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Merge pull request #9388 from Shadowghost/output-bitrate-channels-master

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This commit is contained in:
Bond-009
2023-03-20 17:46:11 +01:00
committed by GitHub
parent dd491ce8ff e57c33c442
commit 2ce08eb184
7 changed files with 213 additions and 66 deletions
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172
MediaBrowser.Controller/MediaEncoding/EncodingHelper.cs
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@@ -89,6 +89,16 @@ namespace MediaBrowser.Controller.MediaEncoding
{ "truehd", 6 },
};
public static readonly string[] LosslessAudioCodecs = new string[]
{
"alac",
"ape",
"flac",
"mlp",
"truehd",
"wavpack"
};
public EncodingHelper(
IApplicationPaths appPaths,
IMediaEncoder mediaEncoder,
@@ -620,6 +630,11 @@ namespace MediaBrowser.Controller.MediaEncoding
return "flac";
}
if (string.Equals(codec, "dts", StringComparison.OrdinalIgnoreCase))
{
return "dca";
}
return codec.ToLowerInvariant();
}
@@ -2050,9 +2065,9 @@ namespace MediaBrowser.Controller.MediaEncoding
}
}
// Video bitrate must fall within requested value
// Audio bitrate must fall within requested value
if (request.AudioBitRate.HasValue
&& audioStream.BitDepth.HasValue
&& audioStream.BitRate.HasValue
&& audioStream.BitRate.Value > request.AudioBitRate.Value)
{
return false;
@@ -2161,56 +2176,96 @@ namespace MediaBrowser.Controller.MediaEncoding
return Convert.ToInt32(scaleFactor * bitrate);
}
public int? GetAudioBitrateParam(BaseEncodingJobOptions request, MediaStream audioStream)
public int? GetAudioBitrateParam(BaseEncodingJobOptions request, MediaStream audioStream, int? outputAudioChannels)
{
return GetAudioBitrateParam(request.AudioBitRate, request.AudioCodec, audioStream);
return GetAudioBitrateParam(request.AudioBitRate, request.AudioCodec, audioStream, outputAudioChannels);
}
public int? GetAudioBitrateParam(int? audioBitRate, string audioCodec, MediaStream audioStream)
public int? GetAudioBitrateParam(int? audioBitRate, string audioCodec, MediaStream audioStream, int? outputAudioChannels)
{
if (audioStream is null)
{
return null;
}
if (audioBitRate.HasValue && string.IsNullOrEmpty(audioCodec))
var inputChannels = audioStream.Channels ?? 0;
var outputChannels = outputAudioChannels ?? 0;
var bitrate = audioBitRate ?? int.MaxValue;
if (string.IsNullOrEmpty(audioCodec)
|| string.Equals(audioCodec, "aac", StringComparison.OrdinalIgnoreCase)
|| string.Equals(audioCodec, "mp3", StringComparison.OrdinalIgnoreCase)
|| string.Equals(audioCodec, "opus", StringComparison.OrdinalIgnoreCase)
|| string.Equals(audioCodec, "vorbis", StringComparison.OrdinalIgnoreCase)
|| string.Equals(audioCodec, "ac3", StringComparison.OrdinalIgnoreCase)
|| string.Equals(audioCodec, "eac3", StringComparison.OrdinalIgnoreCase))
{
return Math.Min(384000, audioBitRate.Value);
return (inputChannels, outputChannels) switch
{
(>= 6, >= 6 or 0) => Math.Min(640000, bitrate),
(> 0, > 0) => Math.Min(outputChannels * 128000, bitrate),
(> 0, _) => Math.Min(inputChannels * 128000, bitrate),
(_, _) => Math.Min(384000, bitrate)
};
}
if (audioBitRate.HasValue && !string.IsNullOrEmpty(audioCodec))
if (string.Equals(audioCodec, "dts", StringComparison.OrdinalIgnoreCase)
|| string.Equals(audioCodec, "dca", StringComparison.OrdinalIgnoreCase))
{
if (string.Equals(audioCodec, "aac", StringComparison.OrdinalIgnoreCase)
|| string.Equals(audioCodec, "mp3", StringComparison.OrdinalIgnoreCase)
|| string.Equals(audioCodec, "opus", StringComparison.OrdinalIgnoreCase)
|| string.Equals(audioCodec, "vorbis", StringComparison.OrdinalIgnoreCase)
|| string.Equals(audioCodec, "ac3", StringComparison.OrdinalIgnoreCase)
|| string.Equals(audioCodec, "eac3", StringComparison.OrdinalIgnoreCase))
return (inputChannels, outputChannels) switch
{
if ((audioStream.Channels ?? 0) >= 6)
{
return Math.Min(640000, audioBitRate.Value);
}
return Math.Min(384000, audioBitRate.Value);
}
if (string.Equals(audioCodec, "flac", StringComparison.OrdinalIgnoreCase)
|| string.Equals(audioCodec, "alac", StringComparison.OrdinalIgnoreCase))
{
if ((audioStream.Channels ?? 0) >= 6)
{
return Math.Min(3584000, audioBitRate.Value);
}
return Math.Min(1536000, audioBitRate.Value);
}
(>= 6, >= 6 or 0) => Math.Min(768000, bitrate),
