private static String ConstructTrackOrder(VideoFileInfo videoFile)
{
List<Int32>trackNumbers = new List<Int32>(videoFile.Tracks.Count);
videoFile.Tracks.Where(t => t.TrackType == TrackType.Video)
.OrderBy(t => t.MkvToolsTrackNumber)
.ToList().ForEach(t => trackNumbers.Add(t.MkvToolsTrackNumber));
videoFile.Tracks.Where(t => t.TrackType == TrackType.Audio && t.Default == true)
.OrderBy(t => t.MkvToolsTrackNumber)
.ToList().ForEach(t => trackNumbers.Add(t.MkvToolsTrackNumber));
videoFile.Tracks.Where(t => t.TrackType == TrackType.Audio && t.Default == false)
.OrderBy(t => t.MkvToolsTrackNumber)
.ToList().ForEach(t => trackNumbers.Add(t.MkvToolsTrackNumber));
videoFile.Tracks.Where(t => t.TrackType == TrackType.Subtitle && t.Default == true)
.OrderBy(t => t.MkvToolsTrackNumber)
.ToList().ForEach(t => trackNumbers.Add(t.MkvToolsTrackNumber));
videoFile.Tracks.Where(t => t.TrackType == TrackType.Subtitle && t.Default == false)
.OrderBy(t => t.MkvToolsTrackNumber)
.ToList().ForEach(t => trackNumbers.Add(t.MkvToolsTrackNumber));
videoFile.Tracks.Where(t => t.TrackType == TrackType.Other)
.OrderBy(t => t.MkvToolsTrackNumber)
.ToList().ForEach(t => trackNumbers.Add(t.MkvToolsTrackNumber));
StringBuilder mkvMergeTrackOrder = new StringBuilder();
trackNumbers.ForEach(n => mkvMergeTrackOrder.AppendFormat("0:{0},", n));
mkvMergeTrackOrder.Remove(mkvMergeTrackOrder.Length - 1, 1);
return mkvMergeTrackOrder.ToString();
}
private static void ConvertFlacToAac(VideoFileInfo mkvFile)
{
foreach (TrackInfo track in mkvFile.Tracks)
{
if (track.Codec == flacCodecID)
{
Console.WriteLine("Transcoding FLAC streams {0}(id:{1}) from {2}",
track.Name, track.TrackNumber, mkvFile.VideoFile.FullName);
FileInfo aacFile = new FileInfo(tempFolder.FullName + Path.DirectorySeparatorChar +
mkvFile.VideoFile.Name + '.' + track.MkvToolsTrackNumber + ".mp4");
String ffmpegParameters =
String.Format(ffMpegBaseParameters, mkvFile.VideoFile.FullName, track.MkvToolsTrackNumber);
String neroAacParameters = String.Format(neroAacEncBaseParameters, aacFile.FullName);
String fullCommand = pathToFFMpeg + " " + ffmpegParameters +
" | " + pathToNeroAacEnc + " " + neroAacParameters;
//We pipe the stream from ffmpeg directly into the neroAAC encoder.
Console.WriteLine("ffmpeg to neroAAC Command:");
Console.WriteLine(fullCommand);
Process transcodeProcess = StartExternalProcess("cmd", "/C " + fullCommand);
Console.WriteLine(transcodeProcess.StandardError.ReadToEnd());
transcodeProcess.WaitForExit(encodeTimeout * 1000);
if (transcodeProcess.HasExited)
{
if (transcodeProcess.ExitCode != 0 || !aacFile.Exists)
{
Console.WriteLine("Error with transcoding");
}
else
{
track.ExternalFileRef = aacFile;
}
}
else
{
Console.WriteLine("MKV transcode application took longer than {0} seconds.", encodeTimeout);
transcodeProcess.Kill();
}
}
}
}
public static VideoFileInfo ParseMKVInfo(String mkvInfoFile)
{
FileInfo infoFile = new FileInfo(mkvInfoFile);
VideoFileInfo videoInfo = new VideoFileInfo();
using (TextReader reader = infoFile.OpenText())
{
String line = reader.ReadLine();
while (line != trackStart && !String.IsNullOrEmpty(line))
{
if (line.StartsWith(segmentUid))
videoInfo.SegmentUID = line.Substring(segmentUid.Length);
line = reader.ReadLine();
}
if (line != trackStart)
throw new Exception("Invalid info file format or MKV without tracks");
videoInfo.Tracks = ExtractTrackInfo(reader);
}
return videoInfo;
}
private static void TranscodeFlac(VideoFileInfo mkvFile, DirectoryInfo targetFolder)
{
ConvertFlacToAac(mkvFile);
RemuxFile(mkvFile, targetFolder);
}
