/// <summary>
/// Generate single encoded video stream based on JOB and OUTPUT DEFINITION
/// </summary>
/// <param name="v">Defines the video stream being generated</param>
/// <param name="j">The overall job for this encode run</param>
/// <param name="xEncoder">libx264 or libx265</param>
public void EncodeX(VideoOutputDefinition v, VideoEncodeJob j, string xEncoder)
{
MediaProperties ma = j.InputMedia[0];
MediaStream vs = ma.Streams[ma.FirstVideoIndex];
//implicitly set frame rate.
//To do: this needs to be rationals, not floats
var rateString = vs.VideoFrameRate > 0 ? $"-r {((j.MatchRate != 0) ? j.MatchRate : vs.VideoFrameRate)}" : String.Empty;
//Select proper prefix based on input media.
//MPEG files require a specific syntax on the input to prevent time-code issues.
var FFRoot = this.MpegFiles.Contains(Path.GetExtension(ma.MediaFile).ToLower()) ? this.FFRootCmdMpg : this.FFRootCmdDefault;
FilterChain f = this.ConfigureFilters(v, j);
for (int pass = 1; pass <= v.NumPasses; pass++)
{
var FFCmd = $"{FFRoot} -i {j.InputMedia[0].MediaFile} {f.GetVideoFilters()} " +
$"-pix_fmt {this.PixelFormatMap[j.PixelFmt]} " +
$"-preset {this.EncoderPresetMap[j.Preset]} " +
$"-an -c:v lib{xEncoder} " +
$"-metadata:s:v:0 language={j.Language} " +
//ToDo: this needs to be a rational like "24000/1001" to prevent rate drift during sitching or concetnation.
$"{rateString} " +
$"{this.BuildX26xEncOptions(v, j, pass, xEncoder)} " +
$"{Path.Combine(j.OutputFolder, v.OutputFileName)}";
//Run
this.utils.LogProxy($"\r\nSTARTING {xEncoder} Encode pass {pass} of {v.NumPasses}", Utilities.LogLevel.Info);
this.ExecuteFFMpeg_LogProgress(FFCmd, ma.MediaDuration);
}
}
private string RunScan(MediaProperties ma, FilterChain fc, int startSeconds = 0, int scanDuration = 0)
{
var videoStream = ma.Streams.FirstOrDefault(m => m.StreamType == StreamType.Video);
if (scanDuration == 0)
{
scanDuration = Convert.ToInt32(ma.MediaDuration);
}
var scanCmd =
$" -ss {startSeconds} -y -i {ma.MediaFile} -pix_fmt yuv420p -t {scanDuration} {fc.GetVideoFilters()} -an -f null NUL";
return(this.ExecuteFFMpeg_LogProgress(scanCmd, scanDuration).StdErr);
}
/// <summary>
/// Parse the scan results to detect combed video or film content...
/// </summary>
/// <param name="ma"> MediaAttributes.</param>
/// <param name="scanData">Results of FFMPEG run</param>
private void ParseCombScanData(MediaProperties ma, string scanData)
{
string[] sfd = null;
string[] mfd = null;
string[] rfd = null;
var fieldMatchFailures = 0;
string[] scanDataLines = scanData.Split(new[]
{
"\n",
"\r\n"
}, StringSplitOptions.RemoveEmptyEntries);
//Extract field and frame info
foreach (string s in scanDataLines)
{
if (s.Contains("Repeated Fields"))
{
//remove dupe spaces
string t = Regex.Replace(s, @"\s+", " ").Replace(@": ", @":");
rfd = t.Split(' ');
}
if (s.Contains("Single frame detection"))
{
//remove dupe spaces
string t = Regex.Replace(s, @"\s+", " ").Replace(@": ", @":");
sfd = t.Split(' ');
}
if (s.Contains("Multi frame detection"))
{
//remove dupe spaces
string t = Regex.Replace(s, @"\s+", " ").Replace(@": ", @":");
t = t.Replace(": ", ":");
mfd = t.Split(' ');
}
if (s.Contains("still interlaced"))
{
fieldMatchFailures++;
}
}
if (sfd != null && mfd != null)
{
this.DoFrameAndFieldAnalysis(ma, mfd, rfd, fieldMatchFailures);
}
}
/// <summary>
/// Scan media, looking for combing artifacts.
