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feat: signed A/V sync offset (−500..+500), negative advances by eating live stream head (OBS eat-head semantics)

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Positive offsets still delay the whole mix via the delay line (lip-sync fix);
negative offsets now ARM once at StartLive and drop |N| ms off the pipe's write
head so audio events land earlier when audio runs BEHIND video. Slider relabeled
AUDIO SYNC, Min −500, locked while live/recording (IsEditMode). LayoutStore and
VM clamp to −500..500.

OBS reference for eat-the-head negative sync: https://obsproject.com/kb/obs-studio/buffering-time (negative sync values pull audio earlier by discarding buffered player audio).

Test: StartLive_NegativeOffset_AdvancesAudio_ByDroppingTheStreamHead (6x0.9 head
must be eaten before 0.2 bed reaches the wire).
This commit is contained in:
Llama Chile Shop
2026-09-14 12:30:44 -07:00
parent 11a7af2dc0
commit b22d08eca6
12 changed files with 219 additions and 144 deletions
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Controls/PreviewPane.xaml
+5 -4
View File
@@ -658,13 +658,14 @@
PreviewMouseLeftButtonUp="VolumeSlider_PreviewMouseLeftButtonUp"
LostMouseCapture="VolumeSlider_LostMouseCapture"/>
<StackPanel Orientation="Horizontal" Margin="10,0,0,0" VerticalAlignment="Center"
ToolTip="Audio sync delay (ms): add a few ms so the mic/audio lands on the video when it runs ahead.">
<TextBlock Text="SYNC" FontSize="9" Foreground="#9898aa"
ToolTip="Audio sync (−500..+500 ms). Positive: delays the audio when it runs ahead of the video. Negative: advances it (drops the first |N| ms of the recording) when it runs behind. Calibrate with a clap: is the clap late in the video, move negative; early, move positive.">
<TextBlock Text="AUDIO SYNC" FontSize="9" Foreground="#9898aa"
VerticalAlignment="Center" Margin="0,0,5,0"/>
<Slider Width="70" Minimum="0" Maximum="500"
<Slider Width="70" Minimum="-500" Maximum="500"
Value="{Binding AudioSyncOffsetMs, Mode=TwoWay}"
IsEnabled="{Binding IsEditMode}"
VerticalAlignment="Center"
ToolTip="{Binding AudioSyncOffsetMs, StringFormat=Sync delay: {0} ms}"/>
ToolTip="{Binding AudioSyncOffsetMs, StringFormat=Audio sync: {0} ms}"/>
<Border Width="8" Height="8" CornerRadius="4" Margin="6,0,0,0"
VerticalAlignment="Center"
Background="{Binding AudioSyncOffsetMs, Converter={StaticResource IntToSyncBrush}}"/>