message: Fix duration placeholder parsing for audio files
diff: @@ -103,8 +103,8 @@ export class PlaybackClock implements IDestroyable {
  * @param {MatrixEvent} event The event to use for placeholders.
  */
  public populatePlaceholdersFrom(event: MatrixEvent) {
  - const durationSeconds = Number(event.getContent()['info']?.['duration']);
  - if (Number.isFinite(durationSeconds)) this.placeholderDuration = durationSeconds;
  + const durationMs = Number(event.getContent()['info']?.['duration']);
  + if (Number.isFinite(durationMs)) this.placeholderDuration = durationMs / 1000;
  }
  /**
  