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Use VBR and MBBRC in QSV encoders for better quality (#14079)

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Nyanmisaka 2025-05-09 04:43:13 +08:00 committed by GitHub
parent a7bb3ea214
commit 07093c84c8
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1 changed files with 20 additions and 0 deletions
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20
MediaBrowser.Controller/MediaEncoding/EncodingHelper.cs
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@ -1572,6 +1572,26 @@ namespace MediaBrowser.Controller.MediaEncoding
return FormattableString.Invariant($" -maxrate {bitrate} -bufsize {bufsize}");
}
if (string.Equals(videoCodec, "h264_qsv", StringComparison.OrdinalIgnoreCase)
|| string.Equals(videoCodec, "hevc_qsv", StringComparison.OrdinalIgnoreCase)
|| string.Equals(videoCodec, "av1_qsv", StringComparison.OrdinalIgnoreCase))
{
// TODO: probe QSV encoders' capabilities and enable more tuning options
// See also https://github.com/intel/media-delivery/blob/master/doc/quality.rst
// Enable MacroBlock level bitrate control for better subjective visual quality
var mbbrcOpt = string.Empty;
if (string.Equals(videoCodec, "h264_qsv", StringComparison.OrdinalIgnoreCase)
|| string.Equals(videoCodec, "hevc_qsv", StringComparison.OrdinalIgnoreCase))
{
mbbrcOpt = " -mbbrc 1";
}
// Set (maxrate == bitrate + 1) to trigger VBR for better bitrate allocation
// Set (rc_init_occupancy == 2 * bitrate) and (bufsize == 4 * bitrate) to deal with drastic scene changes
return FormattableString.Invariant($"{mbbrcOpt} -b:v {bitrate} -maxrate {bitrate + 1} -rc_init_occupancy {bitrate * 2} -bufsize {bitrate * 4}");
}
if (string.Equals(videoCodec, "h264_amf", StringComparison.OrdinalIgnoreCase)
|| string.Equals(videoCodec, "hevc_amf", StringComparison.OrdinalIgnoreCase)
|| string.Equals(videoCodec, "av1_amf", StringComparison.OrdinalIgnoreCase))