fix(migrations): ignore invalid utf8 chars for media files metadata + update transcript parser

check that transcript parser constants are defined before declaring them

app/Entities/Media/BaseMedia.php

@@ -88,7 +88,7 @@ class BaseMedia extends Entity
 
         $this->attributes['type'] = $this->type;
         $this->attributes['file_mimetype'] = $file->getMimeType();
-        $this->attributes['file_metadata'] = json_encode(lstat((string) $file));
+        $this->attributes['file_metadata'] = json_encode(lstat((string) $file), JSON_INVALID_UTF8_IGNORE);
         $this->attributes['file_path'] = save_media(
             $file,
             $this->attributes['file_directory'],

app/Entities/Media/Image.php

@@ -61,7 +61,7 @@ class Image extends BaseMedia
             ];
         }
 
-        $this->attributes['file_metadata'] = json_encode($metadata);
+        $this->attributes['file_metadata'] = json_encode($metadata, JSON_INVALID_UTF8_IGNORE);
 
         $this->initFileProperties();
         $this->saveSizes();

app/Entities/Media/Transcript.php

@@ -58,7 +58,7 @@ class Transcript extends BaseMedia
             $metadata['json_path'] = $jsonFilePath;
         }
 
-        $this->attributes['file_metadata'] = json_encode($metadata);
+        $this->attributes['file_metadata'] = json_encode($metadata, JSON_INVALID_UTF8_IGNORE);
 
         return $this;
     }

app/Libraries/TranscriptParser.php

@@ -30,10 +30,21 @@ class TranscriptParser
      */
     public function parseSrt(): string | false
     {
-        define('SRT_STATE_SUBNUMBER', 0);
-        define('SRT_STATE_TIME', 1);
-        define('SRT_STATE_TEXT', 2);
-        define('SRT_STATE_BLANK', 3);
+        if (! defined('SRT_STATE_SUBNUMBER')) {
+            define('SRT_STATE_SUBNUMBER', 0);
+        }
+
+        if (! defined('SRT_STATE_TIME')) {
+            define('SRT_STATE_TIME', 1);
+        }
+
+        if (! defined('SRT_STATE_TEXT')) {
+            define('SRT_STATE_TEXT', 2);
+        }
+
+        if (! defined('SRT_STATE_BLANK')) {
+            define('SRT_STATE_BLANK', 3);
+        }
 
         $subs = [];
         $state = SRT_STATE_SUBNUMBER;