Error when I put url on input() ?

Hello, I have some trouble when I use URL as a value in input function, I got this error, what I’m missing in here?

I would like to try to implement this original commend on FFmpeg ffmpeg -i "http://example.com/video_url.m3u8" -c copy -bsf:a aac_adtstoasc "output.mp4"

are ‘input.(source)’ is equal as ‘ffmpeg -i source’ ? but yeah when I try with this code:

dofirst = ffmpeg.output(dofirst, "master.mp4", **{'-bsf:a': 'aac_adtstoasc'})
ffmpeg.run(dofirst)

I get this stuff:

  File "d:/Workspaces/Python/ytcd/ffmpegd.py", line 10, in <module>
    ffmpeg.run(dofirst)
  File "C:\Program Files\Python37\lib\site-packages\ffmpeg\_run.py", line 208, in run
    p = subprocess.Popen(args, stdin=stdin_stream, stdout=stdout_stream, stderr=stderr_stream)
  File "C:\Program Files\Python37\lib\subprocess.py", line 756, in __init__
    restore_signals, start_new_session)
  File "C:\Program Files\Python37\lib\subprocess.py", line 1155, in _execute_child
    startupinfo)
FileNotFoundError: [WinError 2] The system cannot find the file specified

[sailordiary]

Use absf='aac_adtstoasc'.

[bilabar]

Your code should have no dash in bsf parameter

dofirst = ffmpeg.output(dofirst, "master.mp4", **{'bsf:a': 'aac_adtstoasc'})

Look at #136

ffmpeg.input(new_filename).output(h264_stream, vcodec='copy', **{'bsf:v': h264_mp4toannexb'}).compile()