/// <summary>
/// Converts the input file into an MPEG DASH representation with multiple bitrates.
/// </summary>
/// <param name="inFile">The video file to convert.</param>
/// <param name="outFilename">The base filename to use for the output files. Files will be overwritten if they exist.</param>
/// <param name="framerate">Output video stream framerate. Pass zero to make this automatic based on the input file.</param>
/// <param name="keyframeInterval">Output video keyframe interval. Pass zero to make this automatically 3x the framerate.</param>
/// <param name="qualities">Parameters to pass to ffmpeg when performing the preparation encoding. Bitrates must be distinct, an exception will be thrown if they are not.</param>
/// <param name="options">Options for the ffmpeg encode.</param>
/// <param name="outDirectory">The directory to place output files and intermediary files in.</param>
/// <param name="progress">A callback for progress events. The collection will contain values with the Name property of "Encode", "DASHify", "Post Process"</param>
/// <param name="cancel">Allows cancellation of the operation.</param>
/// <returns>An object containing a representation of the generated MPD file, it's path, and the associated filenames, or null if no file generated.</returns>
public DashEncodeResult GenerateDash(string inFile, string outFilename, int framerate, int keyframeInterval,
IEnumerable <IQuality> qualities, IEncodeOptions options = null, string outDirectory = null, IProgress <IEnumerable <EncodeStageProgress> > progress = null, CancellationToken cancel = default(CancellationToken))
{
cancel.ThrowIfCancellationRequested();
options = options ?? new H264EncodeOptions();
outDirectory = outDirectory ?? WorkingDirectory;
// Input validation.
if (inFile == null || !File.Exists(inFile))
{
throw new FileNotFoundException("Input path does not exist.");
}
if (!Directory.Exists(outDirectory))
{
throw new DirectoryNotFoundException("Output directory does not exist.");
}
if (string.IsNullOrEmpty(outFilename))
{
throw new ArgumentNullException("Output filename is null or empty.");
}
if (qualities == null || qualities.Count() == 0)
{
throw new ArgumentOutOfRangeException("No qualitied specified. At least one quality is required.");
}
// Check for invalid characters and remove them.
outFilename = RemoveSymbols(outFilename, '#', '&', '*', '<', '>', '/', '?', ':', '"');
// Another check to ensure we didn't remove all the characters.
if (outFilename.Length == 0)
{
throw new ArgumentNullException("Output filename is null or empty.");
}
// Check bitrate distinction.
if (qualities.GroupBy(x => x.Bitrate).Count() != qualities.Count())
{
throw new ArgumentOutOfRangeException("Duplicate bitrates found. Bitrates must be distinct.");
}
var inputStats = ProbeFile(inFile);
if (inputStats == null)
{
throw new NullReferenceException("ffprobe query returned a null result.");
}
int inputBitrate = (int)(inputStats.Bitrate / 1024);
if (!DisableQualityCrushing)
{
qualities = QualityCrusher.CrushQualities(qualities, inputBitrate);
}
var compareQuality = qualities.First();
bool enableStreamCopy = EnableStreamCopying && compareQuality.Bitrate == 0 &&
Copyable264Infer.DetermineCopyCanBeDone(compareQuality.PixelFormat, compareQuality.Level, compareQuality.Profile, inputStats.VideoStreams);
var progressList = new List <EncodeStageProgress>()
{
new EncodeStageProgress("Encode", 0),
new EncodeStageProgress("DASHify", 0),
new EncodeStageProgress("Post Process", 0)
};
const int encodeStage = 0;
const int dashStage = 1;
const int postStage = 2;
var stdErrShim = stderrLog;
if (progress != null)
{
stdErrShim = new Action <string>(x =>
{
stderrLog(x);
if (x != null)
{
var match = Encode.Regexes.ParseProgress.Match(x);
if (match.Success && TimeSpan.TryParse(match.Value, out TimeSpan p))
{
ReportProgress(progress, progressList, encodeStage, Math.Min(1, (float)(p.TotalMilliseconds / 1000) / inputStats.Duration));
}
}
});
}
framerate = framerate <= 0 ? (int)Math.Round(inputStats.Framerate) : framerate;
keyframeInterval = keyframeInterval <= 0 ? framerate * 3 : keyframeInterval;
// Build task definitions.
