/// <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);
}
}
/// <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>
/// 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>
/// Adds output definition to job.
/// </summary>
/// <param name="v">VideoOutputDefinition describing one video stream</param>
public void AddOutputMedia(VideoOutputDefinition v)
{
//Any pre--add work goes here...
this.OutputMedia.Add(v);
}