[SoundCloud] File extension is wrongly detected for SoundCloud's Opus Stream.

[Just-Harry]

Make sure you are using the latest version: run youtube-dl --version and ensure your version is 2018.05.18. If it's not, read this FAQ entry and update. Issues with outdated version will be rejected.

• I've verified and I assure that I'm running youtube-dl 2018.05.18

Before submitting an issue make sure you have:

• At least skimmed through the README, most notably the FAQ and BUGS sections
• Searched the bugtracker for similar issues including closed ones
• Checked that provided video/audio/playlist URLs (if any) are alive and playable in a browser

What is the purpose of your issue?

• 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

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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', '-F', 'https://soundcloud.com/swedemason/paul-mccartney-rabbit-hole']
[debug] Encodings: locale cp1252, fs mbcs, out cp850, pref cp1252
[debug] youtube-dl version 2018.05.18
[debug] Python version 3.4.4 (CPython) - Windows-8.1-6.3.9600
[debug] exe versions: ffmpeg N-91152-g7c333dc6a7, ffprobe N-91152-g7c333dc6a7, phantomjs 2.1.1, rtmpdump 2.4
[debug] Proxy map: {}
[soundcloud] swedemason/paul-mccartney-rabbit-hole: Resolving id
[soundcloud] swedemason/paul-mccartney-rabbit-hole: Downloading info JSON
[soundcloud] 382515878: Downloading track url
[soundcloud] 382515878: Downloading m3u8 information
[soundcloud] 382515878: Downloading m3u8 information
[soundcloud] 382515878: Checking http_mp3_128_url video format URL
[soundcloud] 382515878: Checking hls_opus_64_url video format URL
[soundcloud] 382515878: Checking hls_mp3_128_url video format URL
[info] Available formats for 382515878:
format code       extension  resolution note
hls_opus_64_url   mp3        audio only audio@ 64k
hls_mp3_128_url   mp3        audio only audio@128k
http_mp3_128_url  mp3        audio only audio@128k (best)

[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: ['-v', '--get-filename', '-f', 'hls_opus_64_url', 'https://soundcloud.com/swedemason/paul-mccartney-rabbit-hole']
[debug] Encodings: locale cp1252, fs mbcs, out cp850, pref cp1252
[debug] youtube-dl version 2018.05.18
[debug] Python version 3.4.4 (CPython) - Windows-8.1-6.3.9600
[debug] exe versions: ffmpeg N-91152-g7c333dc6a7, ffprobe N-91152-g7c333dc6a7, phantomjs 2.1.1, rtmpdump 2.4
[debug] Proxy map: {}
Paul McCartney Rabbit Hole-382515878.mp3

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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):

• Single track: https://soundcloud.com/swedemason/paul-mccartney-rabbit-hole

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Description of your issue, suggested solution and other information

SoundCloud has an hls_opus_64_url stream, which uses the Opus codec, youtube-dl wrongly detects the file extension as mp3, and will save the file with a .mp3 file extension, this stops the file from being played in most audio players.

Youtube-dl should detect the file extension as opus or ogg, and save the file accordingly.