The filename is truncated to a space

[enmaksimov]

Need to replace: convert_cmd = f"ffmpeg -y -i {video_id}.video -i {video_id}.audio -c copy -bsf:a aac_adtstoasc {video_name}.mp4" To: convert_cmd = f"ffmpeg -y -i {video_id}.video -i {video_id}.audio -c copy -bsf:a aac_adtstoasc \"{video_name}.mp4\""