
var filter = $"-filter_complex \"{filterParts} {streamParts}concat=n={concatFiles.Count}:v=1:a=1[v][a]\" -map \"[v]\" -map \"[a]\"";
var argument = $"{inputFiles} {filter} {step.OutputEncoding} -y \"{step.FilePath}\"";
using (var proc = StartProcess(
FFMpegPath,
str => UpdateProgress(str, subProgress, 0.5),
cancellation,
argument))
{
await proc;
}
}
finally
{
tasksLimit.Release();
}
}
private async Task ConcatFilesSimple(FilesGroup step, ParallelProgressContainer progress, List <string> concatFiles, string outputFormat, CancellationToken cancellation)
{
var concatFile = await CreateConcatFile(concatFiles);
try
{
var subProgress = new ParallelProgressChild();
progress.Add(subProgress);
try
{
await tasksLimit.WaitAsync(cancellation);
using (var proc = StartProcess(
FFMpegPath,
str => UpdateProgress(str, subProgress, 0.5),
cancellation,
$"-f concat -safe 0 -i \"{concatFile}\" {outputFormat} -y \"{step.FilePath}\""))
{
await proc;
}
}
finally
{
tasksLimit.Release();
}
}
finally
{
File.Delete(concatFile);
}
}
private async Task ConcatMultipleFiles(FilesGroup step, ParallelProgressContainer progress, CancellationToken cancellation)
{
var outputFormat = step.OutputEncoding ?? "-c copy";
var concatFiles = new List <string>();
var tasks = new List <Task>();
var filesToDelete = new List <string>();
var doneLock = new object();
try
{
foreach (var file in step.Files)
{
cancellation.ThrowIfCancellationRequested();
if (Math.Abs(file.CutDuration - file.Duration) < 0.001)
{
concatFiles.Add(file.FilePath);
}
else
{
var newfile = Path.GetTempFileName() + Path.GetExtension(step.FilePath);
var tempargs = $"-i \"{file.FilePath}\" -ss {file.Start} -t {file.CutDuration} -c copy -y \"{newfile}\"";
Debug.WriteLine(tempargs);
var cutprogress = new ParallelProgressChild();
progress.Add(cutprogress);
await tasksLimit.WaitAsync(cancellation);
var tempproc = StartProcess(FFMpegPath, str => UpdateProgress(str, cutprogress, 0.5), cancellation, tempargs);
var fileCutDuration = file.CutDuration;
var task = tempproc.ContinueWith(
t =>
{
t.Result.Dispose();
tasksLimit.Release();
},
cancellation);
filesToDelete.Add(newfile);
concatFiles.Add(newfile);
tasks.Add(task);
}
}
await Task.WhenAll(tasks.ToArray());
if (string.IsNullOrWhiteSpace(step.ComplexFilter))
{
await ConcatFilesSimple(step, progress, concatFiles, outputFormat, cancellation);
}
else
{
await ConcatFilesComplex(step, progress, concatFiles, cancellation);
}
}
finally
{
foreach (var file in filesToDelete)
{
File.Delete(file);
}
}
}
