public async Task CreatePresentation(List <PresentationItem> presentationItems,
string directory,
string outputFileName,
string audioPath = null,
bool useMultiThread = false)
{
if (!Directory.Exists(directory))
{
Directory.CreateDirectory(directory);
}
Directory.SetCurrentDirectory(directory);
var tempOutput = $"temp_{outputFileName}";
var threadCount = useMultiThread ? Environment.ProcessorCount.ToString() : "1";
await using var streamWriter = new StreamWriter("videoList.txt");
var parallelLoopResult = Parallel.ForEach(presentationItems, (presentationItem, state, index) =>
{
var videoPath = $"{index}.mp4";
var presentationItemOut = 1.0 / (presentationItem.Out - presentationItem.In);
var duration = TimeSpan.FromSeconds(presentationItem.Out - presentationItem.In).ToString(@"hh\:mm\:ss");
try
{
var conversionResult = FFmpeg.Conversions.New()
.AddParameter($"-threads {threadCount}")
.AddParameter($"-framerate {presentationItemOut:0.00000}")
.AddParameter($"-i {presentationItem.LocalSource}")
.AddParameter("-vcodec libx264")
.AddParameter("-crf 27")
.AddParameter("-preset veryfast")
.AddParameter("-vf fps=5")
.AddParameter("-pix_fmt yuv420p")
.AddParameter("-ss 00:00:00")
.AddParameter($"-t {duration}")
.AddParameter(videoPath)
.SetOverwriteOutput(true)
.Start().GetAwaiter().GetResult();
}
catch (Exception e)
{
throw;
}
File.Delete(presentationItem.LocalSource);
});
for (var i = 0; i < presentationItems.Count; i++)
{
var videoPath = $"{i}.mp4";
await streamWriter.WriteLineAsync($"file '{videoPath}'");
}
streamWriter.Close();
await FFmpeg.Conversions.New()
.AddParameter("-f concat")
.AddParameter("-safe 0")
.AddParameter("-i videoList.txt -c copy")
.AddParameter(tempOutput)
.Start();
if (!string.IsNullOrEmpty(audioPath))
{
await _videoService.AddAudio(tempOutput, audioPath, outputFileName);
File.Delete(tempOutput);
return;
}
for (int i = 0; i < presentationItems.Count; i++)
{
if (File.Exists($"{i}.mp4"))
{
File.Delete($"{i}.mp4");
}
if (File.Exists($"{i}.png"))
{
File.Delete($"{i}.png");
}
}
File.Delete("videoList.txt");
var parentDirectory = Directory.GetParent(Directory.GetCurrentDirectory()).FullName;
var newFileDestination = Path.Combine(parentDirectory, outputFileName);
File.Move(tempOutput, newFileDestination, true);
Thread.Sleep(4000);
Directory.SetCurrentDirectory(Directory.GetParent(Directory.GetCurrentDirectory()).FullName);
Directory.Delete(directory);
}