Convert MPEG to MKV
Move an MPEG into an MKV container without re-encoding anything. The video and audio are copied straight across, so the picture is bit-for-bit what it was and the conversion finishes in seconds. For anything ripped from a disc this is the right first move: it preserves the original exactly while putting it somewhere that can hold subtitles and several audio tracks.
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What it does
- Streams copied, not re-encoded — identical quality
- Preserves an MPEG-2 disc rip exactly
- MKV carries subtitles and extra audio tracks
- No watermark and no sign-up
How to use MPEG to MKV
- 1
Add the MPEG
Drop the file in or choose it from your computer. Disc rips are large, so trim first if you only want part.
- 2
Convert
The streams are copied into an MKV with `-c copy`. Nothing is decoded and nothing is encoded.
- 3
Use it
The MKV plays in VLC, MPV and every media server, and will now take subtitle and audio tracks.
Why a remux is the right move for a disc rip
MPEG-2 video from a DVD is not a copy of something better — it is what was pressed onto the disc. There is no higher-quality version to go back to, and every time it is re-encoded, that generation is permanent.
So the sensible thing to do with one is to change as little as possible. Remuxing changes the container and nothing else: the video and audio streams are copied across byte for byte, which was verified by comparing the stream checksum before and after.
Keep that as the master, and make an MP4 from it whenever a phone or a browser needs one. The MP4 is disposable; the rip is not.
How it works
The streams are copied into an MKV container with -c copy. No frame is decoded
and no encoder runs, so the time taken is bounded by reading and writing the file
rather than by how long the video is.
The result is very slightly smaller, because MPEG program streams carry padding and repeated timing information that Matroska does not need.
What the container gains you
MPEG program streams were designed in the early nineties for a specific job and have almost nothing beyond video and audio. No subtitle tracks worth the name, no chapter markers, no metadata, no clean way to carry a second audio language.
MKV has all of it, which matters for exactly the kind of file this conversion handles — a film or a recording that somebody wants to keep, caption, and find again in a library.
What this does not solve
Playback anywhere modern. MPEG-2 is a 1994 codec and phones, browsers and smart televisions do not decode it; putting it in a different container does not change that. VLC, MPV and media servers will play the result happily, and a phone will not.
For that, convert to MP4 — and do it from the remuxed master rather than instead of making one.
Trim before uploading a disc rip
A full DVD rip is several gigabytes against a 50 MB upload limit here, so cutting the part you want first is not optional for most of these files.
Do it losslessly. ffmpeg will split an MPEG by timecode with -c copy in
seconds, and VLC can record a section during playback. A lossless cut followed by
a lossless remux means the footage reaching the MKV has still never been through
an encoder — which is the whole reason to take this route rather than converting
straight to MP4.
Examples
A DVD rip going into a library
MPEG-2 from a disc is the original data. Remuxing keeps it exactly and gives it a container a media server can index.
An old recording that needs subtitles
MPEG has no useful subtitle support. MKV holds them as selectable text, so captions can be added without re-encoding the video.
Frequently asked questions
Does the video get better?
No, and that is the point. The MPEG-2 video is copied unchanged, artifacts and all — this preserves the file rather than improving it. If you want something a phone or a browser will play, convert to MP4 instead, which re-encodes to H.264 and costs a little quality to gain a great deal of compatibility.
Why remux rather than convert an old disc rip?
Because MPEG-2 from a disc is as close to the original as you will get, and every re- encode is permanent. Keeping the master as a lossless remux and generating MP4 copies from it when a device needs one is the arrangement that leaves your options open. Re- encoding the only copy you have closes them.
Will the file be smaller?
Slightly, and only because MPEG program streams carry padding that Matroska does not need. The video data is identical, so a large size difference would mean something was re-encoded — which is not what this does.
What about the subtitles already on the disc?
Those are usually VOBSUB, which is a picture of text rather than text, and they live outside the video stream. This conversion carries the video and audio; subtitle handling for disc rips is a job for a desktop tool such as MKVToolNix, which can pull them in as a proper track.