CONVERT
MTS → FLAC
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Fast, secure MTS to FLAC conversion. No registration required.
Setup: MTS is the AVCHD camcorder variant of the MPEG transport stream. Goal: an interchangeable FLAC. Strip a MTS down to just its FLAC audio track for playback on devices that cannot (or should not) show video. This is how most audiobook and podcast workflows start — take a MTS master, emit a FLAC distribution copy, discard the picture track. Background. MTS is the AVCHD camcorder variant of the MPEG transport stream. Destination side, FLAC is the Free Lossless Audio Codec, offering 40–60% compression with zero quality loss.
AVCHD Video
Source formatMTS (AVCHD) is a high-definition video format from Sony and Panasonic camcorders.
FLAC Audio
Target formatFLAC is an open-source lossless audio codec that compresses audio to roughly 50-60% of its original size without any quality loss. It is the preferred format for audiophiles and music archival.
Why convert MTS to FLAC
FLAC is the lingua franca of audio: car stereos, Bluetooth speakers, voice assistants and music apps all expect it. A MTS cannot be uploaded to most of those ecosystems, but the FLAC you extract today will play anywhere tomorrow.
HOW TO CONVERT
MTS → FLAC
Start the job
Upload your MTS; the pipeline auto-detects the audio codec and the best extraction strategy.
Demux to FLAC
FFmpeg pulls the audio track out of the MTS container and writes a clean FLAC.
Save the result
Click download. The video track never leaves our processing container unmodified — we only returned the audio you asked for.
Common Use Cases
Share across platforms
Send FLAC files to anyone without worrying about whether they have the right software for MTS.
Embed in documents
Drop FLAC output into Word, Google Docs, PowerPoint, Notion or a website without conversion warnings.
Optimize size
FLAC often produces smaller files than MTS for web, email and storage.
Archive & future-proof
Store in a widely-supported format that will still open on future operating systems without legacy plugins.
MTS vs FLAC — Strengths and limitations
What each format does best, and where it falls short.
MTS Strengths
- Native format for every AVCHD camcorder since 2006.
- H.264 compression — small files for high-def quality.
- Direct compatibility with iMovie, Premiere, Resolve, Final Cut.
- Carries Dolby Digital 5.1 audio on flagship camcorders.
Limitations
- Slow to decode — editors typically transcode for editing.
- Proprietary folder-structure conventions complicate direct import.
- Largely legacy as smartphones replaced dedicated camcorders.
FLAC Strengths
- Lossless — decoded audio is bit-exact identical to the source.
- 40-60% smaller than uncompressed WAV/AIFF.
- Free, patent-free, open-source reference implementation.
- Built-in error detection via MD5 checksums.
- Streaming-friendly — seek tables let you jump to any timestamp instantly.
Limitations
- File sizes still large compared to lossy codecs (5-10× bigger than AAC for same audio).
- Not suitable for low-bandwidth scenarios like streaming on mobile data.
- Older MP3 players and car stereos may not decode FLAC.
MTS vs FLAC — Technical specifications
Side-by-side comparison of the technical details.
MTS
- MIME type
- video/mp2t
- Extension
- .mts
- Container
- BDAV MPEG-2 Transport Stream (192-byte packets)
- Video codecs
- H.264 (AVCHD Main/High Profile)
- Audio codecs
- AC-3 (Dolby Digital), LPCM
FLAC
- MIME type
- audio/flac
- Extension
- .flac
- Standard
- Open-source reference implementation (Xiph.Org)
- Max bit depth
- 32 bits per sample
- Max sample rate
- 655 350 Hz
- Max channels
- 8
| Specification | MTS | FLAC |
|---|---|---|
| MIME type | video/mp2t | audio/flac |
| Extension | .mts | .flac |
| Container | BDAV MPEG-2 Transport Stream (192-byte packets) | — |
| Video codecs | H.264 (AVCHD Main/High Profile) | — |
| Audio codecs | AC-3 (Dolby Digital), LPCM | — |
| Standard | — | Open-source reference implementation (Xiph.Org) |
| Max bit depth | — | 32 bits per sample |
| Max sample rate | — | 655 350 Hz |
| Max channels | — | 8 |
MTS vs FLAC — Typical file sizes
Approximate file sizes for common scenarios.
MTS
- 1 min HD AVCHD (17 Mbps) ~130 MB
- 1 hour AVCHD Full HD ~8 GB
FLAC
- 3-min song (CD quality) 20-30 MB
- Full album (10 tracks, CD) 250-400 MB
- 3-min song (hi-res 24-bit/96 kHz) 80-120 MB
- Live concert recording (24-bit) 2-10 GB
Quality & Compatibility
Metadata such as track title, artist and chapter markers survive when the MTS carries them in a form the FLAC supports. If the source MTS lacks tagging, the FLAC will be untagged — that is not a conversion bug, it is simply the source data.
Tips for Best Results
- For spoken-word content (podcasts, lectures), 64-96 kbps is indistinguishable from higher rates and saves storage dramatically.
- For music, do not drop the FLAC bitrate below the audio bitrate of the source MTS, otherwise you introduce a second lossy stage.
- Record your extraction settings once and reuse them — consistent bitrate and sample rate across an archive makes downstream tooling happier.
Frequently Asked Questions
Yes. The free tier accepts files up to 25 MB without registration, email capture or watermarks; paid plans go up to 2 GB. Paid plans raise the size cap, enable batch conversions and provide a REST API for automation, but nothing on the free tier is quality-limited — the output is exactly the same as on any paid plan.
Only if the audio codec inside MTS is not directly writable into the FLAC container. When codecs match we stream-copy, producing a bit-exact FLAC. When they differ, we re-encode at a high-quality default, so the perceptual loss is tiny for anything other than lossless-to-lossless mismatches.
Uploads run over HTTPS, files are processed in isolated containers, and both the source MTS and the FLAC output are auto-deleted within two hours. No account is required, file contents are never logged, and KaijuConverter does not use uploads for AI training. The paid plan adds a signable data-processing agreement for regulated workflows.
No. The full MTS lands in our processing container, we demux the audio locally and then the container is destroyed. The video bytes never leave KaijuConverter infrastructure and auto-delete within two hours along with the original file.
Most files finish in well under a minute. Small images and documents are typically ready in a few seconds; large video or audio files scale roughly with duration. Upload speed from your network is usually the dominant factor, not server time.
Yes. The Advanced options let you set start and end times in HH:MM:SS, so you can extract a single chapter, a specific quote or a clean sample instead of the full duration of the MTS.
Related comparisons
See these formats side by side to understand which fits your use case best.
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Read guideSecure & Private Conversion
Your files are encrypted during transfer, processed in isolated containers, and automatically deleted within 60 minutes. We never read, share, or store your data.