fix(mpv): auto-select subtitle and audio tracks on file open

src/qml/Actions.qml

@@ -389,7 +389,7 @@ Item {
     }
 
     property Action translateSubtitle: Action {
-        enabled: root.shortcutsEnabled && root.hasFile && root.mpv.subtitleId > 0 && !root.translator.busy
+        enabled: root.shortcutsEnabled && root.hasFile && root.mpv.subtitleTracks.some(track => !track.bitmap) && !root.translator.busy
         text: KI18n.i18nc("@action", "Translate Subtitle into %1", QtPotatoSettings.targetLanguage)
         icon.name: "translate"
         shortcut: "Ctrl+T"

src/qml/Main.qml

@@ -51,6 +51,11 @@ ApplicationWindow {
         if (track && translatedSubtitleUrls.includes(track.externalFilename) && lastTranslationTrack) {
             track = video.subtitleTracks.find(track => track.id === lastTranslationTrack.id)
         }
+        // No subtitle shown, or a picture-based one: translate the best text subtitle.
+        if (!track || track.bitmap) {
+            const sourceId = video.translationSourceId()
+            track = video.subtitleTracks.find(track => track.id === sourceId)
+        }
         if (track) {
             lastTranslationTrack = track
             lastTranslationVideo = video.currentUrl

src/qml/MpvVideo.qml

@@ -34,6 +34,9 @@ MpvItem {
     Kirigami.Theme.inherit: false
 
     loadUserConfig: QtPotatoSettings.loadMpvConfig
+    preferredAudioLanguages: QtPotatoSettings.preferredAudioLanguages
+    preferredSubtitleLanguages: QtPotatoSettings.preferredSubtitleLanguages
+    autoSelectSubtitle: QtPotatoSettings.autoSelectSubtitle
 
     // Set once the saved volume is applied; mpv reports its default volume before that.
     property bool volumeRestored: false

src/qml/PlaybackSettings.qml

@@ -72,5 +72,25 @@ SettingsBasePage {
                 QtPotatoSettings.save()
             }
         }
+
+        RowLayout {
+            spacing: Kirigami.Units.smallSpacing
+            Kirigami.FormData.label: KI18n.i18nc("@label:textbox", "Preferred languages")
+            Kirigami.FormData.buddyFor: audioLanguagesField
+
+            TextField {
+                id: audioLanguagesField
+                text: QtPotatoSettings.preferredAudioLanguages.join(", ")
+                placeholderText: KI18n.i18nc("@info:placeholder language codes", "e.g. ja, en")
+                onEditingFinished: {
+                    QtPotatoSettings.preferredAudioLanguages = text.split(/[,;\s]+/).filter(Boolean)
+                    QtPotatoSettings.save()
+                }
+            }
+
+            ToolTipButton {
+                toolTipText: KI18n.i18nc("@info:tooltip", "Audio track turned on when a file opens, first match wins. Use language codes or English names, separated by commas. Leave empty to keep the file's default track.")
+            }
+        }
     }
 }

src/qml/SubtitlesSettings.qml

@@ -13,6 +13,49 @@ SettingsBasePage {
 
     Kirigami.FormLayout {
 
+        SettingsHeader {
+            text: KI18n.i18nc("@title", "Track Selection")
+            Layout.fillWidth: true
+        }
+
+        RowLayout {
+            spacing: Kirigami.Units.smallSpacing
+            Kirigami.FormData.label: KI18n.i18nc("@label:textbox", "Preferred languages")
+            Kirigami.FormData.buddyFor: subtitleLanguagesField
+
+            TextField {
+                id: subtitleLanguagesField
+                text: QtPotatoSettings.preferredSubtitleLanguages.join(", ")
+                placeholderText: KI18n.i18nc("@info:placeholder language codes", "e.g. vi, en")
+                onEditingFinished: {
+                    QtPotatoSettings.preferredSubtitleLanguages = text.split(/[,;\s]+/).filter(Boolean)
+                    QtPotatoSettings.save()
+                }
+            }
+
+            ToolTipButton {
+                toolTipText: KI18n.i18nc("@info:tooltip", "Subtitle turned on when a file opens, first match wins. Use language codes or English names, separated by commas. Subtitle files next to the video count too.")
+            }
+        }
+
+        CheckBox {
+            text: KI18n.i18nc("@option:check", "Turn on a subtitle when none matches")
+            checked: QtPotatoSettings.autoSelectSubtitle
+            onToggled: {
+                QtPotatoSettings.autoSelectSubtitle = checked
+                QtPotatoSettings.save()
+            }
+
+            ToolTip.text: KI18n.i18nc("@info:tooltip", "Many files have no default subtitle, so they open with subtitles off. Picks one in the system language instead, then English, then the audio language.")
+            ToolTip.visible: hovered
+            ToolTip.delay: Kirigami.Units.toolTipDelay
+        }
+
+        SettingsHeader {
+            text: KI18n.i18nc("@title", "Appearance")
+            Layout.fillWidth: true
+        }
+
         RowLayout {
             spacing: Kirigami.Units.smallSpacing
             Kirigami.FormData.label: KI18n.i18nc("@label:spinbox", "Font size")