Fix one more ttml format

Author: mantas-done

src/Code/Converters/TtmlConverter.php

@@ -326,13 +326,25 @@ private static function subtitleXml2(string $file_content)
 
         $internal_format = [];
 
+        $i = 0;
         foreach ($xml->text as $text) {
             $attributes = $text->attributes();
+            $end = null;
+            if ($attributes['dur'] !== null) {
+                $end = (float) $attributes['start'] + (float) $attributes['dur'];
+            }
             $internal_format[] = array(
-                'start' => (string) $attributes['start'],
-                'end' => (float)((string) $attributes['start'] + (string) $attributes['dur']),
+                'start' => (string)$attributes['start'],
+                'end' => $end,
                 'lines' => self::getLinesFromTextWithBr(str_replace("\n", "<br>", $text->asXML()))
             );
+            if ($i !== 0 && ($internal_format[$i - 1]['end']) === null) {
+                $internal_format[$i - 1]['end'] = (float)$attributes['start'];
+            }
+            $i++;
+        }
+        if ($i !== 0 && $internal_format[$i - 1]['end'] === null) {
+            $internal_format[$i - 1]['end'] = (float)$attributes['start'] + 1;
         }
 
         return $internal_format;

tests/formats/TtmlTest.php

@@ -417,6 +417,20 @@ public function testConvertFromXml7()
         $this->assertInternalFormatsEqual($expected, $actual);
     }
 
+    public function testConvertFromXml7a()
+    {
+        $text = <<<X
+<?xml version="1.0" encoding="utf-8" ?><transcript><text start="0.22">Creating an online shop
+is now easier than ever.</text><text start="3.88">With a minimum investment of time and
+money,</text></transcript>
+X;
+        $actual = Subtitles::loadFromString($text)->getInternalFormat();
+        $expected = (new Subtitles())->add(0.22, 3.88, ['Creating an online shop', 'is now easier than ever.'])
+            ->add(3.88, 4.88, ['With a minimum investment of time and', 'money,'])
+            ->getInternalFormat();
+        $this->assertInternalFormatsEqual($expected, $actual);
+    }
+
     public function testConvertFromXml8()
     {
         $text = <<<X