bug when convert from webm to mp4

[elid34]

my code

from moviepy import VideoFileClip

def convert_webm_to_mp4(input_path, output_path=None):
    if output_path is None:
        output_path = input_path.rsplit('.', 1)[0] + '.mp4'

    try:
        clip = VideoFileClip(input_path)
        clip.write_videofile(output_path, codec='libx264', audio_codec='aac')

        print(f"Conversion complete! MP4 saved to: {output_path}")
    except Exception as e:
        print(f"Error during conversion: {e}")


if __name__ == "__main__":
    convert_webm_to_mp4("input_file.webm")

Expected Behavior

convert the file and save it in the output_path

Actual Behavior

print me this error

Error during conversion: Error passing ffmpeg -i command output:

Input #0, matroska,webm, from 'convert_site.webm':
  Metadata:
    encoder         : QTmuxingAppLibWebM-0.0.1
  Duration: N/A, start: 0.000000, bitrate: N/A
  Stream #0:0(eng): Video: vp8, yuv420p(progressive), 1920x1016, SAR 1:1 DAR 240:127, 29.75 fps, 29.75 tbr, 1k tbn (default)
At least one output file must be specified

Steps and code to Reproduce the Problem

ffmpeg -y -i input.webm -movflags faststart -pix_fmt yuv420p -c:v libx264 -preset fast -crf 23 -c:a aac -b:a 192k output.mp4

Specifications

• Python Version: 3.11.2
• MoviePy Version: 2.1.1
• Platform Name: Linux parrot
• Platform Version: 6.12.12-amd64

[keikoro]

The last moviepy release was 2.1.2, and the code in master has already moved on, too – could you please check if you're running into the same issue when using the latest code? Thx.