var ffmpegCommand = CommandBuilder.BuildFfmpegCommand(
inPath: inFile,
outDirectory: WorkingDirectory,
outFilename: outFilename,
options: options,
framerate: framerate,
keyframeInterval: keyframeInterval,
qualities: qualities.OrderByDescending(x => x.Bitrate),
metadata: inputStats,
defaultBitrate: inputBitrate,
enableStreamCopying: enableStreamCopy);
cancel.ThrowIfCancellationRequested();
// Generate intermediates
try
{
ExecutionResult ffResult;
stderrLog.Invoke($"Running ffmpeg with arguments: {ffmpegCommand.RenderedCommand}");
ffResult = ManagedExecution.Start(FFmpegPath, ffmpegCommand.RenderedCommand, stdoutLog, stdErrShim, cancel);
// Detect error in ffmpeg process and cleanup, then return null.
if (ffResult.ExitCode != 0)
{
stderrLog.Invoke($"ERROR: ffmpeg returned code {ffResult.ExitCode}. File: {inFile}");
CleanOutputFiles(ffmpegCommand.CommandPieces.Select(x => x.Path));
return(null);
}
}
catch (Exception ex)
{
CleanOutputFiles(ffmpegCommand.CommandPieces.Select(x => x.Path));
if (ex is OperationCanceledException)
{
throw new OperationCanceledException($"Exception running ffmpeg on {inFile}", ex);
}
else
{
throw new Exception($"Exception running ffmpeg on {inFile}", ex);
}
}
var audioVideoFiles = ffmpegCommand.CommandPieces.Where(x => x.Type == StreamType.Video || x.Type == StreamType.Audio);
var mp4boxCommand = CommandBuilder.BuildMp4boxMpdCommand(
inFiles: audioVideoFiles.Select(x => x.Path),
outFilePath: Path.Combine(outDirectory, outFilename) + ".mpd",
keyInterval: (keyframeInterval / framerate) * 1000);
// Generate DASH files.
ExecutionResult mpdResult;
stderrLog.Invoke($"Running MP4Box with arguments: {mp4boxCommand.RenderedCommand}");
try
{
mpdResult = ManagedExecution.Start(BoxPath, mp4boxCommand.RenderedCommand, stdoutLog, stderrLog, cancel);
}
catch (Exception ex)
{
CleanOutputFiles(audioVideoFiles.Select(x => x.Path));
if (ex is OperationCanceledException)
{
throw new OperationCanceledException($"Exception running MP4box on {inFile}", ex);
}
else
{
throw new Exception($"Exception running MP4box on {inFile}", ex);
}
}
// Report DASH complete.
if (mpdResult.ExitCode == 0)
{
ReportProgress(progress, progressList, dashStage, 1);
}
// Cleanup intermediates.
CleanOutputFiles(audioVideoFiles.Select(x => x.Path));
ReportProgress(progress, progressList, postStage, 0.33);
// Move subtitles found in media
List <StreamFile> subtitles = new List <StreamFile>();
foreach (var subFile in ffmpegCommand.CommandPieces.Where(x => x.Type == StreamType.Subtitle))
{
string oldPath = subFile.Path;
subFile.Path = Path.Combine(outDirectory, Path.GetFileName(subFile.Path));
subtitles.Add(subFile);
if (oldPath != subFile.Path)
{
if (File.Exists(subFile.Path))
{
File.Delete(subFile.Path);
}
File.Move(oldPath, subFile.Path);
}
}
// Add external subtitles
int originIndex = ffmpegCommand.CommandPieces.Max(x => x.Origin) + 1;
string baseFilename = Path.GetFileNameWithoutExtension(inFile);
foreach (var vttFile in Directory.EnumerateFiles(Path.GetDirectoryName(inFile), baseFilename + "*", SearchOption.TopDirectoryOnly))
{
if (vttFile.EndsWith(".vtt"))
{
string vttFilename = Path.GetFileName(vttFile);
string vttName = GetSubtitleName(vttFilename);
string vttOutputPath = Path.Combine(outDirectory, $"{outFilename}_subtitle_{vttName}_{originIndex}.vtt");
var subFile = new StreamFile()
{
Type = StreamType.Subtitle,
Origin = originIndex,
Path = vttOutputPath,
Name = $"{vttName}_{originIndex}"
};
originIndex++;
File.Copy(vttFile, vttOutputPath, true);
subtitles.Add(subFile);
}
}
ReportProgress(progress, progressList, postStage, 0.66);
try
{
string mpdFilepath = mp4boxCommand.CommandPieces.FirstOrDefault().Path;
if (File.Exists(mpdFilepath))
{
MPD mpd = PostProcessMpdFile(mpdFilepath, subtitles);
var result = new DashEncodeResult(mpd, inputStats.Metadata, TimeSpan.FromMilliseconds((inputStats.VideoStreams.FirstOrDefault()?.duration ?? 0) * 1000), mpdFilepath);
// Detect error in MP4Box process and cleanup, then return null.
if (mpdResult.ExitCode != 0)
{
stderrLog.Invoke($"ERROR: MP4Box returned code {mpdResult.ExitCode}. File: {inFile}");
CleanOutputFiles(result.MediaFiles.Select(x => Path.Combine(outDirectory, x)));
CleanOutputFiles(mpdResult.Output);
return(null);
}
// Success.
return(result);
}
stderrLog.Invoke($"ERROR: MP4Box did not produce the expected mpd file at path {mpdFilepath}. File: {inFile}");
return(null);
}
finally
{
ReportProgress(progress, progressList, postStage, 1);
}
}
/// <summary>
/// oOnverts the input file into an MPEG DASH representations.
