Initializing... drag & drop files here
Supports: MTS
People convert .mts to .mpg for one of two very different reasons, and the right settings depend entirely on which one you are. Either something old and specific demands it — a DVD authoring package, a set-top recorder, a kiosk or signage player, a school or council system whose upload form lists MPG and nothing else — or the file simply refuses to open and MPG was the first familiar extension that came to mind. If you are in the second group, stop here: MTS to MP4 is smaller, sharper, and plays on everything you own.
If you are in the first group, this page does the job properly. MPG is the MPEG program stream, carrying MPEG-1 or MPEG-2 video — MPEG-2 video was standardised jointly as ITU-T H.262 and ISO/IEC in 1995, three decades of installed hardware ago. Your source is the opposite end of that history: AVCHD, which the format specification defines as H.264 video with Dolby Digital or Linear PCM audio in a transport stream, at up to 24 Mbps. Going from one to the other is a deliberate downgrade in codec efficiency that buys you compatibility.
| Property | MTS (AVCHD source) | MPG (MPEG-2 output) | MP4 |
|---|---|---|---|
| Stream type | MPEG-2 transport stream, built for broadcast and disc | MPEG program stream, built for local playback | ISO base media file |
| Video codec | H.264/AVC | MPEG-2 (or MPEG-1) | H.264/AVC |
| Audio options here | AC-3 or Linear PCM as recorded | MP2, AC3, MP3, DTS (DCA) | AAC or AC3 |
| Codec generation | 2000s | 1990s | 2000s |
| Bits needed for the same picture | Baseline | Substantially more | Baseline |
| Plays in a current browser | No | No | Yes |
| Plays on phones and smart TVs | Rarely | Rarely | Yes |
| Accepted as DVD-Video video without transcoding | No | Yes, at standard-definition frame sizes | No |
| Opens in pre-2005 editing software | No | Usually | No |
| Sensible verdict | Keep as the master | Only when something old demands it | The default answer |
.mts extension only — if your copy is named .m2ts, rename it or use M2TS to MPG instead, since the two spellings usually hold the identical stream..mpg. Your file is uploaded over an encrypted connection, processed on our servers, and deleted automatically a few hours later — no sign-up, no watermark, never shared or made public.| Aspect | MPEG-1 | MPEG-2 (opens selected) |
|---|---|---|
| Era | The first MPEG video standard, early 1990s | ITU-T H.262 / ISO-IEC, 1995 |
| Designed for | Progressive video at Video CD rates | Broadcast, DVD, and HDV, including interlaced material |
| Interlaced coding tools | None — the interlaced tools arrived with MPEG-2 | Yes |
| DVD authoring | Not accepted as DVD-Video | The required codec |
| Efficiency | Lower again than MPEG-2 | Low by modern standards, but the better of the two |
| The Constant Quality box | Works — it is applied as a 1-31 quantiser where lower is better | Discarded; the value never reaches the encoder |
| Pick it when | Something explicitly asks for MPEG-1 or Video CD | Every other case |
That last row is the practical difference most people hit. With MPEG-2 selected, the Constant Quality and Constraint Quality modes render a numeric field but the number is dropped and replaced by a bitrate derived from your output frame size, so those two modes cannot be used to steer quality. With MPEG-1 selected, the same field is applied as a quantiser — but it does not open at a value that suits a 1-31 scale, so set it deliberately: roughly 2 to 5 is high quality, and the picture degrades quickly above about 10.
Yes — same format, same bytes, different extension length. The three-letter form dates from the era when Windows filenames were limited to a three-character extension, and both names have been used interchangeably for MPEG program streams ever since. Renaming an .mpg to .mpeg or back changes nothing about the file. If your destination insists on the longer spelling, MTS to MPEG is this same conversion with that extension on the output.
MPEG-2, unless something has named MPEG-1 specifically. MPEG-2 is more efficient, it is the codec DVD-Video requires, and it has the interlaced coding tools that camcorder footage frequently needs — MPEG-1 was designed for progressive video and predates all of that. The realistic reasons to choose MPEG-1 are Video CD authoring and a small number of very old players and capture systems that never learned MPEG-2. There is one quirk worth knowing in the other direction: the Constant Quality control actually functions with MPEG-1 selected, whereas MPEG-2 discards it.
Most set-top DVD players have no file playback at all — they read a disc structure, not loose files on a stick. TVs with USB media playback are the more likely target, and MPEG-2 in a program stream is one of the formats they most often support, so the odds are good. Two things break it in practice: a full-HD frame size on a player expecting standard definition, and an audio track it cannot decode. If a TV rejects the file, re-run at 720x480 or 720x576 with MP2 audio before assuming the format is wrong.
No, and this is the single most common disappointment with this conversion. No current browser decodes MPEG-2 in a program stream, and phones do not play .mpg without a third-party player app. MPG is a compatibility format for old hardware and old software, not for modern devices. If your goal is footage you can text, email, or embed on a page, convert to MTS to MP4 — or MTS to WebM if you need a royalty-free codec for the web.
It can stay full HD. MPEG-2 handles high definition perfectly well — it is the codec HDV camcorders recorded and the one Blu-ray still permits — so leaving Video resolution on Keep original produces a 1920x1080 MPEG-2 program stream. Standard definition is only mandatory when DVD-Video authoring is the destination, because the disc format itself is standard definition. The trade-off for keeping HD is size: the encoder enforces a minimum bitrate that scales with frame area, so a 1080p MPEG-2 file is a large file by design.
Work from the frame size. At 720x480 or 720x576 the encoder will not go below 2 Mbps, and roughly 4 to 6 Mbps is where standard-definition MPEG-2 stops looking soft on real footage. At 1920x1080 the enforced minimum rises to about 7.5 Mbps, and you generally want 12 to 20 Mbps before HD MPEG-2 looks comparable to the AVCHD source it came from — which is not unreasonable, given AVCHD itself records at up to 24 Mbps. Enter those in Constant Bitrate for a predictable rate, or Variable Bitrate if you want the encoder to spend more on busy scenes.
Two separate barriers. The first is the container: .mts is an MPEG-2 transport stream, a format designed to be broadcast or streamed, with error-resilience framing that older desktop software was never written to demultiplex. The second is the codec: H.264 arrived after a lot of that software shipped, so even if it parsed the container it could not decode the picture. An MPG solves both at once — a program stream is the layout desktop software of that era expects, and MPEG-2 is the codec it was built around.
No. Your upload travels over an encrypted connection, is processed on our servers, and is deleted automatically a few hours after the job finishes; the converted MPG goes the same way. Files are never shared or made public, there is no sign-up, and nothing is watermarked. There is no fixed per-file cap either — what limits you is upload size and connection speed, and AVCHD at up to 24 Mbps adds up fast, so trimming the section you need with Video Cutter before uploading is often the quickest route to a finished file.