(> 0, > 0) => Math.Min(outputChannels * 136000, bitrate),
(> 0, _) => Math.Min(inputChannels * 136000, bitrate),
(_, _) => Math.Min(672000, bitrate)
};
}
// Empty bitrate area is not allow on iOS
// Default audio bitrate to 128K if it is not being requested
// Default audio bitrate to 128K per channel if we don't have codec specific defaults
// https://ffmpeg.org/ffmpeg-codecs.html#toc-Codec-Options
return 128000;
return 128000 * (outputAudioChannels ?? audioStream.Channels ?? 2);
}
public string GetAudioVbrModeParam(string encoder, int bitratePerChannel)
{
if (string.Equals(encoder, "libfdk_aac", StringComparison.OrdinalIgnoreCase))
{
return " -vbr:a " + bitratePerChannel switch
{
< 32000 => "1",
< 48000 => "2",
< 64000 => "3",
< 96000 => "4",
_ => "5"
};
}
if (string.Equals(encoder, "libmp3lame", StringComparison.OrdinalIgnoreCase))
{
return " -qscale:a " + bitratePerChannel switch
{
< 48000 => "8",
< 64000 => "6",
< 88000 => "4",
< 112000 => "2",
_ => "0"
};
}
if (string.Equals(encoder, "libvorbis", StringComparison.OrdinalIgnoreCase))
{
return " -qscale:a " + bitratePerChannel switch
{
< 40000 => "0",
< 56000 => "2",
< 80000 => "4",
< 112000 => "6",
_ => "8"
};
}
return null;
}
public string GetAudioFilterParam(EncodingJobInfo state, EncodingOptions encodingOptions)
@@ -5670,14 +5725,22 @@ namespace MediaBrowser.Controller.MediaEncoding
}
var inputChannels = audioStream is null ? 6 : audioStream.Channels ?? 6;
var shiftAudioCodecs = new List<string>();
if (inputChannels >= 6)
{
return;
// DTS and TrueHD are not supported by HLS
// Keep them in the supported codecs list, but shift them to the end of the list so that if transcoding happens, another codec is used
shiftAudioCodecs.Add("dca");
shiftAudioCodecs.Add("truehd");
}
else
{
// Transcoding to 2ch ac3 or eac3 almost always causes a playback failure
// Keep them in the supported codecs list, but shift them to the end of the list so that if transcoding happens, another codec is used
shiftAudioCodecs.Add("ac3");
shiftAudioCodecs.Add("eac3");
}
// Transcoding to 2ch ac3 almost always causes a playback failure
// Keep it in the supported codecs list, but shift it to the end of the list so that if transcoding happens, another codec is used
var shiftAudioCodecs = new[] { "ac3", "eac3" };
if (audioCodecs.All(i => shiftAudioCodecs.Contains(i, StringComparison.OrdinalIgnoreCase)))
{
return;
@@ -5919,10 +5982,17 @@ namespace MediaBrowser.Controller.MediaEncoding
}
var bitrate = state.OutputAudioBitrate;
if (bitrate.HasValue)
if (bitrate.HasValue && !LosslessAudioCodecs.Contains(codec, StringComparison.OrdinalIgnoreCase))
{
args += " -ab " + bitrate.Value.ToString(CultureInfo.InvariantCulture);
var vbrParam = GetAudioVbrModeParam(codec, bitrate.Value / (channels ?? 2));
if (encodingOptions.EnableAudioVbr && vbrParam is not null)
{
args += vbrParam;
}
else
{
args += " -ab " + bitrate.Value.ToString(CultureInfo.InvariantCulture);
}
}
if (state.OutputAudioSampleRate.HasValue)
@@ -5940,23 +6010,33 @@ namespace MediaBrowser.Controller.MediaEncoding
var audioTranscodeParams = new List<string>();
var bitrate = state.OutputAudioBitrate;
var channels = state.OutputAudioChannels;
var outputCodec = state.OutputAudioCodec;
if (bitrate.HasValue)
if (bitrate.HasValue && !LosslessAudioCodecs.Contains(outputCodec, StringComparison.OrdinalIgnoreCase))
{
audioTranscodeParams.Add("-ab " + bitrate.Value.ToString(CultureInfo.InvariantCulture));
var vbrParam = GetAudioVbrModeParam(outputCodec, bitrate.Value / (channels ?? 2));
if (encodingOptions.EnableAudioVbr && vbrParam is not null)
{
audioTranscodeParams.Add(vbrParam);
}
else
{
audioTranscodeParams.Add("-ab " + bitrate.Value.ToString(CultureInfo.InvariantCulture));
}
}
if (state.OutputAudioChannels.HasValue)
if (channels.HasValue)
{
audioTranscodeParams.Add("-ac " + state.OutputAudioChannels.Value.ToString(CultureInfo.InvariantCulture));
}
if (!string.IsNullOrEmpty(state.OutputAudioCodec))
if (!string.IsNullOrEmpty(outputCodec))
{
audioTranscodeParams.Add("-acodec " + GetAudioEncoder(state));
}
if (!string.Equals(state.OutputAudioCodec, "opus", StringComparison.OrdinalIgnoreCase))
if (!string.Equals(outputCodec, "opus", StringComparison.OrdinalIgnoreCase))
{
// opus only supports specific sampling rates
var sampleRate = state.OutputAudioSampleRate;