Cannot add thumbnail to mp3

[0xFEDERICO]

Checklist

• I'm reporting a broken site support issue
• I've verified that I'm running youtube-dl version 2020.06.16.1
• I've checked that all provided URLs are alive and playable in a browser
• I've checked that all URLs and arguments with special characters are properly quoted or escaped
• I've searched the bugtracker for similar bug reports including closed ones
• I've read bugs section in FAQ

Verbose log on debian with python 3.7

ERROR: Conversion failed! Traceback (most recent call last): File "/home/federico/.local/lib/python3.7/site-packages/youtube_dl/YoutubeDL.py", line 2065, in post_process files_to_delete, info = pp.run(info) File "/home/federico/.local/lib/python3.7/site-packages/youtube_dl/postprocessor/embedthumbnail.py", line 51, in run self.run_ffmpeg_multiple_files([filename, thumbnail_filename], temp_filename, options) File "/home/federico/.local/lib/python3.7/site-packages/youtube_dl/postprocessor/ffmpeg.py", line 235, in run_ffmpeg_multiple_files raise FFmpegPostProcessorError(msg) youtube_dl.postprocessor.ffmpeg.FFmpegPostProcessorError: Conversion failed!

Description

Hi, I have this version /usr/lib/python3.8/site-packages (2020.6.16.1) on my termux installation and when I run this command:
youtube-dl --extract-audio --audio-format mp3 --audio-quality 0 --embed-thumbnail https://youtu.be/WNeLUngb-Xg
I get this error:
ERROR: Conversion failed!
The only thing I noticed is that if I remove --embed-thumbnail I no longer get this error, (obviously I need this option).

[0xFEDERICO]

why?

[0xFEDERICO]

@dstftw

[0xFEDERICO]

This solution doesn't work

[0xFEDERICO]

Now the command is:
youtube-dl -v --extract-audio --audio-format mp3 --audio-quality 0 --restrict-filename --output "%(title)s %(artist)s %(album)s.%(ext)s" --embed-thumbnail https://youtu.be/WNeLUngb-Xg

[daniel-barrows]

This appears to be a duplicate of #25687