Out of the box, if you add a remote audio item from Soundcloud, the iframe showing it is 100px wide.
This isn't exactly a bug, because everything works as expected, but it looks odd, and it is may not be immediately obvious how to fix it.
This can be addressed by the following steps:
1. go to /admin/structure/media/manage/remote_audio/display
2. click the cog to edit the oEmbed settings
3. select a maximum width e.g. 800px
Strangely, the Spotify iframe looks fine -
1. enable the module
2. add a Soundcloud item, e.g. https://soundcloud.com/dj-jo-public/jo-public-logical-obsession-09-dec-2...
tbc - possibly just documentation?
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It's likely this issue predates Contrib.social: some issue and comment data are missing.
@malcomio, this should be able to be solved by either:
1) having the module expose a config option for minimum SoundCloud embed width, and then apply that width to SoundCloud embeds only
OR
2) having the module always set the max_width option on displays for remote_audio, which is the easier of the two fixes, and would work just as well.
I'm not sure when a fix can get in a stable release so in the meantime your suggested workaround is best.