internal static async Task ConvertAsync(GifModel.Config config, IProgress progress)
{
Debug.Assert(IsAvailable());
var p = new Process
{
StartInfo =
{
UseShellExecute = false,
WindowStyle = ProcessWindowStyle.Hidden,
CreateNoWindow = true,
RedirectStandardError = true,
FileName = Path,
Arguments = $"-framerate {config.FramesPerSecond} -i \"{config.TmpFilename}%4d.png\" -c:v libx264 -preset veryslow -crf 1 -pix_fmt yuv420p -frames:v {config.FramesPerSecond * config.NumSeconds} -r {config.FramesPerSecond} \"{config.Filename}\""
}
};
var numFrames = config.NumSeconds * config.FramesPerSecond;
progress.What = "converting";
// progress reports
p.ErrorDataReceived += (sender, args) =>
{
if (args.Data == null)
{
return;
}
if (args.Data.StartsWith("frame="))
{
if (int.TryParse(args.Data.Substring("frame=".Length), out var frame))
{
progress.Progress = frame / (float)numFrames;
}
}
};
if (!p.Start())
{
throw new Exception("could not start ffmpeg.exe");
}
p.BeginErrorReadLine();
while (!p.HasExited)
{
await Task.Run(() => p.WaitForExit(100));
if (progress.Token.IsCancellationRequested && !p.HasExited)
{
p.Kill();
progress.Token.ThrowIfCancellationRequested();
}
}
}
public override async void Execute()
{
if (models.NumEnabled != 2)
{
models.Window.ShowErrorDialog("Exactly two image equations should be visible for exporting");
return;
}
if (models.Images.ImageType != typeof(TextureArray2D))
{
models.Window.ShowErrorDialog("Only 2D textures are supported");
return;
}
if (!FFMpeg.IsAvailable())
{
if (models.Window.ShowYesNoDialog("ffmpeg is required for this feature. " +
"Please download the ffmpeg binaries and place them in the ImageViewer root directory. " +
"Open ffmpeg download page and ImageViewer root?", "download ffmpeg?"))
{
var root = Path.GetDirectoryName(System.Reflection.Assembly.GetExecutingAssembly().Location);
if (root != null)
{
System.Diagnostics.Process.Start(root);
}
System.Diagnostics.Process.Start("https://www.ffmpeg.org/download.html");
}
return;
}
var ids = models.GetEnabledPipelines();
// images valid?
var img1 = models.Pipelines[ids[0]].Image;
var img2 = models.Pipelines[ids[1]].Image;
if (img1 == null)
{
return;
}
if (img2 == null)
{
return;
}
// ReSharper disable once CompareOfFloatsByEqualityOperator
if (models.Display.Multiplier != 1.0f)
{
models.Window.ShowInfoDialog("Export will ignore image multiplier");
}
path.InitFromEquations(models);
var sfd = new SaveFileDialog
{
Filter = "MPEG-4 (*.mp4)|*.mp4",
InitialDirectory = path.Directory,
FileName = path.Filename
};
if (sfd.ShowDialog(models.Window.TopmostWindow) != true)
{
return;
}
path.UpdateFromFilename(sfd.FileName, updateExtension: false);
viewModel.InitTitles(models);
var dia = new GifExportDialog(viewModel);
if (models.Window.ShowDialog(dia) != true)
{
return;
}
// get tmp directory
var tmpDir = Path.Combine(Path.GetTempPath(), Path.GetFileNameWithoutExtension(Path.GetTempFileName()));
System.IO.Directory.CreateDirectory(tmpDir);
var tmpName = tmpDir + "\\frame";
// delete old file if it existed (otherwise ffmpeg will hang)
System.IO.File.Delete(sfd.FileName);
GifModel.Config config = new GifModel.Config
{
Filename = sfd.FileName,
TmpFilename = tmpName,
FramesPerSecond = viewModel.FramesPerSecond,
SliderWidth = viewModel.SliderSize,
NumSeconds = viewModel.TotalSeconds,
Label1 = viewModel.Title1,
Label2 = viewModel.Title2,
Left = (TextureArray2D)img1,
Right = (TextureArray2D)img2,
Overlay = (TextureArray2D)models.Overlay.Overlay
};
models.Gif.CreateGif(config, models.SharedModel);
await models.Progress.WaitForTaskAsync();
// delete tmp directory
try
{
System.IO.Directory.Delete(tmpDir, true);
}
catch (Exception)
{
// ignored
}
if (models.Progress.LastTaskCancelledByUser)
{
return;
}
if (!String.IsNullOrEmpty(models.Progress.LastError))
{
models.Window.ShowErrorDialog(models.Progress.LastError);
}
else if (askForVideo)
{
askForVideo = models.Window.ShowYesNoDialog("Open video?", "Finished exporting");
if (askForVideo)
{
System.Diagnostics.Process.Start(config.Filename);
}
}
}
internal static async Task ConvertAsync(GifModel.Config config, IProgress progress)
{
Debug.Assert(IsAvailable());
string startArgs =
$"-framerate {config.FramesPerSecond} -i \"{config.TmpFilename}%4d.png\" -c:v libx264 -preset veryslow -crf 12 -pix_fmt yuv420p -frames:v {config.FramesPerSecond * config.NumSeconds} -r {config.FramesPerSecond} \"{config.Filename}\"";
var p = new Process
{
StartInfo =
{
UseShellExecute = false,
WindowStyle = ProcessWindowStyle.Hidden,
CreateNoWindow = true,
RedirectStandardError = true,
FileName = Path,
Arguments = startArgs
}
};
var numFrames = config.NumSeconds * config.FramesPerSecond;
progress.What = "converting";
// progress reports
string errors = "";
p.ErrorDataReceived += (sender, args) =>
{
if (args.Data == null)
{
return;
}
Console.Error.WriteLine("FFMPEG: " + args.Data);
if (args.Data.StartsWith("frame="))
{
var substr = args.Data.Substring("frame=".Length);
substr = substr.TrimStart().Split(' ')[0];
if (int.TryParse(substr, out var frame))
{
progress.Progress = frame / (float)numFrames;
}
}
else if (args.Data.StartsWith("error", StringComparison.OrdinalIgnoreCase))
{
errors += args.Data;
errors += "\n";
}
};
if (!p.Start())
{
throw new Exception("could not start ffmpeg.exe");
}
p.BeginErrorReadLine();
while (!p.HasExited)
{
await Task.Run(() => p.WaitForExit(100));
if (progress.Token.IsCancellationRequested && !p.HasExited)
{
p.Kill();
progress.Token.ThrowIfCancellationRequested();
}
}
if (!String.IsNullOrEmpty(errors))
{
throw new Exception(errors);
}
}