/// Used for guiding de-interlacing and inverse-telecine filter selection.
/// </summary>
/// <param name="ma"> MediaAttributes.</param>
/// <param name="startSeconds"></param>
/// <param name="scanDuration"></param>
public void DetectCombing(MediaProperties ma, int startSeconds = 0, int scanDuration = 0)
{
//Settings for detecting combing and telecine patterns.
var filterIdet = "idet";
var filterFieldMatch = "fieldmatch=order=auto:combmatch=full:cthresh=12";
var filterChain = new FilterChain();
filterChain.AddFilter(filterIdet);
filterChain.AddFilter(filterFieldMatch);
this.utils.LogProxy($"Starting combing/telecine detection...", Utilities.LogLevel.Info);
var scanData = this.RunScan(ma, filterChain, startSeconds, scanDuration);
this.ParseCombScanData(ma, scanData);
}
/// <summary>
/// Derives x264/x265 options from JOB and OUTPUT DEFINITION
/// This only supports the parameters that are common between x264 and x265 and relies in their shared syntax.
/// VideoOutputDefinition.EncoderOptionOverride.Add() is used for unique encoder specific overrides.
/// </summary>
/// <param name="v">Defines the video stream being generated</param>
/// <param name="j">The overall job for this encode run</param>
/// <param name="pass">pass number of multi pass encode</param>
/// <param name="xEncoder">encoder to use</param>
protected string BuildX26xEncOptions(VideoOutputDefinition v, VideoEncodeJob j, int pass, string xEncoder)
{
MediaProperties ma = j.InputMedia[0];
MediaStream vs = ma.Streams[ma.FirstVideoIndex];
var statsFile = $"{Path.GetFileNameWithoutExtension(v.OutputFileName)}_STATS";
//Scene detection breaks GOP alignment across streams. Disable by default.
//May be re-enabled at the stream level, for example for DONWLOAD encodes.
var sceneDetection = v.AllowSceneDetection ? "" : "scenecut=0:";
//If job does not have color space for output implicitly set, derive it from source media.
var ColorArgs = (j.ColorSpec == VideoEncodeJob.OutputColorSpec.Unknown) ? this.getX26xColorSpaceArgs(vs) : this.ColorSpaceMap[j.ColorSpec];
var args = $"-{xEncoder}-params \"" +
$"bitrate={v.TargetBitrate}:" +
$"vbv-maxrate={v.PeakBitrate}:" +
$"vbv-bufsize={v.VBVBufferSize}:" +
$"min-keyint={Convert.ToInt32(j.GopLengthSeconds * vs.VideoFrameRate)}:" +
$"keyint={Convert.ToInt32(j.GopLengthSeconds * vs.VideoFrameRate)}:" +
$"rc-lookahead={j.LookAheadFrames}:" +
"open-gop=0:" + //GOPS must always be closed
$"{sceneDetection}" +
$"pass={pass}:" +
$"stats=\"{statsFile}\":" +
$"{ColorArgs}";
//handle HDR settings.
//HDR is only supported when the output is HEVC
if (xEncoder == "x265" && j.HdrMasteringDisplayPrimaries != null)
{
args += $":{this.Getx26xHdrString(j)}";
}
foreach (string overrideOption in v.EncoderOptionOverride)
{
args += $":{overrideOption}";
}
args += "\"";
return(args);
}
/// <summary>
/// Adds input media to job
/// </summary>
/// <param name="m">MediaAttributes object describing a single input</param>
public void AddInputMedia(MediaProperties m)
{
//Only one source per video encode job is permitted...
if (this.InputMedia.Count == 1)
{
this.utils.LogProxy($"Video encoding jobs may have only one input...",
Utilities.LogLevel.AppError);
}
//If present, fetch HDR data from source and add it to job
//But only if it is not already set.
//IE: trust delivered side-car metadata over embedded metadata
if (m.HasHDR && this.HdrMasteringDisplayPrimaries == null)
{
this.HdrMasteringDisplayPrimaries = m.Streams[m.FirstVideoIndex].MasteringDisplayPrimaries;
this.HdrMasteringDisplayLuminance = m.Streams[m.FirstVideoIndex].MasteringDisplayLuminance;
this.HdrCea8613HdrData = m.Streams[m.FirstVideoIndex].Cea8613HdrData;
}
this.InputMedia.Add(m);
}
/// <summary>
/// Parse the scan results to detect combed video or film content...
