SublerApp · brettpynn · Aug 6, 2026 · Aug 7, 2026 · Aug 21, 2026 · Aug 21, 2026
diff --git a/Base.lproj/MainMenu.xib b/Base.lproj/MainMenu.xib
@@ -1,8 +1,8 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<document type="com.apple.InterfaceBuilder3.Cocoa.XIB" version="3.0" toolsVersion="24127" targetRuntime="MacOSX.Cocoa" propertyAccessControl="none" useAutolayout="YES">
+<document type="com.apple.InterfaceBuilder3.Cocoa.XIB" version="3.0" toolsVersion="24506" targetRuntime="MacOSX.Cocoa" propertyAccessControl="none" useAutolayout="YES">
     <dependencies>
         <deployment identifier="macosx"/>
-        <plugIn identifier="com.apple.InterfaceBuilder.CocoaPlugin" version="24127"/>
+        <plugIn identifier="com.apple.InterfaceBuilder.CocoaPlugin" version="24506"/>
     </dependencies>
     <objects>
         <customObject id="-2" userLabel="File's Owner" customClass="NSApplication">
@@ -265,6 +265,12 @@ CA
                                     <action selector="showTrackOffsetSheet:" target="-1" id="570"/>
                                 </connections>
                             </menuItem>
+                            <menuItem title="Clear tracks offsets" keyEquivalent="t" id="cTo-Cl-rOf">
+                                <modifierMask key="keyEquivalentModifierMask" option="YES"/>
+                                <connections>
+                                    <action selector="clearTrackOffsets:" target="-1" id="cTo-Ac-rOf"/>
+                                </connections>
+                            </menuItem>
                             <menuItem title="Insert a Chapter" id="573">
                                 <modifierMask key="keyEquivalentModifierMask"/>
                                 <menu key="submenu" title="Insert a Chapter" id="574">
@@ -465,7 +471,8 @@ CA
                                     <action selector="performMiniaturize:" target="-1" id="37"/>
                                 </connections>
                             </menuItem>
-                            <menuItem title="Zoom" id="239">
+                            <menuItem title="Zoom" keyEquivalent="z" id="239">
+                                <modifierMask key="keyEquivalentModifierMask" control="YES" command="YES"/>
                                 <connections>
                                     <action selector="performZoom:" target="-1" id="240"/>
                                 </connections>

