Add ass filter support (#185)

Co-authored-by: Harrison Fisher <HarrisonFisher@users.noreply.github.com>

Author: HarrisonFisher

services/v1/ffmpeg/ffmpeg_compose.py

@@ -130,14 +130,24 @@ def process_ffmpeg_compose(data, job_id):
         new_filters = []
         for filter_obj in data["filters"]:
             filter_str = filter_obj["filter"]
-            def replace_subtitles_url(match):
-                url = match.group(1)
+            def replace_url(match):
+                prefix = match.group(1)
+                filter_type = match.group(2)
+                quote = match.group(3)
+                url = match.group(4)
+                closing_quote = match.group(5)
+                trailing = match.group(6) or ''
+                if not url or url.strip() == '':
+                    print(f"[DEBUG] Skipping empty URL for filter: {match.group(0)}")
+                    return match.group(0)
+                print(f"[DEBUG] Parsed URL for filter: {url}")
                 local_path = download_file(url, LOCAL_STORAGE_PATH)
                 subtitles_paths.append(local_path)
                 fixed_path = local_path.replace('\\', '/')
-                return f"subtitles='{fixed_path}"  # keep the opening quote
-            # Regex: subtitles='<url>' or subtitles="<url>"
-            filter_str = re.sub(r"subtitles=['\"]([^'\"]+)", replace_subtitles_url, filter_str)
+                return f"{prefix}{filter_type}={quote}{fixed_path}{closing_quote}{trailing}"
+            # Regex: (.*?)(subtitles|ass)=(['"])(https?://[^'\"]+)(['"])(.*)
+            pattern = r"(.*?)(subtitles|ass)=([\'\"])(https?://[^'\"]+)([\'\"])(.*)"
+            filter_str = re.sub(pattern, replace_url, filter_str)
             new_filters.append(filter_str)
         filter_complex = ";".join(new_filters)
         command.extend(["-filter_complex", filter_complex])