Speed up device snapshot cadence for a near-live thumbnail

Lower the default and minimum snapshot interval (10s/2s -> 2s/1s) and
refresh the selected device's thumbnail on its own 1s timer instead of
waiting for the 5s device-list poll, so the preview updates fast
enough to feel close to live video without building an actual
streaming pipeline.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

static/IPTV.py

@@ -1114,8 +1114,8 @@ def communication(data):
         except (TypeError, ValueError):
             sendMessage(toSidDevice, fromSidDevice, 'warning', 'Invalid snapshot interval', 0)
         else:
-            if interval_seconds < 2:
+            if interval_seconds < 1:
-                sendMessage(toSidDevice, fromSidDevice, 'warning', 'Snapshot interval must be at least 2 seconds', 0)
+                sendMessage(toSidDevice, fromSidDevice, 'warning', 'Snapshot interval must be at least 1 second', 0)
             else:
                 SNAPSHOT_INTERVAL_SECONDS = interval_seconds
                 sendMessage(
@@ -1302,7 +1302,7 @@ def initIPTV():
 
 # ----------------------------------------------------------------
 # ----------------------------------------------------------------
-num_version='5.0.6'
+num_version='5.0.7'
 # ----------------------------------------------------------------
 # ----------------------------------------------------------------
 
@@ -1328,7 +1328,7 @@ mediaRunning = ''
 status_vpn = 'disconnected'
 data_running = {}
 auto_snapshot_enabled = True
-SNAPSHOT_INTERVAL_SECONDS = 10
+SNAPSHOT_INTERVAL_SECONDS = 2
 POLLING_INTERVAL_SECONDS = 10
 SOCKET_CONNECT_TIMEOUT = 10
 SOCKET_RETRY_MIN_INTERVAL = 3

static/index.html

@@ -1220,7 +1220,7 @@
                     <div class="modal-body">
                         <div id="snapshotIntervalSettingsAlert"></div>
                         <label for="snapshot_interval_input" class="form-label">Seconds between 2 snapshots</label>
-                        <input type="number" min="2" step="1" class="form-control" id="snapshot_interval_input" placeholder="10">
+                        <input type="number" min="1" step="1" class="form-control" id="snapshot_interval_input" placeholder="2">
                         <div class="form-text">This value is applied to the currently selected device.</div>
                     </div>
                     <div class="modal-footer">
@@ -1528,7 +1528,7 @@
     var PROGRESS_STALE_MS = 15000
     var playlistImportProgress = 0
     var playlistImportInFlight = false
-    var selectedDeviceSnapshotIntervalSeconds = 10
+    var selectedDeviceSnapshotIntervalSeconds = 2
     var currentSelectedDeviceData = null
 
     var socket = io('https://iptv.mrk.ovh', {
@@ -1710,6 +1710,22 @@
         $placeholder.hide();
     }
 
+    // Reloads the currently selected device's snapshot image on its own fast
+    // timer, independent of the 5s full device-list poll, so a low snapshot
+    // interval (see Settings > Snapshot interval) actually feels near-live.
+    function refreshSelectedDeviceSnapshotFast() {
+        var device = currentSelectedDeviceData;
+        if (!device || !device.snapshot_url) {
+            return;
+        }
+        var dataRunning = device.data_running || {};
+        var hasChannel = Object.keys(dataRunning).length > 0 && dataRunning.name_channel;
+        if (!hasChannel) {
+            return;
+        }
+        $('#selectedDeviceSnapshot').attr('src', device.snapshot_url + '?t=' + Date.now());
+    }
+
     function updateAutoSnapshotToggle(device) {
         var $toggle = $('#autoSnapshotToggle');
         if (!device || !device.id_device) {
@@ -1723,12 +1739,12 @@
 
     function updateSnapshotIntervalState(device) {
         if (!device || !device.id_device) {
-            selectedDeviceSnapshotIntervalSeconds = 10;
+            selectedDeviceSnapshotIntervalSeconds = 2;
             return;
         }
 
         var interval = Number(device.snapshot_interval_seconds);
-        if (!Number.isFinite(interval) || interval < 2) {
+        if (!Number.isFinite(interval) || interval < 1) {
             interval = selectedDeviceSnapshotIntervalSeconds;
         }
         selectedDeviceSnapshotIntervalSeconds = interval;
@@ -1789,6 +1805,7 @@
         $(window).on('scroll resize', lazyLoad);
         updateListDevices()
         setInterval(updateListDevices, 5000)
+        setInterval(refreshSelectedDeviceSnapshotFast, 1000)
         update_list_playlist()
         display_most_frequent()
         setInterval(display_most_frequent, 15000)
@@ -3158,9 +3175,9 @@
         }
 
         var intervalValue = Number($('#snapshot_interval_input').val());
-        if (!Number.isInteger(intervalValue) || intervalValue < 2) {
+        if (!Number.isInteger(intervalValue) || intervalValue < 1) {
             $('#snapshot_interval_input').addClass('is-invalid');
-            $('#snapshotIntervalSettingsAlert').html('<div class="alert alert-danger" role="alert">Enter an integer value greater than or equal to 2.</div>');
+            $('#snapshotIntervalSettingsAlert').html('<div class="alert alert-danger" role="alert">Enter an integer value greater than or equal to 1.</div>');
             return;
         }