private static void RemuxFile(VideoFileInfo mkvFile, DirectoryInfo targetFolder)
{
FileInfo target = new FileInfo(targetFolder.FullName + Path.DirectorySeparatorChar + mkvFile.VideoFile.Name);
Console.WriteLine("Remuxing {0} to {1}", mkvFile.VideoFile.FullName, target.FullName);
String mkvMergeParams = PrepareMkvMergeParameters(mkvFile, target);
Console.WriteLine("MkvMerge Command:");
Console.WriteLine(pathToMkvMerge + " " + mkvMergeParams);
Process mkvMergeProcess = StartExternalProcess(pathToMkvMerge, mkvMergeParams);
Console.WriteLine(mkvMergeProcess.StandardError.ReadToEnd());
mkvMergeProcess.WaitForExit(mergeTimeout * 1000);
if (mkvMergeProcess.HasExited)
{
target.Refresh();
if (mkvMergeProcess.ExitCode != 0 || !target.Exists)
{
Console.WriteLine("Error with mkvMerge");
}
else
{
foreach (TrackInfo track in mkvFile.Tracks)
{
if (track.ExternalFileRef != null && track.ExternalFileRef.Exists)
track.ExternalFileRef.Delete();
}
}
}
else
{
Console.WriteLine("MKV merge application took longer than {0} seconds.", mergeTimeout);
mkvMergeProcess.Kill();
}
}
private static String PrepareMkvMergeParameters(VideoFileInfo mkvFile, FileInfo target)
{
StringBuilder mkvMergeParams = new StringBuilder();
mkvMergeParams.AppendFormat("-o \"{0}\"", target.FullName);
if (!String.IsNullOrWhiteSpace(mkvFile.SegmentUID))
mkvMergeParams.AppendFormat(" --segment-uid \"{0}\"", mkvFile.SegmentUID); //we keep the same segmentUID as source to preserve external chapter support. (OP/ED's etc)
List<String> audioIdsToSkip = new List<String>();
foreach (TrackInfo track in mkvFile.Tracks)
{
if (track.TrackType == TrackType.Video)
{
mkvMergeParams.AppendFormat(" --compression {0}:none", track.MkvToolsTrackNumber);
}
if (track.TrackType == TrackType.Audio && track.Codec == flacCodecID)
{
audioIdsToSkip.Add(track.MkvToolsTrackNumber.ToString());
}
}
mkvMergeParams.AppendFormat(" --audio-tracks !{0}", String.Join(",", audioIdsToSkip));
mkvMergeParams.AppendFormat(" \"{0}\"", mkvFile.VideoFile.FullName);
foreach (TrackInfo track in mkvFile.Tracks)
{
if (track.TrackType == TrackType.Audio && track.Codec == flacCodecID)
{
String reworkedTrackName = ReplaceFlacIndicator(track.Name);
if(!String.IsNullOrWhiteSpace(reworkedTrackName))
mkvMergeParams.AppendFormat(" --track-name \"0:{0}\"", reworkedTrackName);
if (String.IsNullOrWhiteSpace(track.Language)) //eng is the default track language, this is sometimes ommited in the source files resulting in an empty language code.
mkvMergeParams.AppendFormat(" --language 0:eng");
else
mkvMergeParams.AppendFormat(" --language 0:{0}", track.Language); ;
mkvMergeParams.AppendFormat(" --compression 0:none");
if (!track.Default) //yes is the default value of this flag, there is no need to specify this case.
mkvMergeParams.Append(" --default-track 0:no");
if(track.Forced)
mkvMergeParams.Append(" --forced-track 0:yes");
//Ensure we only grab audio from this file
mkvMergeParams.Append(" --no-video --no-subtitles --no-buttons --no-track-tags");
mkvMergeParams.Append(" --no-chapters --no-attachments --no-global-tags");
mkvMergeParams.AppendFormat(" --audio-tracks 0 \"{0}\"", track.ExternalFileRef.FullName);
}
}
List<String> trackOrder = new List<String>();
Int32 externalFileCounter = 0;
foreach (TrackInfo track in mkvFile.Tracks)
{
if (track.TrackType == TrackType.Audio && track.Codec == flacCodecID)
{
externalFileCounter += 1;
trackOrder.Add(String.Format("{0}:0", externalFileCounter));
}
else
{
trackOrder.Add(String.Format("0:{0}", track.MkvToolsTrackNumber));
}
}
mkvMergeParams.AppendFormat(" --track-order {0}", String.Join(",", trackOrder));
return mkvMergeParams.ToString();
}