MOV to SLN Converter

Extract Asterisk raw signed linear audio from MOV online

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Asterisk Native

SLN is what Asterisk PBX uses internally for audio. Extract audio from MOV and create voice prompts, greetings, and IVR audio for your phone system.

Rate Selection

Choose the sample rate your PBX requires — 8 kHz for narrowband, 16 kHz for wideband. Produce SLN files that integrate with your telephony setup.

No CLI Required

Skip the SoX command line. Convert MOV to SLN directly in your browser and download audio ready for Asterisk without any terminal work.

How to convert MOV 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

MOV is a multimedia container format developed by Apple Inc. and introduced in December 1991 with the launch of the QuickTime multimedia framework. As the native format of QuickTime, MOV pioneered many concepts that later influenced the ISO base media file format (MPEG-4 Part 12) and its derivatives, including MP4. The container uses a hierarchical atom (or box) structure where each atom holds specific types of data — from video and audio tracks to metadata, text, and timecode information. MOV supports an extremely broad range of codecs including H.264, HEVC, ProRes, Apple Intermediate Codec, AAC, and PCM, among many others. This codec flexibility, combined with features like multiple track support, reference movies, and edit lists, has made MOV a staple of professional video production. The ProRes codec from Apple, commonly delivered in MOV containers, is an industry standard for post-production and broadcast finishing. The format handles both compressed delivery-quality content and high-bit-rate production-quality footage with equal capability. Precise timecode and metadata handling make MOV particularly valued in workflows requiring frame-accurate editing and reliable exchange between production tools. MOV is natively supported across all Apple platforms and widely recognized by professional editing software on all operating systems, maintaining its relevance across decades of evolving video technology.
Developer: Apple Inc.
Initial release: December 2, 1991
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 MOV to SLN?

SLN is the native audio format for Asterisk PBX — raw signed linear PCM. Convert MOV audio for direct use as IVR prompts, greetings, and hold music.

What systems use SLN?

Asterisk PBX, FreeSWITCH, and related VoIP platforms use SLN for internal audio processing. SoX can also read and manipulate raw SLN audio data.

Does SLN have a file header?

No — SLN is headerless raw PCM data. Asterisk determines the sample rate from the file extension (sln for 8 kHz, sln16 for 16 kHz, etc.).

What sample rate does Asterisk use?

Standard Asterisk uses 8 kHz for traditional telephony. Wideband setups use 16 kHz for improved voice clarity in VoIP environments.

Is SLN suitable for music?

At 8 kHz, SLN sounds telephony-grade — fine for hold music but noticeably limited. At higher sample rates, quality improves but remains below CD standard.

MOV to SLN Quality Rating

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