diff --git a/src/tscut/tools/ffmpeg.py b/src/tscut/tools/ffmpeg.py
index 3b29c88..34645b2 100644
--- a/src/tscut/tools/ffmpeg.py
+++ b/src/tscut/tools/ffmpeg.py
@@ -241,7 +241,7 @@ def extract_all_streams(ffmpeg_path:str, ffprobe_path:str, input_file:IO[bytes],
                 video_codec_params.extend([f'-c:v:{video_id:d}', codec, f'-level:v:{video_id:d}',
                                            level, '-pix_fmt', pixel_format])
                 video_codec_params.extend(interlaced_options)
-                video_codec_params.extend([f'-colorspace:v:{video_id}', color_space,
+                video_codec_params.extend([f'-colorspace:v:{video_id:d}', color_space,
                                          f'-color_primaries:v:{video_id:d}', color_primaries,
                                          f'-color_trc:v:{video_id:d}', color_transfer,
                                          f'-color_range:v:{video_id:d}', color_range])