# Transcodings

Published articles for Transcodings.

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## Less Is More: Why Audio on SoundCloud Looks Different

DevFeed: [Less Is More: Why Audio on SoundCloud Looks Different](<https://devfeed.tech/articles/less-is-more-why-audio-on-soundcloud-looks-different-2073.md>)

Original publisher: [Read original article](<https://developers.soundcloud.com/blog//less-is-more-why-soundcloud-low-passes-its-aac-transcodings>)

Published: 2026-06-18T00:00:00Z

Content type: article

Language: en

Sources: [SoundCloud Backstage Blog](<https://devfeed.tech/sources/soundcloud-backstage-blog.md>)

Topics: [Compression](<https://devfeed.tech/topics/compression.md>), [Optimization](<https://devfeed.tech/topics/optimization.md>)

Tags: [audio](<https://devfeed.tech/tags/audio.md>), [compression](<https://devfeed.tech/tags/compression.md>), [engineering](<https://devfeed.tech/tags/engineering.md>), [optimization](<https://devfeed.tech/tags/optimization.md>), [streaming](<https://devfeed.tech/tags/streaming.md>), [transcodings](<https://devfeed.tech/tags/transcodings.md>)

### AI overview

SoundCloud explains why its upgraded AAC encoder applies a low-pass filter around 17 kHz. By discarding frequencies that most listeners barely perceive, the encoder can allocate more bits to audible content and improve overall perceptual quality, even though spectrograms appear to show a loss.

### Source excerpt

Last year, SoundCloud upgraded its AAC encoder for the first time in over a decade. The new one (Fraunhofer's libfdk_aac) delivers higher...

## Moving to Modern Streaming: Introducing AAC HLS on SoundCloud APIs \[Deadline Extended\]

DevFeed: [Moving to Modern Streaming: Introducing AAC HLS on SoundCloud APIs \[Deadline Extended\]](<https://devfeed.tech/articles/moving-to-modern-streaming-introducing-aac-hls-on-soundcloud-apis-deadline-extended-1992.md>)

Original publisher: [Read original article](<https://developers.soundcloud.com/blog//api-streaming-urls>)

Published: 2025-09-15T00:00:00Z

Content type: release

Language: en

Sources: [SoundCloud Backstage Blog](<https://devfeed.tech/sources/soundcloud-backstage-blog.md>)

Topics: [Streaming](<https://devfeed.tech/topics/streaming.md>), [Playback](<https://devfeed.tech/topics/playback.md>), [Transcodings](<https://devfeed.tech/topics/transcodings.md>), [API](<https://devfeed.tech/topics/api.md>), [migration](<https://devfeed.tech/topics/migration.md>), [Availability](<https://devfeed.tech/topics/availability.md>), [HTTP](<https://devfeed.tech/topics/http.md>)

Tags: [announcements](<https://devfeed.tech/tags/announcements.md>), [api](<https://devfeed.tech/tags/api.md>), [apis](<https://devfeed.tech/tags/apis.md>), [audio](<https://devfeed.tech/tags/audio.md>), [availability](<https://devfeed.tech/tags/availability.md>), [github](<https://devfeed.tech/tags/github.md>), [http](<https://devfeed.tech/tags/http.md>), [improvements](<https://devfeed.tech/tags/improvements.md>), [integration](<https://devfeed.tech/tags/integration.md>), [migration](<https://devfeed.tech/tags/migration.md>), [streaming](<https://devfeed.tech/tags/streaming.md>), [transcodings](<https://devfeed.tech/tags/transcodings.md>)

### AI overview

SoundCloud is introducing AAC-based HLS streams through its APIs to improve audio quality, playback consistency, and device support. The new hls_aac_160_url and hls_aac_96_url fields will replace existing MP3 and Opus stream URLs, which are scheduled for removal on December 31, 2025, while preview_mp3_128_url remains available for preview use cases.

### Source excerpt

At SoundCloud, we're always looking for ways to improve the listening experience for our creators, partners, and listeners. One of the...