diff --git a/Base.lproj/QueueOptions.xib b/Base.lproj/QueueOptions.xib
@@ -16,7 +16,7 @@
         <customObject id="-1" userLabel="First Responder" customClass="FirstResponder"/>
         <customObject id="-3" userLabel="Application" customClass="NSObject"/>
         <customView id="UlG-O3-eNc" userLabel="OptionsView">
-            <rect key="frame" x="0.0" y="0.0" width="382" height="642"/>
+            <rect key="frame" x="0.0" y="0.0" width="382" height="664"/>
             <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMinY="YES"/>
             <subviews>
                 <button verticalHuggingPriority="251" translatesAutoresizingMaskIntoConstraints="NO" id="zEH-aV-Tl7">
@@ -527,8 +527,22 @@
                         </binding>
                     </connections>
                 </button>
+                <button toolTip="Remove start offsets from all tracks" verticalHuggingPriority="752" translatesAutoresizingMaskIntoConstraints="NO" id="cTo-Of-Btn">
+                    <rect key="frame" x="111" y="360" width="124" height="16"/>
+                    <buttonCell key="cell" type="check" title="Clear tracks offsets" bezelStyle="regularSquare" imagePosition="left" alignment="left" controlSize="small" inset="2" id="cTo-Of-Cel">
+                        <behavior key="behavior" changeContents="YES" doesNotDimImage="YES" lightByContents="YES"/>
+                        <font key="font" metaFont="label" size="11"/>
+                    </buttonCell>
+                    <connections>
+                        <binding destination="-2" name="value" keyPath="self.options.clearTrackOffset" id="cTo-Of-Bnd">
+                            <dictionary key="options">
+                                <bool key="NSValidatesImmediately" value="YES"/>
+                            </dictionary>
+                        </binding>
+                    </connections>
+                </button>
                 <button toolTip="Rename audio tracks according to channel count (Mono, Stereo, Surround)" verticalHuggingPriority="753" translatesAutoresizingMaskIntoConstraints="NO" id="81E-pQ-vyQ">
-                    <rect key="frame" x="111" y="360" width="159" height="16"/>
+                    <rect key="frame" x="111" y="340" width="159" height="16"/>
                     <buttonCell key="cell" type="check" title="Prettify audio track names" bezelStyle="regularSquare" imagePosition="left" alignment="left" controlSize="small" state="on" inset="2" id="akF-dR-OPB" userLabel="Prettify audio track names">
                         <behavior key="behavior" changeContents="YES" doesNotDimImage="YES" lightByContents="YES"/>
                         <font key="font" metaFont="label" size="11"/>
@@ -847,10 +861,13 @@
                 <constraint firstItem="etc-K7-Atw" firstAttribute="leading" secondItem="S7L-mA-j3Y" secondAttribute="trailing" constant="7" id="lRh-Vo-1XH"/>
                 <constraint firstItem="KWg-Ak-bB6" firstAttribute="firstBaseline" secondItem="muY-E0-hVI" secondAttribute="firstBaseline" id="lu4-VE-F0x"/>
                 <constraint firstItem="22k-mA-HyA" firstAttribute="top" secondItem="etc-K7-Atw" secondAttribute="bottom" constant="6" symbolic="YES" id="mRD-fX-qMt"/>
+                <constraint firstItem="cTo-Of-Btn" firstAttribute="top" secondItem="22k-mA-HyA" secondAttribute="bottom" constant="6" symbolic="YES" id="cTo-Of-Top"/>
+                <constraint firstItem="cTo-Of-Btn" firstAttribute="leading" secondItem="S7L-mA-j3Y" secondAttribute="trailing" constant="7" id="cTo-Of-Ld"/>
+                <constraint firstAttribute="trailing" relation="greaterThanOrEqual" secondItem="cTo-Of-Btn" secondAttribute="trailing" constant="20" symbolic="YES" id="cTo-Of-Tr"/>
                 <constraint firstItem="86l-GG-SpO" firstAttribute="top" secondItem="DVM-Js-DwK" secondAttribute="bottom" constant="4" id="mYq-MI-cyr"/>
                 <constraint firstItem="ZZk-4j-Ji7" firstAttribute="top" secondItem="slL-2h-MPl" secondAttribute="bottom" constant="4" id="n9b-Ub-usn"/>
                 <constraint firstItem="08Q-2k-0Gb" firstAttribute="baseline" secondItem="k33-Yf-DbF" secondAttribute="baseline" id="nPl-tv-zwn"/>
-                <constraint firstItem="81E-pQ-vyQ" firstAttribute="top" secondItem="22k-mA-HyA" secondAttribute="bottom" constant="6" symbolic="YES" id="ntR-jS-xXX"/>
+                <constraint firstItem="81E-pQ-vyQ" firstAttribute="top" secondItem="cTo-Of-Btn" secondAttribute="bottom" constant="6" symbolic="YES" id="ntR-jS-xXX"/>
                 <constraint firstItem="5rh-cM-iOg" firstAttribute="top" secondItem="ZVm-yi-3cE" secondAttribute="bottom" constant="4" id="o3T-cH-W5B"/>
                 <constraint firstItem="5rh-cM-iOg" firstAttribute="leading" secondItem="73q-gi-fe2" secondAttribute="trailing" constant="9" id="oAW-Hc-PIL"/>
                 <constraint firstItem="s8r-Cf-VfB" firstAttribute="leading" secondItem="9GN-f6-r2j" secondAttribute="leading" id="oUh-bK-O8z"/>

diff --git a/Classes/DocumentToolbarDelegate.swift b/Classes/DocumentToolbarDelegate.swift
@@ -78,6 +78,9 @@ class DocumentToolbarDelegate: NSObject, NSToolbarDelegate {
                          action: #selector(DocumentWindowController.fixAudioFallbacks(_:)),
                          keyEquivalent: "")
             menu.addItem(NSMenuItem.separator())
+            menu.addItem(withTitle: NSLocalizedString("Clear tracks offsets", comment: "Toolbar"),
+                         action: #selector(DocumentWindowController.clearTrackOffsets(_:)),
+                         keyEquivalent: "")
             menu.addItem(withTitle: NSLocalizedString("Offset…", comment: "Toolbar"),
                          action: #selector(DocumentWindowController.showTrackOffsetSheet(_:)),
                          keyEquivalent: "")

diff --git a/Classes/DocumentWindowController.swift b/Classes/DocumentWindowController.swift
@@ -230,6 +230,7 @@ final class DocumentWindowController: NSWindowController, TracksViewControllerDe
              #selector(addChaptersEvery(_:)),
              #selector(iTunesFriendlyTrackGroups(_:)),
              #selector(clearTrackNames(_:)),
+             #selector(clearTrackOffsets(_:)),
              #selector(prettifyAudioTrackNames(_:)),
              #selector(fixAudioFallbacks(_:)),
              #selector(sendToQueue(_:)):
@@ -342,6 +343,13 @@ final class DocumentWindowController: NSWindowController, TracksViewControllerDe
         tracksViewController.reloadData()
     }
 
