change MP4 encoding crf from 18 to 15

wangzhibo

2025-08-04 f5106b912f1261fe633aa6bcdf10a4b7e74345aa

 auto_media_publisher/generators/video_generator_concat.py

@@ -304,7 +304,7 @@
            else:
                cmd += ["-filter_complex", "; ".join(filters), "-map", "[vout]"]

            cmd += ["-shortest", "-c:v", "libx264", "-crf", "18", "-preset", "veryfast", "-c:a", "aac", output_path]
            cmd += ["-shortest", "-c:v", "libx264", "-crf", "15", "-preset", "veryfast", "-c:a", "aac", output_path]
            # CPU: libx264
            # Nivida GPU : h264_nvenc 或 hevc_nvenc
            # AMD GPU: h264_amf 或 hevc_amf