diff --git a/ci/build.yml b/ci/build.yml
index 80d86c7..61d79b9 100644
--- a/ci/build.yml
+++ b/ci/build.yml
@@ -71,21 +71,21 @@ jobs:
           #   ACTIVATE_VIRTUAL_ENV: 'source .venv/bin/activate'
           #   INSTALL_FFMPEG: 'sudo apt-get install -y ffmpeg'
 
-          # ubuntu2204_gcc12:
-          #   AGENT: 'ubuntu-22.04'
-          #   COMPILER: gcc
-          #   COMPILER_VERSION: 12
-          #   SETUP_BUILD_ENV: 'echo $(COMPILER) $(COMPILER_VERSION)'
-          #   ACTIVATE_VIRTUAL_ENV: 'source .venv/bin/activate'
-          #   INSTALL_FFMPEG: 'sudo apt-get install -y ffmpeg'
+          ubuntu2204_gcc12:
+            AGENT: 'ubuntu-22.04'
+            COMPILER: gcc
+            COMPILER_VERSION: 12
+            SETUP_BUILD_ENV: 'echo $(COMPILER) $(COMPILER_VERSION)'
+            ACTIVATE_VIRTUAL_ENV: 'source .venv/bin/activate'
+            INSTALL_FFMPEG: 'sudo apt-get install -y ffmpeg'
 
-          # ubuntu2204_clang15:
-          #   AGENT: 'ubuntu-22.04'
-          #   COMPILER: clang
-          #   COMPILER_VERSION: 15
-          #   SETUP_BUILD_ENV: 'echo $(COMPILER) $(COMPILER_VERSION)'
-          #   ACTIVATE_VIRTUAL_ENV: 'source .venv/bin/activate'
-          #   INSTALL_FFMPEG: 'sudo apt-get install -y ffmpeg'
+          ubuntu2204_clang15:
+            AGENT: 'ubuntu-22.04'
+            COMPILER: clang
+            COMPILER_VERSION: 15
+            SETUP_BUILD_ENV: 'echo $(COMPILER) $(COMPILER_VERSION)'
+            ACTIVATE_VIRTUAL_ENV: 'source .venv/bin/activate'
+            INSTALL_FFMPEG: 'sudo apt-get install -y ffmpeg'
 
           macos14_clang15:
             AGENT: 'macOS-14'
diff --git a/scripts/tests/generate_test_data.py b/scripts/tests/generate_test_data.py
index c306c30..e304101 100644
--- a/scripts/tests/generate_test_data.py
+++ b/scripts/tests/generate_test_data.py
@@ -24,6 +24,12 @@
 APPLICATION_NAME = "Test data generator"
 
 
+def parse():
+    parser = argparse.ArgumentParser(APPLICATION_NAME, formatter_class=argparse.ArgumentDefaultsHelpFormatter)
+    parser.add_argument("--directory", help="Directory where output files will be generated", required=False, default=pathlib.Path("data"))
+    parser.add_argument("--executable", help='Path to the ffmpeg executable', required=False, default='ffmpeg')
+    return parser.parse_args()
+
 def ffmpeg_generate_video_commands(ffmpeg_executable, output_dir, video_formats):
     commands = []
     for format in video_formats:
@@ -48,12 +54,6 @@ def ffmpeg_generate_video_commands(ffmpeg_executable, output_dir, video_formats)
 
     return commands
 
-def parse():
-    parser = argparse.ArgumentParser(APPLICATION_NAME, formatter_class=argparse.ArgumentDefaultsHelpFormatter)
-    parser.add_argument("--directory", help="Directory where output files will be generated", required=False, default=pathlib.Path("data"))
-    parser.add_argument("--executable", help='Path to the ffmpeg executable', required=False, default='ffmpeg')
-    return parser.parse_args()
-
 def create_file(cmd):
     print(cmd)
 
@@ -88,13 +88,14 @@ def main():
 
     check_executable(executable)
 
-    with concurrent.futures.ThreadPoolExecutor(max_workers=sys.maxsize) as executor:
+    with concurrent.futures.ThreadPoolExecutor(max_workers=4) as executor:
         commands = ffmpeg_generate_video_commands(executable, output_dir, video_formats)
         futures = {executor.submit(create_file, cmd): cmd for cmd in commands}
         for future in concurrent.futures.as_completed(futures):
             if future.result() != 0:
                 print(f"Error running {APPLICATION_NAME} - Execution finished")
                 return future.result()
+
     print(f"{APPLICATION_NAME} - Execution finished")
     return 0