CAF to MTS Converter

CAF to MTS Converter

CAF (Core Audio Format) is Apple's audio container; MTS is the camcorder file of the AVCHD video format. So this is not a normal media conversion — a .caf holds only sound and has no picture frames to put on screen. What this tool actually does is wrap your CAF audio into an MTS video stream: the audio becomes an AC3 or AAC track inside an MPEG transport stream, and the picture is a single solid-color canvas (black by default). The result is a real, playable .mts video whose screen is blank but whose soundtrack is your recording. The reason to do this is narrow but real: some camcorder-oriented tools, NLE timelines, and upload forms accept only AVCHD/MTS video and reject a bare audio file — this gives that pipeline a valid video container to swallow.

CAF Format at a Glance

MTS / AVCHD Format at a Glance

How to Convert CAF to MTS

1. Upload Your CAF File: Drag and drop your .caf onto the page or click "+ Add Files" to browse. Logic Pro bounces, GarageBand exports, and iOS field recordings are all accepted, and you can queue several files to convert in one batch.
2. Pick Quality Preset or a Bitrate Mode: Under File Compression the default is Quality Preset → Very High (Recommended). Switch to Specific file size, Constant Bitrate, Variable Bitrate, Constant Quality, or Constraint Quality if your destination needs a fixed size or a precise rate.
3. Set Video Resolution (Optional): Because the source is audio, the MTS gets a default canvas. Use Video resolution to keep the original, choose a Preset Resolution, set a Resolution Percentage, or enter a custom Width x Height for the blank frame — and use Trim → Time Range to clip a section.
4. Convert and Download: Click "Convert" and download your MTS. No sign-up, no watermark.

Files are uploaded over an encrypted connection, processed on our servers, and deleted automatically a few hours after conversion — never shared or made public.

Frequently Asked Questions

Will the MTS file show any picture?

No real picture. CAF carries only audio, so the MTS gets a single solid-color frame — black by default — for its entire length, and your recording plays as the soundtrack. The video track exists only so the file is a valid AVCHD-style container; there is no source imagery to display. If you do not actually need a video wrapper, an audio target like CAF to AAC or CAF to MP3 is smaller and simpler.

Why would anyone convert audio to MTS instead of keeping it as audio?

The honest answer is compatibility, not quality. Some camcorder-oriented editors, AVCHD disc tools, and upload forms accept only video containers and reject a bare .caf or .mp3. Wrapping the audio in an MTS gives those pipelines a file they will ingest. For everyday playback or sharing, you almost always want a real audio format instead — see the audio converter for every audio output.

What codecs does the output MTS use?

The video track is H.264 / MPEG-4 AVC, which is what the AVCHD specification requires. For audio, xconvert defaults to AAC and also offers AC3 (Dolby Digital) under the Audio Codec option — AC3 is the codec native AVCHD camcorders record, so pick it if a strict AVCHD tool is fussy about the audio stream.

Is the MTS the same as an M2TS file?

They are the same AVCHD payload with different extensions by convention: camcorders write .mts to the SD card, and the file is commonly renamed .m2ts once it is imported into a computer or an AVCHD disc structure. If your target tool specifically wants .m2ts, use CAF to M2TS instead; the bytes are otherwise equivalent.

Will I lose quality, and does the blank video bloat the file?

The audio is re-encoded to AAC or AC3, so if the CAF held uncompressed PCM or ALAC there is a small lossy step — set a higher bitrate (256 kbps and up) to keep it inaudible. The solid-color video adds very little: a static single-color frame compresses to almost nothing under H.264, so the file size is driven mainly by the audio bitrate and length, not the picture.

Should I use CAF to MTS or CAF to MP4 for getting audio into a video editor?

For most video editors, CAF to MP4 or CAF to MOV is the easier handoff — MP4 and MOV are accepted far more widely than raw MTS. Reserve CAF to MTS for the specific case where a tool or device demands an AVCHD/MTS file. In our testing, a short Linear-PCM .caf voice clip wrapped to MTS at AAC 256 kbps produced a small file that imported into AVCHD-aware tools without complaint, while the on-screen image stayed a flat black frame throughout.

How long are my files kept after conversion?

They are not kept. Uploads travel over an encrypted connection, are processed on our servers, and are deleted automatically a few hours after conversion. There is no sign-up and no watermark, and your files are never shared or made public.