M2TS to SLN Converter

Get Asterisk PBX audio from M2TS Blu-ray files online

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Blu-ray to VoIP

Transform M2TS Blu-ray audio into SLN format — perfect for custom hold music, announcements, and greetings on Asterisk PBX systems.

Remote Processing

M2TS files can be large. Our servers extract the audio and encode SLN without burdening your local machine or requiring PBX tools.

Convert Anywhere

Run the M2TS to SLN conversion from any device with a browser. Deploy the resulting audio on your phone system from any location.

How to convert M2TS 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

M2TS (MPEG-2 Transport Stream) is a container format used primarily for multiplexing audio, video, and other data on Blu-ray Disc media. The format is specified as part of the Blu-ray Disc Audio-Video (BDAV) standard developed by the Blu-ray Disc Association, with commercial Blu-ray products launching in 2006. M2TS files wrap content in MPEG-2 transport stream packets with an additional 4-byte timestamp header prepended to each 188-byte packet, resulting in 192-byte packets that enable more precise timing and error recovery during optical disc playback. This extended packet structure helps maintain synchronization when dealing with the variable read speeds inherent to disc-based media. M2TS supports the major Blu-ray video codecs including H.264/AVC, MPEG-2, and VC-1, alongside audio formats such as Dolby TrueHD, DTS-HD Master Audio, and LPCM for lossless surround sound. The container is also used by AVCHD camcorders for recording high-definition footage, making it common in both consumer disc playback and video production workflows. M2TS files preserve chapter markers, subtitle streams, and interactive menu data within the transport stream. Reliable synchronization mechanisms and support for high-quality codecs make M2TS well-suited for archiving high-definition content where preserving full source quality is essential.
Initial release: 2006
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 M2TS to SLN?

SLN is the native raw format for Asterisk PBX. Extracting M2TS audio to SLN lets you create high-quality hold music or prompts from Blu-ray.

What is SLN exactly?

SLN is signed linear 8kHz, 16-bit PCM in little-endian raw format — designed specifically for the Asterisk open-source telephone platform.

Can M2TS surround audio convert?

SLN is mono at 8kHz. Multi-channel M2TS audio is mixed down and resampled to match standard telephony specifications during conversion.

Will audio quality be phone-grade?

SLN at 8kHz provides standard telephony quality. Speech remains clear, though HD music from M2TS will sound noticeably simplified.

Is the process automatic?

Yes — upload M2TS, choose SLN, and download. Audio extraction, downmixing, and encoding all happen automatically on our servers.