MPEG to M4B Converter

How to Convert MPEG to M4B Online

1. Upload Your MPEG File: Drag and drop your .mpg or .mpeg file onto the upload zone, or click "+ Add Files" to browse. Batch uploads are supported — extract audio from a whole semester of lecture recordings in one job.
2. Set File Compression: Pick "Quality Preset" (Highest, High, Medium, Low, Lowest) for one-click sizing, "Specific file size" to hit an exact KB/MB target, "Custom Bitrate" for a single value (e.g., 96 kbps), or "Constant Bitrate" / "Variable Bitrate" for studio-grade control. For spoken word, 64–96 kbps is typically transparent; music tracks benefit from 128–192 kbps.
3. Set Audio Channel and Sample Rate: "Audio Channel" defaults to Original — switch to Mono for single-speaker lectures (cuts file size roughly in half) or keep Stereo for music, panels, and ambient detail. "Audio Sample Rate" defaults to Original; 44100 Hz preserves CD quality, 22050 Hz is plenty for voice-only content.
4. Trim and Convert: Use "Trim" to set a start time and duration if you only need part of the recording — useful for pulling one lecture out of a multi-hour seminar capture. Click "Convert" and download your .m4b audiobook. Files are uploaded over an encrypted connection, processed on our servers, and deleted automatically after a few hours — no sign-up, no watermark, never shared.

Why Convert MPEG to M4B?

MPEG (.mpg / .mpeg) files are MPEG-1 or MPEG-2 program/transport streams — the format used for Video CDs, DVDs, broadcast capture, and a lot of older lecture-recording hardware. The audio inside is usually MPEG-1/2 Audio Layer II (MP2). M4B is Apple's audiobook format: AAC audio inside an MPEG-4 Part 14 (ISO/IEC 14496-14) container, with the .m4b extension signaling "audiobook" to players so they unlock chapter navigation and position bookmarking. Converting MPEG to M4B extracts the audio track, re-encodes it to AAC, and packages it for a listen-anywhere experience.

• Lecture recordings into commutable audiobooks — University lecture-capture systems (Echo360, Panopto, older Mediasite installs) frequently export MPEG-1 or MPEG-2. M4B turns a 90-minute video into a phone-friendly audiobook that resumes where you stopped, even after your phone reboots.
• Conference and webinar archives — Talks recorded as MPEG video become M4B audiobooks suitable for Apple Books, Plex, BookPlayer (iOS), or Audiobookshelf. The video signal is dead weight for content you'll only listen to.
• Sermon, lecture, and class libraries for Apple Books — M4B is the only widely-supported format Apple Books recognises as an audiobook (drop the file in and it lands in the audiobook library, not the music library).
• Long-form podcast video → audio archive — Many podcast hosts ship MPEG-2 master files. Encoding to M4B at 64–96 kbps mono keeps a 3-hour episode under 100 MB while keeping speech intelligible.
• DVD audio rips for road trips — Educational DVDs and language-learning sets often arrive as MPEG-2. M4B lets you carry the audio in CarPlay or any iOS device with playback resume across sessions.
• Smaller files than the source video — Stripping the video stream and re-encoding audio to AAC commonly cuts file size by 90% or more, since most of an MPEG file is video data.

MPEG vs M4B — Format Comparison

Audiobook Bitrate & Quality Guide

Frequently Asked Questions

What is M4B and how is it different from M4A or MP3?

M4B and M4A both use the MPEG-4 Part 14 container with AAC audio — the bytes are nearly identical. The .m4b extension is a signal: it tells Apple Books, Plex, Prologue, BookPlayer, and Audiobookshelf to treat the file as an audiobook and enable chapter navigation plus position bookmarking (so playback resumes where you stopped). MP3 is a different codec (MPEG-1 Audio Layer III) without first-class chapter or bookmark support in most ecosystems. At equal bitrate, AAC in an M4B beats MP3 perceptually, especially below 96 kbps.

Will the M4B I create on xConvert have chapter markers?

No. xConvert extracts the audio from your MPEG and re-encodes it to AAC inside an .m4b container, but it does not auto-generate chapter markers. Position bookmarking (resume-where-you-stopped) still works — that's a player feature triggered by the .m4b extension itself, not embedded metadata. If you need explicit chapter breaks, encode here first, then add chapters with a free desktop tool like m4b-tool (open-source, ffmpeg-based) or AudioBook Binder. Both accept a chapters.txt listing timestamps and titles.

What bitrate should I pick for a lecture or sermon?

For a single-speaker recording, 64–96 kbps mono is the sweet spot — it matches Audible's spoken-word range and produces a 30–45 MB file per hour. Going below 48 kbps starts to smear consonants on speech with sharp Ss and Ts. Music or multi-speaker panels deserve 128 kbps stereo or higher. The "Quality Preset: Medium" option is a safe one-click default for spoken content.

Should I pick mono or stereo?

Mono for single-speaker content (lectures, sermons, solo podcasts) — it roughly halves the file size with no audible loss because the source was effectively mono anyway. Stereo for music, multi-speaker discussions where left/right separation helps, or anything with intentional spatial mixing. If your MPEG source is already mono, picking stereo just doubles the file size for no gain.

Why is the M4B much smaller than the original MPEG?

A typical MPEG-1 or MPEG-2 file is 95%+ video data. Removing the video stream alone slashes file size dramatically; re-encoding the remaining audio from MP2 (often 192–384 kbps in DVD masters) down to AAC at 64–96 kbps takes a further large bite. A 1.5 GB DVD-rip lecture commonly lands around 40–60 MB as a mono M4B at 64 kbps.

Will my M4B play on Android, Windows, or Linux — or is it Apple-only?

It plays widely. VLC, foobar2000, and most modern media players handle M4B on every desktop OS. On Android, dedicated audiobook apps such as Smart AudioBook Player and Voice (open-source, GPLv3) treat .m4b as an audiobook and remember position. The richest experience — chapters, sync, library integration — is still in Apple Books, Plex, Prologue (iOS), and Audiobookshelf, but you are not locked to Apple devices.

Can I extract just one section, like a single lecture from a multi-hour recording?

Yes. Expand "Trim" before converting, set a start time (HH:MM:SS) and duration, and only that segment becomes your M4B. You can run multiple jobs on the same upload to produce a separate file per lecture. If you'd rather cut after conversion, see our audio cutter tool.

Is M4B really better than MP3 for audiobooks at the same file size?

Audibly, yes. AAC (the codec inside M4B) was designed as MP3's successor and is more efficient at low bitrates — at 64 kbps AAC is roughly equivalent to MP3 at 96–128 kbps for speech. The bigger practical win is the audiobook ecosystem: chapter navigation, bookmark sync, and proper library placement only work reliably when the file is .m4b. If those features don't matter to you, convert MPEG to MP3 instead — MP3 is more universally compatible.

What other audiobook-friendly conversions does xConvert support?

For audiobook workflows you may also want MP3 to M4B (re-package an existing MP3 as an audiobook), M4A to M4B (rename-style conversion that flips the file into audiobook mode), MP4 to M4B for video lectures in MPEG-4 containers, or compress M4B to shrink a finished audiobook for upload.