+    @IBAction func clearTrackOffsets(_ sender: Any) {
+        mp4.clearTrackOffsets()
+
+        doc.updateChangeCount(.changeDone)
+        tracksViewController.reloadData()
+    }
+
     @IBAction func prettifyAudioTrackNames(_ sender: Any) {
 
         for track in mp4.tracks.compactMap({ $0 as? MP42AudioTrack }) {

diff --git a/Classes/MP42FileAdditions.swift b/Classes/MP42FileAdditions.swift
@@ -117,6 +117,14 @@ extension MP42File {
 
         return name.isEmpty ? nil : name
     }
+
+    func clearTrackOffsets() {
+        for track in tracks {
+            if track.startOffset != 0 {
+                track.startOffset = 0
+            }
+        }
+    }
 }
 
 extension MP42AudioTrack {

diff --git a/Classes/QueueAction.swift b/Classes/QueueAction.swift
@@ -442,6 +442,26 @@ class QueueClearTrackNameAction : NSObject, QueueActionProtocol {
 
 }
 
+/// An action that removes track start offsets.
+class QueueClearTrackOffsetAction : NSObject, QueueActionProtocol {
+
+    var type: QueueActionType { return .pre }
+    var localizedDescription: String { return NSLocalizedString("Clearing tracks offsets", comment: "Action localized description") }
+    override var description: String { return NSLocalizedString("Clear tracks offsets", comment: "Action description") }
+
+    override init() {}
+
+    func runAction(_ item: QueueItem) -> Bool {
+        item.mp4File?.clearTrackOffsets()
+        return true
+    }
+
+    func encode(with aCoder: NSCoder) {}
+    required init?(coder aDecoder: NSCoder) {}
+    static var supportsSecureCoding: Bool { return true }
+
+}
+
 /// An action that renames audio tracks.
 class QueuePrettifyAudioTrackNameAction : NSObject, QueueActionProtocol {
 

diff --git a/Classes/QueueController.swift b/Classes/QueueController.swift
@@ -281,6 +281,9 @@ final class QueueController : NSWindowController, NSWindowDelegate, NSPopoverDel
         if prefs.clearTrackName {
             item.addAction(QueueClearTrackNameAction())
         }
+        if prefs.clearTrackOffset {
+            item.addAction(QueueClearTrackOffsetAction())
+        }
         if prefs.prettifyAudioTrackName {
             item.addAction(QueuePrettifyAudioTrackNameAction())
         }

diff --git a/Classes/QueueItem.swift b/Classes/QueueItem.swift
@@ -456,7 +456,7 @@ import MP42Foundation
         actionsInternal = aDecoder.decodeObject(of: [NSArray.classForCoder(), QueueSetAction.classForCoder(),
                                                      QueueMetadataAction.classForCoder(), QueueSubtitlesAction.classForCoder(),
                                                      QueueSetLanguageAction.classForCoder(), QueueFixFallbacksAction.classForCoder(),
-                                                     QueueClearTrackNameAction.classForCoder(), QueuePrettifyAudioTrackNameAction.classForCoder(),
+                                                     QueueClearTrackNameAction.classForCoder(), QueueClearTrackOffsetAction.classForCoder(), QueuePrettifyAudioTrackNameAction.classForCoder(),
                                                      QueueRenameChaptersAction.classForCoder(),
                                                      QueueOrganizeGroupsAction.classForCoder(), QueueColorSpaceAction.classForCoder(),
                                                      QueueSetOutputFilenameAction.classForCoder(), QueueClearExistingMetadataAction.classForCoder(),

