Exported mp3 file sampling rate problem

[Hitsounds]

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If the purpose of this issue is a bug report, site support request or you are not completely sure provide the full verbose output as follows:

Add the -v flag to your command line you run youtube-dl with (youtube-dl -v <your command line>), copy the whole output and insert it here. It should look similar to one below (replace it with your log inserted between triple ```):

[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: ['-v', '--no-playlist', '--default-search', 'ytsearch', '--format', 'bestaudio[ext=m4a]', '--extract-audio', '--audio-format', 'mp3', '--add-metadata', '-o', '13471849318416175427.mp3', 'https://www.youtube.com/watch?v=nksfBbEfOD0']
[debug] Encodings: locale UTF-8, fs utf-8, out UTF-8, pref UTF-8
[debug] youtube-dl version 2018.09.08
[debug] Python version 3.6.6 (CPython) - Linux-4.4.0-1027-aws-x86_64-with-debian-stretch-sid
[debug] exe versions: ffmpeg 4.0.2-static, ffprobe 4.0.2-static
[debug] Proxy map: {}
ERROR:     Last message repeated 1 times
 Traceback (most recent call last):
   File "/app/.heroku/python/lib/python3.6/site-packages/youtube_dl/YoutubeDL.py", line 2047, in post_process
     files_to_delete, info = pp.run(info)
   File "/app/.heroku/python/lib/python3.6/site-packages/youtube_dl/postprocessor/ffmpeg.py", line 465, in run
     self.run_ffmpeg_multiple_files(in_filenames, temp_filename, options)
   File "/app/.heroku/python/lib/python3.6/site-packages/youtube_dl/postprocessor/ffmpeg.py", line 204, in run_ffmpeg_multiple_files
     raise FFmpegPostProcessorError(msg)
 youtube_dl.postprocessor.ffmpeg.FFmpegPostProcessorError:     Last message repeated 1 times 
...
<end of log>

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• Single video: https://youtu.be/BaW_jenozKc
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Description of your issue, suggested solution and other information

I have been trying to add bitrate, sample rate and length to the extracted audio files as otherwise the mp3 file does not play well with audacity which seems to think the audio file is only a few seconds long. So I am using the --add-metadata however it throws this error. I am wondering if I am doing something wrong as no matter what I try the mp3 won't work well with audacity or google play music.

[Hitsounds]

Here is an example: https://transfer.sh/4xtVx/13471849318416175427.mp3
It plays fine on the transfer.sh and groove music

however trying to use it with audacity will result in the length being a fraction of a second

and it simply refuses to upload to google play music

.
I'm not sure what i am doing wrong.

[dstftw]

Do not hardcode extension in output template.