🎵SoundCloud Upgrades AAC Encoder for First Time in Decade
Better audio quality at lower bitrates? Yes please.
TL;DR
SoundCloud upgraded its AAC encoder, delivering better audio quality. The new Fraunhofer libfdk_aac cuts less in high frequencies and optimizes mid-range clarity at 256 kbps.
SoundCloud just swapped out its AAC encoder for the first time in over a decade, using Fraunhofer's libfdk_aac. This upgrade means higher perceptual audio quality across every metric tracked. For developers working with compressed audio files, this is a big deal as it allows clearer sound at lower bitrates. At 256 kbps, the new encoder applies a gentle rolloff around 17 kHz, reducing error rates in mid-range frequencies where human ears are most sensitive. Fraunhofer validated these cutoff points over decades with extensive listening tests.
Key Points
Fraunhofer's libfdk_aac delivers higher perceptual audio quality across every metric tracked
The new encoder cuts less in high frequencies, optimizing mid-range clarity at 256 kbps
At 256 kbps, the encoder applies a gentle rolloff around 17 kHz to reduce error rates
Fraunhofer validated these cutoff points with extensive listening tests over decades
Trained listeners couldn't reliably tell the difference between original and encoded audio
Why It Matters
If you're working on an app that relies on compressed audio files, this upgrade means clearer sound at lower bitrates. For example, a music streaming service using SoundCloud's API now benefits from improved mid-range clarity without sacrificing file size.
Frequently Asked Questions
Why does this matter?
If you're working on an app that relies on compressed audio files, this upgrade means clearer sound at lower bitrates. For example, a music streaming service using SoundCloud's API now benefits from improved mid-range clarity without sacrificing file size.
What happened?
SoundCloud upgraded its AAC encoder, delivering better audio quality. The new Fraunhofer libfdk_aac cuts less in high frequencies and optimizes mid-range clarity at 256 kbps.
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