diff options
Diffstat (limited to 'MediaBrowser.Controller/MediaEncoding/EncodingHelper.cs')
| -rw-r--r-- | MediaBrowser.Controller/MediaEncoding/EncodingHelper.cs | 33 |
1 files changed, 23 insertions, 10 deletions
diff --git a/MediaBrowser.Controller/MediaEncoding/EncodingHelper.cs b/MediaBrowser.Controller/MediaEncoding/EncodingHelper.cs index 9d7d2fd12..a122f3d19 100644 --- a/MediaBrowser.Controller/MediaEncoding/EncodingHelper.cs +++ b/MediaBrowser.Controller/MediaEncoding/EncodingHelper.cs @@ -2586,8 +2586,9 @@ namespace MediaBrowser.Controller.MediaEncoding return 128000 * (outputAudioChannels ?? audioStream.Channels ?? 2); } - public string GetAudioVbrModeParam(string encoder, int bitratePerChannel) + public string GetAudioVbrModeParam(string encoder, int bitrate, int channels) { + var bitratePerChannel = bitrate / channels; if (string.Equals(encoder, "libfdk_aac", StringComparison.OrdinalIgnoreCase)) { return " -vbr:a " + bitratePerChannel switch @@ -2602,14 +2603,26 @@ namespace MediaBrowser.Controller.MediaEncoding if (string.Equals(encoder, "libmp3lame", StringComparison.OrdinalIgnoreCase)) { - return " -qscale:a " + bitratePerChannel switch + // lame's VBR is only good for a certain bitrate range + // For very low and very high bitrate, use abr mode + if (bitratePerChannel is < 122500 and > 48000) { - < 48000 => "8", - < 64000 => "6", - < 88000 => "4", - < 112000 => "2", - _ => "0" - }; + return " -qscale:a " + bitratePerChannel switch + { + < 64000 => "6", + < 88000 => "4", + < 112000 => "2", + _ => "0" + }; + } + + return " -abr:a 1" + " -b:a " + bitrate; + } + + if (string.Equals(encoder, "aac_at", StringComparison.OrdinalIgnoreCase)) + { + // aac_at's CVBR mode + return " -aac_at_mode:a 2" + " -b:a " + bitrate; } if (string.Equals(encoder, "libvorbis", StringComparison.OrdinalIgnoreCase)) @@ -6962,7 +6975,7 @@ namespace MediaBrowser.Controller.MediaEncoding var bitrate = state.OutputAudioBitrate; if (bitrate.HasValue && !LosslessAudioCodecs.Contains(codec, StringComparison.OrdinalIgnoreCase)) { - var vbrParam = GetAudioVbrModeParam(codec, bitrate.Value / (channels ?? 2)); + var vbrParam = GetAudioVbrModeParam(codec, bitrate.Value, channels ?? 2); if (encodingOptions.EnableAudioVbr && vbrParam is not null) { args += vbrParam; @@ -6993,7 +7006,7 @@ namespace MediaBrowser.Controller.MediaEncoding if (bitrate.HasValue && !LosslessAudioCodecs.Contains(outputCodec, StringComparison.OrdinalIgnoreCase)) { - var vbrParam = GetAudioVbrModeParam(GetAudioEncoder(state), bitrate.Value / (channels ?? 2)); + var vbrParam = GetAudioVbrModeParam(GetAudioEncoder(state), bitrate.Value, channels ?? 2); if (encodingOptions.EnableAudioVbr && vbrParam is not null) { audioTranscodeParams.Add(vbrParam); |