/// This includes multiple bitrates, subtitle tracks, audio tracks, and an MPD manifest.
/// </summary>
/// <param name="config"></param>
/// <param name="progress"></param>
/// <param name="cancel"></param>
/// <returns></returns>
public DashEncodeResult GenerateDash(DashConfig config, IProgress <Dictionary <EncodingStage, double> > progress = null, CancellationToken cancel = default(CancellationToken))
{
cancel.ThrowIfCancellationRequested();
if (!Directory.Exists(WorkingDirectory))
{
throw new DirectoryNotFoundException("The given path for the working directory doesn't exist.");
}
//Field declarations
MediaMetadata inputStats;
IQuality compareQuality;
int inputBitrate;
bool enableStreamCopy = false;
inputStats = ProbeFile(config.InputFilePath);
if (inputStats == null)
{
throw new NullReferenceException("ffprobe query returned a null result.");
}
inputBitrate = (int)(inputStats.Bitrate / 1024);
if (!DisableQualityCrushing)
{
config.Qualities = QualityCrusher.CrushQualities(config.Qualities, inputBitrate);
}
compareQuality = config.Qualities.First();
if (EnableStreamCopying && compareQuality.Bitrate == 0)
{
enableStreamCopy = Copyable264Infer.DetermineCopyCanBeDone(compareQuality.PixelFormat, compareQuality.Level, compareQuality.Profile.ToString(), inputStats.VideoStreams);
}
// Set the framerate interval to match input if user has not already set
if (config.Framerate <= 0)
{
config.Framerate = (int)Math.Round(inputStats.Framerate);
}
// Set the keyframe interval to match input if user has not already set
if (config.KeyframeInterval <= 0)
{
config.KeyframeInterval = config.Framerate * 3;
}
//This is not really the proper place to have this
// Logging shim for ffmpeg to get progress info
var ffmpegLogShim = new Action <string>(x =>
{
if (x != null)
{
var match = Encode.Regexes.ParseProgress.Match(x);
if (match.Success && TimeSpan.TryParse(match.Value, out TimeSpan p))
{
stdoutLog(x);
float progressFloat = Math.Min(1, (float)(p.TotalMilliseconds / 1000) / inputStats.Duration);
if (progress != null)
{
ReportProgress(progress, EncodingStage.Encode, progressFloat);
}
}
else
{
stderrLog(x);
}
}
else
{
stderrLog(x);
}
});
cancel.ThrowIfCancellationRequested();
FfmpegRenderedCommand ffmpgCommand = EncodeVideo(config, inputStats, inputBitrate, enableStreamCopy, ffmpegLogShim, cancel);
if (ffmpgCommand is null)
{
return(null);
}
Mp4BoxRenderedCommand mp4BoxCommand = GenerateDashManifest(config, ffmpgCommand.VideoPieces, ffmpgCommand.AudioPieces, cancel);
if (mp4BoxCommand is null)
{
return(null);
}
ReportProgress(progress, EncodingStage.DASHify, 1);
ReportProgress(progress, EncodingStage.PostProcess, 0.3);
int maxFileIndex = ffmpgCommand.AllPieces.Max(x => x.Index);
List <StreamSubtitleFile> allSubtitles = ProcessSubtitles(config, ffmpgCommand.SubtitlePieces, maxFileIndex + 1);
ReportProgress(progress, EncodingStage.PostProcess, 0.66);
try
{
string mpdFilepath = mp4BoxCommand.MpdPath;
if (File.Exists(mpdFilepath))
{
MPD mpd = PostProcessMpdFile(mpdFilepath, allSubtitles);
var result = new DashEncodeResult(mpd, inputStats.Metadata, TimeSpan.FromMilliseconds((inputStats.VideoStreams.FirstOrDefault()?.duration ?? 0) * 1000), mpdFilepath);
// Success.
return(result);
}
stderrLog.Invoke($"ERROR: MP4Box did not produce the expected mpd file at path {mpdFilepath}. File: {config.InputFilePath}");
return(null);
}
finally
{
ReportProgress(progress, EncodingStage.PostProcess, 1);
}
}