MPG to M4A Converter

Extract M4A Audio from an MPG

An MPG file is an MPEG program stream — the Video CD, DVD and TV-capture container whose soundtrack is normally MPEG-1 Audio Layer II (MP2) or Dolby AC-3. This page discards the video, decodes that soundtrack, and re-encodes it as AAC inside an MPEG-4 container written as .m4a: the audio file iPhone, iPad, iTunes, Apple Music and every modern Android and desktop player open natively. It is the fastest way to lift the music, dialogue or commentary off an old disc rip and carry it around without dragging a standard-definition video along with it.

How to Convert MPG to M4A

1. Upload Your MPG File: Drag and drop your .mpg or .mpeg file, or click "Add Files". Several files can be queued and each is processed with the same settings.
2. Pick a Bitrate Mode: Under File Compression, choose Constant Bitrate — the dropdown runs from 8 kbps to 384 kbps and opens on 128 kbps — or Variable Bitrate (a five-rung quality ladder). Custom Bitrate lets you type an exact number, and Specific file size targets a size instead. Quality Preset is the hands-off mode; see the section below for when to reach past it.
3. Set Audio Channel, Sample Rate, or a Trim (Optional): Audio Channel offers Original, Mono or Stereo; Audio Sample Rate offers Original, 8000, 12000, 16000, 24000, 44100 or 48000 Hz. Leave both on Original to match the source. Trim keeps only a start time and duration.
4. Convert and Download: Click Convert and download the .m4a. Files upload over an encrypted connection, are processed on our servers, and are deleted automatically after a few hours — no sign-up, no watermark, never shared.

Which Bitrate Control to Reach For Here

This page exposes five ways to control the encode, and they are not equally predictable. Constant Bitrate is the one to use when you care what comes out — you name a rate and that rate is what the encoder is handed, so the finished file is reproducible and quotable. Custom Bitrate is the same idea with a free-text box, Variable Bitrate targets a quality tier rather than a rate, and Specific file size works backwards from a size budget. Quality Preset is the automatic, hands-off mode and the least predictable control on the page: its dropdown displays "Highest" when the page loads, but nothing is selected in it, so leaving it alone hands the server its own default rather than the label you can see. Pick a named bitrate whenever the output rate matters.

Variable Bitrate is a five-step ladder. The rung labels come from the encoder's own documentation, but our measurements did not match them: the delivered rate barely moved between a mono and a stereo encode at the same rung (149.6 kbps against 150.1 kbps), and the top rung overshot the range printed on it. Treat the five entries as an ordered quality scale — lowest to highest — rather than as bitrate promises, and use Constant Bitrate when you need a number you can rely on.

One more setting is worth a moment: Audio Sample Rate. DVD and Video CD soundtracks are normally 48 kHz, and AAC handles that natively, so leaving the control on Original avoids a resample you gain nothing from. Change it to 44100 Hz only when a downstream tool insists on CD rate, and drop to 16000 or 24000 Hz only for speech where a small file matters more than fidelity — resampling downwards permanently removes the top of the frequency range.

MPG Audio vs the M4A Output

Frequently Asked Questions

Which control on this page actually sets the bitrate?

Constant Bitrate (or Custom Bitrate, if you want a value the dropdown does not list). The Quality Preset dropdown displays "Highest" when the page loads, but nothing is pre-selected there — if you never touch it, the server falls back to its own default rather than the value you can see. The presets are also the least predictable control here, so when the output rate matters, name it explicitly with Constant Bitrate and check the result in your player's file-info panel. Variable Bitrate and Specific file size are the other two ways to steer the encode: the first aims at a quality tier, the second at a size budget.

What bitrate should I choose for the M4A?

Match it to the material and to the source. Speech — interviews, lectures, dialogue from a home video — is clean at 96–128 kbps. Music and anything with wide dynamics benefits from 192–256 kbps. Going much above 256 kbps for AAC buys very little you can hear while the file keeps growing. The one setting that reliably hurts is dropping well below the source rate: an MP2 track that was 224 kbps on the disc re-encoded down to 64 kbps will sound obviously worse.

Will extracting the audio lose quality?

A little, and it is usually inaudible if you do not starve the bitrate. MPG soundtracks are already lossy — MP2 or AC-3 — and AAC is lossy too, so this is a second-generation encode that cannot recover what the first one discarded and adds a small amount of its own loss. Encoding at or near the source rate keeps that second generation transparent for normal listening. If you want to avoid a second lossy pass entirely, MPG to FLAC preserves the decoded audio losslessly instead, at a considerably larger size.

My DVD rip has several soundtracks. Which one ends up in the M4A?

The widest one. This page has no track selector, so the decoder's default rule applies: it takes the audio stream with the most channels, breaking ties by the lowest stream index. On a typical DVD rip that means a 5.1 AC-3 mix wins over the stereo mix even if the stereo track is listed first. Set Audio Channel to Stereo to fold it down in the same conversion. If you specifically need an alternate track — a commentary, or a second language — demux it in a desktop tool before uploading.

Does the M4A keep any of the video?

No. M4A is an audio-only file, so the MPEG video stream is dropped and only the soundtrack is written out. That is why the result is a small fraction of the size of a standard-definition MPG: picture data is the bulk of a video file. Subtitle streams and chapter structure do not survive either. To keep the moving picture, convert to a video target such as MPG to MP4.

What is the difference between the M4A and AAC targets?

The codec is the same; the wrapper is not. M4A puts the AAC audio inside an MPEG-4 container, which is what carries tags, artwork, chapter marks and accurate duration information — the reason music players handle .m4a gracefully. MPG to AAC writes a bare AAC stream instead, which is smaller in overhead and useful for streaming pipelines but has nowhere to store metadata and seeks less precisely. For anything going into a music or podcast library, .m4a is the right choice.

Should I pick M4A or MP3?

M4A generally sounds better than MP3 at the same bitrate and is the native audio format across Apple's ecosystem, so it is the better default. MP3 remains the safer choice for very old hardware — car head units, early portable players, some in-car USB readers — and for handing a file to someone whose setup you cannot predict. MPG to MP3 does the same extraction with the same controls if you need that instead.

Can I extract just one section of the audio?

Yes. The Trim control on this page takes a start time and a duration, either in seconds or as HH:MM:SS.sss, and only that window is encoded — which also finishes faster because the rest of the file is never handed to the encoder. If you prefer to cut afterwards, Audio Cutter accepts .m4a files directly. Audio Cutter will not take the MPG itself, since it only handles audio input; to cut the source video first, use Video Cutter.