TS to M4B Converter

How to Convert TS to M4B Online

1. Upload Your TS File: Drag and drop or click "Add Files" to select MPEG-TS (.ts) files. DVR captures, camcorder transport streams, HLS segment dumps, and Blu-ray rips all work. Batch is supported — convert a whole DVR series in one pass.
2. Pick Quality Preset or Bitrate: Default is Quality Preset → Very High (AAC ~160-192 kbps stereo). For spoken-word audiobooks, switch File Compression to Constant Bitrate and pick 64-96 kbps mono — that's the sweet spot for narration and keeps a 10-hour book under 500 MB. For music-heavy content (lectures with samples, podcasts with intro stings) stay at 128-192 kbps stereo.
3. Set Sample Rate, Channels, and Trim (Optional): Match the source rate (commonly 48 kHz for broadcast TS) or downsample to 22 kHz for pure speech to shrink the file further. Set Audio Channel to mono for narration, stereo for music. Trim using start time + duration in HH:MM:SS.sss to cut commercials or pull a single episode out of a long capture.
4. Convert and Download: Click Convert. TS gets demuxed, the audio elementary stream is transcoded to AAC, and it's repackaged inside an M4B container. Files download individually or as a ZIP — no sign-up, no watermark.

Why Convert TS to M4B?

TS (MPEG Transport Stream) is the container used for digital broadcast, IPTV, HLS streaming, and many DVR / camcorder recordings. It carries H.264 or H.265 video alongside AAC, AC3, or MP2 audio in a packetized format designed to survive transmission errors. Great for delivery; awful for a phone audio library. M4B is Apple's MPEG-4 audiobook container — same AAC audio inside, but with a metadata profile that flags the file as an audiobook so iOS, macOS, and dedicated audiobook apps treat it correctly (chapter list, resume-where-you-left-off, sleep timer, variable speed). Common reasons to convert TS → M4B:

• Audiobook-grade resume behavior — When you close Apple Books or BookPlayer halfway through an M4B, it remembers the exact position. The same MP3 in the Music app does not — close the app and you start over. Resume + sleep timer is the whole reason M4B exists.
• Ripping a long DVR lecture series into one navigable file — University lecture captures, sermon series, and recorded talks often arrive as a folder of TS files. Convert them to M4B, merge, and you get a single audiobook with each lecture as a chapter rather than a scattered playlist of MP3s.
• Apple Books library integration — Drop an M4B into the Books app on iPhone / iPad / Mac and it shows up as an audiobook automatically — separate from your music, with a bookcase UI and "Continue Listening" surfacing in CarPlay.
• Stripping huge video for audio-only listening — A 90-minute HD TS recording is typically 2-5 GB. The audio at 96 kbps mono M4B is ~65 MB. 30-60× smaller for the only part you actually wanted.
• Long-form podcast and conference talk archives — Conference recordings and panel discussions often come as TS captures. M4B at 96 kbps mono fits a 12-hour conference into ~500 MB with chapter-style navigation.
• AAC efficiency over MP3 — AAC at the same bitrate sounds better than MP3, especially for voice at low bitrates. At 64 kbps mono AAC sounds like 96 kbps mono MP3 — meaningful savings on a 20-hour audiobook.

TS vs M4B — Format Comparison

AAC Bitrate Choice for Audiobooks

Frequently Asked Questions

Will the video portion of my TS file get thrown away?

Yes — M4B is an audio-only container, so the H.264/H.265 video stream from the TS gets dropped during conversion and only the audio elementary stream is kept. The audio is transcoded from its source codec (typically AAC, sometimes AC3 or MP2 in older DVR captures) to AAC and packaged inside the M4B container. If you want to keep the video too, use TS to MP4 instead. If you just need to trim a long M4B down to a clip after conversion, Audio Cutter accepts M4B input directly.

Why M4B instead of MP3 or M4A?

M4B and M4A use the exact same AAC audio codec — the only difference is the file flag and metadata profile. iOS, macOS, and Apple Books look at the M4B flag and treat the file as an audiobook: it goes in the Books library (not Music), it gets variable-speed playback (1.5×, 2×), it remembers your position even after months away, and it surfaces in CarPlay's audiobook section. An identical M4A file becomes "background music" and behaves badly. MP3 has no chapter or resume support at all.

Can I add chapter markers during conversion?

Not yet during conversion itself — xconvert produces a single-segment M4B with the file as one chapter. To add chapter markers, convert to M4B here, then open the file in a free desktop tool like Audiobook Builder (Mac) or mp4chaps from the mp4v2 package to embed chapter timestamps and titles. If your source TS is actually multiple segments you want as chapters, convert each to M4B and merge them with an audiobook-aware tool — they preserve segment boundaries as chapters.

Will Apple Books actually pick up the M4B as an audiobook?

Yes on macOS and iPadOS — drop the M4B into the Books app or sync from Finder and it lands in the Audiobooks tab with cover art and resume support. iPhone is trickier in 2025/2026: Apple removed direct sideloading from the Books app for some setups, so you may need to add the file to Books on Mac first, then iCloud-sync to iPhone, or use a third-party reader like BookPlayer that accepts files directly via Files / AirDrop.

What audio bitrate should I pick for a spoken-word audiobook?

64 kbps mono AAC is the sweet spot for narration. It sounds clean for voice, keeps a 10-hour book around 280 MB, and matches what commercial audiobook services like Audible historically used for standard quality. Drop to 32 kbps mono if storage is extremely tight (older iPhones, smartwatches) — it's audible but tolerable for talk content. Stay stereo at 96-128 kbps only if the recording has significant music or environmental sound you care about.

My TS file is 4 GB — will the M4B fit in iCloud free tier?

Almost certainly. Most 4 GB TS captures are 1-2 hours of HD video + audio. As 64 kbps mono M4B, 2 hours of audio is ~55 MB — well inside iCloud's free 5 GB tier and trivial for Drive's 15 GB. The size reduction comes from dropping video, not from compressing audio.

Why does my converted M4B play but not show as an audiobook?

Two common causes. (1) Your player ignores the .m4b extension and treats it as music — Apple Music app on iOS does this; switch to Apple Books or a dedicated audiobook reader. (2) The file's internal ftyp brand was set to M4A_ instead of M4B_. xconvert sets M4B_ correctly, but if you renamed an M4A to .m4b after the fact, Books won't recognize it. Reconvert through xconvert to fix.

Can I convert other audio sources to M4B too?

Yes — see MP3 to M4B for the most common audiobook-prep flow (folder of MP3 chapters → single audiobook), or the reverse direction M4B to MP3 if you need to export an audiobook to a player that doesn't understand M4B. TS is just one of dozens of supported input formats — the M4B output behavior is identical regardless of source.