/// </summary>
/// <param name="ma"> MediaAttributes.</param>
/// <param name="mfd">Multi-frame detection data from FFMPEG IDET filter run</param>
/// <param name="rfd">Repeat fields data from FFMPEG IDET filter run</param>
/// <param name="fieldMatchFailures">Field match failures from FIELDMATCH filter run</param>
private void DoFrameAndFieldAnalysis(MediaProperties ma, string[] mfd, string[] rfd, int fieldMatchFailures)
{
//Detection settings
//If Progressive frame count falls below this level, combing
//is assumed...
decimal progressiveFrameThreshold = 95;
decimal ProgFramePercentage = 0;
decimal RepeatFieldPercentage = 0;
decimal TfFtoBffRatio = 0;
decimal mfdTff = 1, mfdBff = 1, mfdProg = 1;
decimal rfdNone = 1, rfdTop = 1, rfdBottom = 1;
foreach (string s in mfd)
{
if (s.Contains("TFF"))
{
mfdTff = Convert.ToDecimal(s.Split(':')[2]);
}
if (s.Contains("BFF"))
{
mfdBff = Convert.ToDecimal(s.Split(':')[1]);
}
if (s.Contains("Progressive"))
{
mfdProg = Convert.ToDecimal(s.Split(':')[1]);
}
}
foreach (string s in rfd)
{
if (s.Contains("Neither"))
{
rfdNone = Convert.ToDecimal(s.Split(':')[2]);
}
if (s.Contains("Top"))
{
rfdTop = Convert.ToDecimal(s.Split(':')[1]);
}
if (s.Contains("Bottom"))
{
rfdBottom = Convert.ToDecimal(s.Split(':')[1]);
}
}
//total number of identified frames.
decimal processedFrames = rfdBottom + rfdNone + rfdTop;
this.utils.LogProxy($"Total Scanned Frames (from IDET): {processedFrames}", Utilities.LogLevel.Info);
this.utils.LogProxy($"Fieldmatch Failures: {fieldMatchFailures}", Utilities.LogLevel.Info);
//Ratio of frames with repeated fields to the total number of frames identified
RepeatFieldPercentage = ((rfdTop + rfdBottom) / processedFrames) * 100;
this.utils.LogProxy($"RepeatFieldPercentage : {RepeatFieldPercentage:N2}", Utilities.LogLevel.Info);
//Ratio of detected progressive frames to total frames identified
ProgFramePercentage = (mfdProg / processedFrames) * 100;
this.utils.LogProxy($"Progressive frame percentage : {ProgFramePercentage:N2}", Utilities.LogLevel.Info);
//Compute ratio of TFF vs BFF frames.
if (mfdTff == 0 || mfdBff == 0)
{
TfFtoBffRatio = 0;
}
else
{
TfFtoBffRatio = Math.Max(mfdTff, mfdBff) / Math.Min(mfdTff, mfdBff);
}
this.utils.LogProxy($"TFF:BFF ratio : {mfdTff}:{mfdBff}", Utilities.LogLevel.Info);
//Once the detected progressive frame count falls below a threshold assume interlaced
if (ProgFramePercentage < progressiveFrameThreshold)
{
ma.HasCombing = true;
this.utils.LogProxy($"Combing detected...", Utilities.LogLevel.Info);
}
//If content is combed (low progressive frame count) and there are
//repeated fields, video probably has some telecine content
if (ma.HasCombing && (RepeatFieldPercentage > Convert.ToDecimal(5)))
{
this.utils.LogProxy($"Telecine content detected...", Utilities.LogLevel.Info);
ma.HasTelecine = true;
}
//If fieldmatch failures are very low, indicating either clean progressive media
//OR a clean telecine AND the progressive frame percentage is very low THEN
//flag media a cleanly telecined.
if (fieldMatchFailures / (double)processedFrames < 0.01 && ProgFramePercentage < 1)
{
ma.IsPureFilm = true;
this.utils.LogProxy($"Clean Telecine content detected...", Utilities.LogLevel.Info);
}
ma.IsPureVideo = (ma.HasCombing && !ma.HasTelecine);
ma.IsMixedFilmVideo = (ma.HasCombing && ma.HasTelecine && !ma.IsPureFilm);
this.utils.LogProxy($"PureVideo:{ma.IsPureVideo}", Utilities.LogLevel.Info);
this.utils.LogProxy($"Mixed Film and Video:{ma.IsMixedFilmVideo}", Utilities.LogLevel.Info);
//If media is combed but the TFF:BFF ratio approaches 1:1 this could indicate
//a potentially bad delivery.
