Fixes (#18304)

* fix recordings check

* Only calculate inpoint offset for beginning of hour segment

* Cleanup

* Fix seeking

* add Czech

* explore i18n fix

---------

Co-authored-by: Nicolas Mowen <nickmowen213@gmail.com>

web/src/utils/videoUtil.ts

@@ -0,0 +1,26 @@
+import { Recording } from "@/types/record";
+
+/** the HLS endpoint returns the vod segments with the first
+ * segment of the hour trimmed, meaning it will start at
+ * the beginning of the hour, cutting off any difference
+ * that the segment has.
+ */
+export function calculateInpointOffset(
+  timeRangeStart: number | undefined,
+  firstRecordingSegment: Recording | undefined,
+): number {
+  if (!timeRangeStart || !firstRecordingSegment) {
+    return 0;
+  }
+
+  // if the first recording segment does not cross over
+  // the beginning of the time range then there is no offset
+  if (
+    firstRecordingSegment.start_time < timeRangeStart &&
+    firstRecordingSegment.end_time > timeRangeStart
+  ) {
+    return timeRangeStart - firstRecordingSegment.start_time;
+  }
+
+  return 0;
+}