diff --git a/Classes/QueuePreferences.swift b/Classes/QueuePreferences.swift
@@ -13,6 +13,7 @@ final class QueuePreferences: NSObject {
     static private let SBQueueOrganize: String = "SBQueueOrganize"
     static private let SBQueueFixFallbacks: String = "SBQueueFixFallbacks"
     static private let SBQueueClearTrackName: String = "SBQueueClearTrackName"
+    static private let SBQueueClearTrackOffset: String = "SBQueueClearTrackOffset"
     static private let SBQueuePrettifyAudioTrackName: String = "SBQueuePrettifyAudioTrackName"
     static private let SBQueueRenameChapters: String = "SBQueueRenameChapters"
     static private let SBQueueMetadata: String = "SBQueueMetadata"
@@ -60,6 +61,7 @@ final class QueuePreferences: NSObject {
     @objc dynamic var organize: Bool
     @objc dynamic var fixFallbacks: Bool
     @objc dynamic var clearTrackName: Bool
+    @objc dynamic var clearTrackOffset: Bool
     @objc dynamic var prettifyAudioTrackName: Bool
     @objc dynamic var renameChapters: Bool
     @objc dynamic var subtitles: Bool
@@ -104,6 +106,7 @@ final class QueuePreferences: NSObject {
         self.organize = ud.bool(forKey: QueuePreferences.SBQueueOrganize)
         self.fixFallbacks = ud.bool(forKey: QueuePreferences.SBQueueFixFallbacks)
         self.clearTrackName = ud.bool(forKey: QueuePreferences.SBQueueClearTrackName)
+        self.clearTrackOffset = ud.bool(forKey: QueuePreferences.SBQueueClearTrackOffset)
         self.prettifyAudioTrackName = ud.bool(forKey: QueuePreferences.SBQueuePrettifyAudioTrackName)
         self.renameChapters = ud.bool(forKey: QueuePreferences.SBQueueRenameChapters)
         self.subtitles = ud.bool(forKey: QueuePreferences.SBQueueSubtitles)
@@ -146,6 +149,7 @@ final class QueuePreferences: NSObject {
                      QueuePreferences.SBQueueFixTrackLanguageValue: "en",
                      QueuePreferences.SBQueueFixFallbacks: false,
                      QueuePreferences.SBQueueClearTrackName: false,
+                     QueuePreferences.SBQueueClearTrackOffset: false,
                      QueuePreferences.SBQueuePrettifyAudioTrackName: false,
                      QueuePreferences.SBQueueRenameChapters: false,
                      QueuePreferences.SBQueueMetadata: false,
@@ -186,6 +190,7 @@ final class QueuePreferences: NSObject {
         ud.set(organize, forKey: QueuePreferences.SBQueueOrganize)
         ud.set(fixFallbacks, forKey: QueuePreferences.SBQueueFixFallbacks)
         ud.set(clearTrackName, forKey: QueuePreferences.SBQueueClearTrackName)
+        ud.set(clearTrackOffset, forKey: QueuePreferences.SBQueueClearTrackOffset)
         ud.set(prettifyAudioTrackName, forKey: QueuePreferences.SBQueuePrettifyAudioTrackName)
         ud.set(renameChapters, forKey: QueuePreferences.SBQueueRenameChapters)
         ud.set(subtitles, forKey: QueuePreferences.SBQueueSubtitles)

diff --git a/Classes/ScriptCommand.swift b/Classes/ScriptCommand.swift
@@ -288,6 +288,28 @@ class SBClearTrackNamesScriptCommand: NSScriptCommand, ScriptCommandDocumentTarg
     }
 }
 
+@objc(SBClearTrackOffsetsScriptCommand)
+class SBClearTrackOffsetsScriptCommand: NSScriptCommand, ScriptCommandDocumentTargeting {
+
+    override func performDefaultImplementation() -> Any? {
+        let logger = Logger.shared
+        guard let sublerDoc = targetedDocument() else {
+            logger.write(toLog: "No document available for clearing track offsets")
+            return nil
+        }
+
+        // Use the existing IBAction instead of duplicating logic
+        if let windowController = sublerDoc.windowControllers.first as? DocumentWindowController {
+            windowController.clearTrackOffsets(self)
+            logger.write(toLog: "Script successfully cleared all track offsets")
+        } else {
+            logger.write(toLog: "No window controller found for clearing track offsets")
+        }
+
+        return nil
+    }
+}
+
 @objc(SBPrettifyAudioTrackNamesScriptCommand)
 class SBPrettifyAudioTrackNamesScriptCommand: NSScriptCommand, ScriptCommandDocumentTargeting {
 

diff --git a/MP42Foundation b/MP42Foundation
diff --git a/Subler.sdef b/Subler.sdef
@@ -77,6 +77,11 @@
             <parameter name="into" code="into" type="document" optional="yes" description="The target document to clear track names for." />
         </command>
 
+        <command name="clear track offsets" code="SublClOf" description="Clear all track offsets.">
+            <cocoa class="SBClearTrackOffsetsScriptCommand" />
+            <parameter name="into" code="into" type="document" optional="yes" description="The target document to clear track offsets for." />
+        </command>
+
         <command name="prettify audio track names" code="SublPret" description="Prettify audio track names.">
             <cocoa class="SBPrettifyAudioTrackNamesScriptCommand" />
             <parameter name="into" code="into" type="document" optional="yes" description="The target document to prettify audio track names for." />
+2 −2		MP42/MP42AVFImporter.m
+0 −2		MP42/MP42Track.h
+18 −45		MP42/MP42Track.m
+1 −1		MP42Foundation.xcodeproj/xcshareddata/xcschemes/MP42Foundation.xcscheme
+1 −1		MP42Foundation.xcodeproj/xcshareddata/xcschemes/mp42.xcscheme