if (ma.HasCombing && (TfFtoBffRatio < Convert.ToDecimal(1.25) && TfFtoBffRatio > Convert.ToDecimal(0.75)))
{
ma.BadDelivery = true;
this.utils.LogProxy($"Ratio of TFF and BFF frames of {TfFtoBffRatio:F}:1 indicates possibly poor delivery.", Utilities.LogLevel.Warning);
}
}
/// <summary>
/// Manages filters used to process video.
/// Scaling
/// De-interlacing
/// Cropping
/// Matching to master (for stitching scenarios, IE: dub cards)
/// Burning in sub-titles.
/// </summary>
/// <param name="outputVideo">Defines the video stream being generated</param>
/// <param name="videoEncodeJob">The overall job for this encode run</param>
protected FilterChain ConfigureFilters(VideoOutputDefinition outputVideo, VideoEncodeJob videoEncodeJob)
{
//Video stream
MediaProperties videoProperties = videoEncodeJob.InputMedia[0];
MediaStream inputVideo = videoProperties.Streams[videoProperties.FirstVideoIndex];
FilterChain filters = new FilterChain();
//Derived from desired width, source aspect and cropping options.
var TargetOutputHeight = 0;
if (!String.IsNullOrEmpty(videoProperties.FFCropFilter) && videoEncodeJob.AutoCrop)
{
//must crop before any scaling happens...
filters.AddFilter(videoProperties.FFCropFilter);
if (inputVideo.VideoPixelAspect != 1)
{
inputVideo.SquareVideoWidth = Convert.ToInt32(videoProperties.cropValue.XExtent * inputVideo.VideoPixelAspect);
inputVideo.SquareVideoHeight = videoProperties.cropValue.YExtent;
}
else
{
inputVideo.SquareVideoWidth = videoProperties.cropValue.XExtent;
inputVideo.SquareVideoHeight = videoProperties.cropValue.YExtent;
}
}
else
{
if (inputVideo.VideoPixelAspect != 1)
{
inputVideo.SquareVideoWidth = Convert.ToInt32(inputVideo.VideoWidth * inputVideo.VideoPixelAspect);
}
}
//De-interlace filter behavior.
//Must happen before any scaling operations.
//Only invoke on HD and SD at non-film frame rates
if (videoProperties.HasCombing && inputVideo.SquareVideoWidth <= 1920 && inputVideo.VideoFrameRate > 24)
{
if (videoEncodeJob.DeintOverride != VideoEncodeJob.DeinterlaceOverride.None)
{
//The job manager may desire to override behavior.
//For example, in the event where the main feature is cleanly telecined film
//but the credits are combed video. HBO LatAm does this.
filters.AddFilter(this.DeinterlaceOverrideMap[videoEncodeJob.DeintOverride]);
}
else if (videoProperties.IsMixedFilmVideo)
{
//Typical: 30i animation with some telecine segments.
//Preserve original frame rate. Inverse telecine film.
//De-comb video. There will be judder in the film segments.
filters.AddFilter(FFBase.DeintFilter_VideoBias);
}
else if (videoProperties.IsPureFilm)
{
//Old telecined content. Rare.
filters.AddFilter(FFBase.DeintFilter_PureTelecine);
}
else if (videoProperties.IsPureVideo)
{
//Talk shows. Next day TV. Old sitcoms.
//This filter setting is slow, but yields good results.
filters.AddFilter(FFBase.DeintFilter_PureVideoSD);
}
}
if (videoEncodeJob.MatchWidth != 0 && videoEncodeJob.MatchHeight != 0)
{
//Job indicates matching to master source.
