AV1 to SLN Converter

Extract Asterisk SLN audio from AV1 video online

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Asterisk PBX Audio

SLN is native to Asterisk — converting from AV1 produces IVR prompts and hold music ready for your PBX system.

Telephony Settings

Set 8 kHz or 16 kHz sample rate to match your Asterisk PBX configuration precisely.

Secure Processing

AV1 uploads are erased right after conversion, and SLN outputs are deleted within 24 hours.

How to convert AV1 to SLN

1

Select files from Computer, Google Drive, Dropbox, URL or by dragging it on the page.

2

Choose sln or any other format you need as a result (more than 200 formats supported)

3

Let the file convert and you can download your sln file right afterwards

About formats

AV1 (AOMedia Video 1) is an open, royalty-free video coding format developed by the Alliance for Open Media, a consortium whose founding members include Google, Mozilla, Microsoft, Amazon, Netflix, and Intel, among others. The specification was finalized in June 2018 with the goal of providing a next-generation video codec that surpasses the compression efficiency of H.264 and HEVC while remaining free from licensing fees. AV1 achieves roughly 30-50% better compression than HEVC at equivalent visual quality, making it particularly attractive for streaming platforms seeking to reduce bandwidth costs without sacrificing viewer experience. The codec supports a broad range of features including film grain synthesis, flexible tiling for parallel processing, content-adaptive resolution switching, and a rich set of intra and inter prediction modes. Hardware decoding support has expanded rapidly across mobile processors, GPUs, and smart TVs, addressing early concerns about computational demands during encoding. AV1 has seen wide adoption from major streaming services for delivering 4K and HDR content, and it serves as the video component of the WebM container for web-based playback. The royalty-free status makes AV1 especially important for open web standards and accessible media distribution.
Initial release: June 25, 2018
SLN (Signed Linear) is a headerless raw audio format storing 16-bit signed linear PCM samples at 8000 Hz mono, most closely associated with Asterisk — the open-source PBX framework developed by Digium (now Sangoma Technologies). Within Asterisk, SLN serves as the native internal audio representation: every codec transcoding operation passes through signed linear as an intermediate step. This makes SLN the backbone of Asterisk's codec translation architecture. The format contains nothing but raw samples — no headers, no metadata, no framing — so parameters must be known in advance. While this lack of self-description might seem limiting, it is actually an advantage in telephony where sample format is fixed by convention and every overhead byte matters across thousands of simultaneous channels. The 8000 Hz rate aligns with the G.711 standard for traditional telephony, capturing the full 300-3400 Hz voice band. Asterisk also supports extended variants (sln16, sln32, sln48) for wideband audio. SLN files require no decoding — just direct memory mapping — making them ideal for real-time mixing, conferencing, and prompt playback in high-density VoIP environments.
Initial release: 1999

Frequently Asked Questions

Why convert AV1 to SLN?

SLN is the native audio format for Asterisk PBX systems — used for IVR prompts, hold music, and voicemail greetings.

What uses SLN files?

Asterisk, FreePBX, and compatible VoIP PBX systems use SLN for audio prompts and system sounds.

Is SLN compressed?

No — SLN is raw signed linear PCM. Files are larger but avoid encoding overhead, which simplifies PBX processing.

What sample rate should I use?

Asterisk typically uses 8000 Hz mono for telephony. Some configurations support 16000 Hz for wideband audio.

Are my files secure?

AV1 uploads are deleted immediately. SLN outputs are removed from our servers within 24 hours.