Trying to download cover art from soundcloud. "ERROR: ffmpeg or avconv not found. Please install one." (Mac OSX)

[ghy213134]

Make sure you are using the latest version: run youtube-dl --version and ensure your version is 2016.08.24.1. If it's not read this FAQ entry and update. Issues with outdated version will be rejected.

• [x ] I've verified and I assure that I'm running youtube-dl 2016.08.24.1

Before submitting an issue make sure you have:

• At least skimmed through README and most notably FAQ and BUGS sections
• Searched the bugtracker for similar issues including closed ones

What is the purpose of your issue?

• [x ] Bug report (encountered problems with youtube-dl)
• Site support request (request for adding support for a new site)
• Feature request (request for a new functionality)
• Question
• Other

$ youtube-dl --embed-thumbnail https://soundcloud.com/ghyppa-142353405/sets/dl-1/s-CNcux
[soundcloud:set] ghyppa-142353405/sets/dl-1/s-CNcux: Resolving id
[soundcloud:set] ghyppa-142353405/sets/dl-1/s-CNcux: Downloading JSON metadata
[download] Downloading playlist: DL
[soundcloud:set] playlist DL: Collected 17 video ids (downloading 17 of them)
[download] Downloading video 1 of 17
[soundcloud] torylanez/diamonds: Resolving id
[soundcloud] torylanez/diamonds: Downloading info JSON
[soundcloud] 278720618: Downloading track url
[soundcloud] 278720618: Checking fallback video format URL
[soundcloud] 278720618: fallback video format URL is invalid, skipping
[soundcloud] 278720618: Checking http_mp3_128_url video format URL
[soundcloud] 278720618: Downloading thumbnail ...
[soundcloud] 278720618: Writing thumbnail to: DIAMONDS (PROD. C-SICK) _ I TOLD YOU - AUGUST 19.-278720618.jpg
[download] Destination: DIAMONDS (PROD. C-SICK) _ I TOLD YOU - AUGUST 19.-278720618.mp3
[download] 100% of 2.73MiB in 00:00
[ffmpeg] Adding thumbnail to "DIAMONDS (PROD. C-SICK) _ I TOLD YOU - AUGUST 19.-278720618.mp3"
ERROR: ffmpeg or avconv not found. Please install one.
...

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### If the purpose of this *issue* is a *site support request* please provide all kinds of example URLs support for which should be included (replace following example URLs by **yours**):

- Playlist: https://soundcloud.com/ghyppa-142353405

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### Description of your *issue*, suggested solution and other information

how do i fix this error?

[dstftw]

ERROR: ffmpeg or avconv not found. Please install one.