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Use strict QSV CPB size for less powerful H.264 decoder
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Signed-off-by: nyanmisaka <nst799610810@gmail.com>
This commit is contained in:
nyanmisaka
2026-05-02 20:14:51 +08:00
committed by Bond_009
parent f5f75ed2e1
commit d9ced0d639
1 changed files with 14 additions and 2 deletions
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16
MediaBrowser.Controller/MediaEncoding/EncodingHelper.cs
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@@ -1621,13 +1621,25 @@ namespace MediaBrowser.Controller.MediaEncoding
mbbrcOpt = " -mbbrc 1";
}
// Some less powerful H.264 HW decoders require strict CPB size
// So bufsize optimizations should not be applied to them
int factor = 2;
var codec = state.ActualOutputVideoCodec;
var level = state.GetRequestedLevel(codec);
if (string.Equals(codec, "h264", StringComparison.OrdinalIgnoreCase)
&& double.TryParse(level, CultureInfo.InvariantCulture, out double requestedLevel)
&& requestedLevel < 51)
{
factor = 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
// Use long arithmetic and clamp to int.MaxValue to prevent int32 overflow
// (e.g. bitrate * 4 wraps to a negative value for bitrates above ~537 million)
int qsvMaxrate = (int)Math.Min((long)bitrate + 1, int.MaxValue);
int qsvInitOcc = (int)Math.Min((long)bitrate * 2, int.MaxValue);
int qsvBufsize = (int)Math.Min((long)bitrate * 4, int.MaxValue);
int qsvInitOcc = (int)Math.Min((long)bitrate * 1 * factor, int.MaxValue);
int qsvBufsize = (int)Math.Min((long)bitrate * 2 * factor, int.MaxValue);
return FormattableString.Invariant($"{mbbrcOpt} -b:v {bitrate} -maxrate {qsvMaxrate} -rc_init_occupancy {qsvInitOcc} -bufsize {qsvBufsize}");
}