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Tune x264/5 encoding params for realtime playback

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Some options that are too performance-intensive are disabled, while
others are left enabled to trade-off between real-time playback and quality.

Signed-off-by: nyanmisaka <nst799610810@gmail.com>
This commit is contained in:
nyanmisaka 2024-08-30 00:56:44 +08:00
parent 84bbe86fd2
commit d7be6a5ab0
2 changed files with 5 additions and 14 deletions
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6
Jellyfin.Api/Controllers/DynamicHlsController.cs
View File

@ -45,6 +45,7 @@ public class DynamicHlsController : BaseJellyfinApiController
private const TranscodingJobType TranscodingJobType = MediaBrowser.Controller.MediaEncoding.TranscodingJobType.Hls;
private readonly Version _minFFmpegFlacInMp4 = new Version(6, 0);
private readonly Version _minFFmpegX265BframeInFmp4 = new Version(7, 0, 1);
private readonly ILibraryManager _libraryManager;
private readonly IUserManager _userManager;
@ -1851,13 +1852,12 @@ public class DynamicHlsController : BaseJellyfinApiController
args += _encodingHelper.GetHlsVideoKeyFrameArguments(state, codec, state.SegmentLength, isEventPlaylist, startNumber);
// Currently b-frames in libx265 breaks the FMP4-HLS playback on iOS, disable it for now.
if (string.Equals(codec, "libx265", StringComparison.OrdinalIgnoreCase))
if (string.Equals(codec, "libx265", StringComparison.OrdinalIgnoreCase)
&& _mediaEncoder.EncoderVersion < _minFFmpegX265BframeInFmp4)
{
args += " -bf 0";
}
// args += " -mixed-refs 0 -refs 3 -x264opts b_pyramid=0:weightb=0:weightp=0";
// video processing filters.
var videoProcessParam = _encodingHelper.GetVideoProcessingFilterParam(state, _encodingOptions, codec);

13
MediaBrowser.Controller/MediaEncoding/EncodingHelper.cs
View File

@ -1480,7 +1480,6 @@ namespace MediaBrowser.Controller.MediaEncoding
}
}
// TODO: Perhaps also use original_size=1920x800 ??
return string.Format(
CultureInfo.InvariantCulture,
"subtitles=f='{0}'{1}{2}{3}{4}{5}",
@ -1502,7 +1501,6 @@ namespace MediaBrowser.Controller.MediaEncoding
alphaParam,
sub2videoParam,
fontParam,
// fallbackFontParam,
setPtsParam);
}
@ -1776,12 +1774,6 @@ namespace MediaBrowser.Controller.MediaEncoding
{
param += " -preset veryfast";
}
// Only h264_qsv has look_ahead option
if (string.Equals(videoEncoder, "h264_qsv", StringComparison.OrdinalIgnoreCase))
{
param += " -look_ahead 0";
}
}
else if (string.Equals(videoEncoder, "h264_nvenc", StringComparison.OrdinalIgnoreCase) // h264 (h264_nvenc)
|| string.Equals(videoEncoder, "hevc_nvenc", StringComparison.OrdinalIgnoreCase) // hevc (hevc_nvenc)
@ -2068,7 +2060,7 @@ namespace MediaBrowser.Controller.MediaEncoding
if (string.Equals(videoEncoder, "libx264", StringComparison.OrdinalIgnoreCase))
{
param += " -x264opts:0 subme=0:me_range=4:rc_lookahead=10:me=dia:no_chroma_me:8x8dct=0:partitions=none";
param += " -x264opts:0 subme=0:me_range=16:rc_lookahead=10:me=hex:open_gop=0";
}
if (string.Equals(videoEncoder, "libx265", StringComparison.OrdinalIgnoreCase))
@ -2076,8 +2068,7 @@ namespace MediaBrowser.Controller.MediaEncoding
// libx265 only accept level option in -x265-params.
// level option may cause libx265 to fail.
// libx265 cannot adjust the given level, just throw an error.
// TODO: set fine tuned params.
param += " -x265-params:0 no-info=1";
param += " -x265-params:0 subme=3:merange=25:rc-lookahead=10:me=star:ctu=32:max-tu-size=32:min-cu-size=16:rskip=2:rskip-edge-threshold=2:no-sao=1:no-strong-intra-smoothing=1:no-scenecut=1:no-open-gop=1:no-info=1";
}
if (string.Equals(videoEncoder, "libsvtav1", StringComparison.OrdinalIgnoreCase)