filters.AddFilter(this.GetScaleMatchFilter(inputVideo.VideoPixelAspect == 1, videoEncodeJob.MatchWidth, videoEncodeJob.MatchHeight));
TargetOutputHeight = outputVideo.Width * videoEncodeJob.MatchHeight / videoEncodeJob.MatchWidth;
TargetOutputHeight = (TargetOutputHeight % 2 == 0) ? TargetOutputHeight : ++TargetOutputHeight;
filters.AddFilter($"scale={outputVideo.Width}:{TargetOutputHeight}");
}
else if (outputVideo.Width != inputVideo.SquareVideoWidth || inputVideo.VideoPixelAspect != 1)
{
//Input is either non-square or does not match desired output
TargetOutputHeight = outputVideo.Width * inputVideo.SquareVideoHeight / inputVideo.SquareVideoWidth;
TargetOutputHeight = (TargetOutputHeight % 2 == 0) ? TargetOutputHeight : ++TargetOutputHeight;
filters.AddFilter($"scale={outputVideo.Width}:{TargetOutputHeight}");
}
//Set source pixel aspect
filters.AddFilter("setsar=1/1");
//Sub titles go last to ensure some degree of readability on low res streams
if (!String.IsNullOrEmpty(videoEncodeJob.BurnSubs))
{
//Need to escape characters so the ASS filter will be happy.
videoEncodeJob.BurnSubs = videoEncodeJob.BurnSubs.Replace(@"\", @"\\");
videoEncodeJob.BurnSubs = videoEncodeJob.BurnSubs.Replace(@":", @"\:");
filters.AddFilter($"ass='{videoEncodeJob.BurnSubs}'");
}
return(filters);
}
/// <summary>
/// Scan media, finding black bars and selecting the most common result.
/// Used for automated cropping
/// </summary>
/// <param name="ma"> MediaAttributes.</param>
/// <param name="startSeconds"></param>
/// <param name="scanDuration"></param>
public void DetectLetterbox(MediaProperties ma, int startSeconds = 0, int scanDuration = 0)
{
var filterCropdetect = "cropdetect=0.1:2:0";
var filterChain = new FilterChain();
var videoStream = ma.Streams.FirstOrDefault(m => m.StreamType == StreamType.Video);
filterChain.AddFilter(filterCropdetect);
this.utils.LogProxy($"Starting letterbox detection...", Utilities.LogLevel.Info);
var scanData = this.RunScan(ma, filterChain, startSeconds, scanDuration);
ma.cropValue = this.GetCommonCropValue(scanData);
int bottomCrop = videoStream.VideoHeight - ma.cropValue.YExtent - ma.cropValue.YOffset;
//If the bars at the top differ in size from those at the bottom
//then re-scan because this is generally the result of noise at the top
//of the video frame that breaks bar detection.
if (Math.Abs(bottomCrop - ma.cropValue.YOffset) > 16)
{
filterChain.DeleteAll();
//Different masking values are used for suspected PAL and NSTC content.
//The crop filter syntax is counter-intuitive. It describes the visible region of media
//IE: crop=width:height:x-offset:y-offset <- this is the size of the output. Not the mask.
if (videoStream.VideoHeight < 650 && videoStream.VideoHeight > 525)
{
filterChain.AddFilter($"crop={videoStream.VideoWidth.ToString()}:{videoStream.VideoHeight - 32}:0:{32}");
}
else if (videoStream.VideoHeight <= 525)
{
filterChain.AddFilter($"crop={videoStream.VideoWidth.ToString()}:{videoStream.VideoHeight - 16}:0:{16}");
}
filterChain.AddFilter(filterCropdetect);
this.utils.LogProxy($"Starting second letterbox detection scan due to detected noise...",
Utilities.LogLevel.Info);
scanData = this.RunScan(ma, filterChain, startSeconds, scanDuration);
ma.cropValue = this.GetCommonCropValue(scanData);
if (videoStream.VideoHeight < 650 && videoStream.VideoHeight > 525)
{
ma.cropValue.YOffset += 32;
}
else if (videoStream.VideoHeight <= 525)
{
ma.cropValue.YOffset += 16;
}
}
//Only crop if we have a minimum of letterbox coverage
if (Math.Abs(ma.cropValue.YExtent - videoStream.VideoHeight) > 16)
{
ma.HasLetterbox = true;
//Crop to even values...
if (ma.cropValue.YExtent % 2 != 0)
{
ma.cropValue.YExtent--;
}
//Save pre-built crop filter for later use if desired.
ma.FFCropFilter = $"crop={videoStream.VideoWidth.ToString()}:{ma.cropValue.YExtent.ToString()}:0:{ma.cropValue.YOffset.ToString()}";
}
}