fix Start stream 3 seconds behind edge

Jellyfin.Plugin.SRFPlay/Configuration/configPage.html

@@ -82,6 +82,11 @@
                         <input id="RecordingOutputPath" name="RecordingOutputPath" type="text" is="emby-input" placeholder="e.g., /media/recordings/srf" />
                         <div class="fieldDescription">Directory where sport livestream recordings will be saved (requires ffmpeg)</div>
                     </div>
+                    <div class="inputContainer">
+                        <label class="inputLabel inputLabelUnfocused" for="LiveStartSegmentsBack">Live Start Offset (segments)</label>
+                        <input id="LiveStartSegmentsBack" name="LiveStartSegmentsBack" type="number" is="emby-input" min="0" max="20" />
+                        <div class="fieldDescription">How many segments back from the live edge livestreams start playing. Fixes jumpy/stalling playback at the start on Android TV. Minimum 3 (RFC requirement); 0 disables it. Default 3.</div>
+                    </div>
                     <br />
                     <h2>Network Settings</h2>
                     <div class="inputContainer">
@@ -148,6 +153,7 @@
                         document.querySelector('#ProxyPassword').value = config.ProxyPassword || '';
                         document.querySelector('#PublicServerUrl').value = config.PublicServerUrl || '';
                         document.querySelector('#RecordingOutputPath').value = config.RecordingOutputPath || '';
+                        document.querySelector('#LiveStartSegmentsBack').value = config.LiveStartSegmentsBack != null ? config.LiveStartSegmentsBack : 3;
                         Dashboard.hideLoadingMsg();
 
                         // Load recordings UI
@@ -173,6 +179,7 @@
                     config.ProxyPassword = document.querySelector('#ProxyPassword').value;
                     config.PublicServerUrl = document.querySelector('#PublicServerUrl').value;
                     config.RecordingOutputPath = document.querySelector('#RecordingOutputPath').value;
+                    config.LiveStartSegmentsBack = parseInt(document.querySelector('#LiveStartSegmentsBack').value) || 0;
                     ApiClient.updatePluginConfiguration(SRFPlayConfig.pluginUniqueId, config).then(function (result) {
                         Dashboard.processPluginConfigurationUpdateResult(result);
                     });