DivX to AVCHD Converter

Converting DivX to AVCHD: What to Expect

AVCHD is the camcorder format Sony and Panasonic introduced jointly in 2006 for consumer HD recording: H.264/AVC video and Dolby AC-3 audio multiplexed into an MPEG transport stream. DivX is the opposite kind of thing — an MPEG-4 Part 2 codec from the DVD-rip era, usually standard definition, usually sitting in an AVI. This tutorial covers what happens when you push one into the other, which settings are locked and why, what the file you download actually is, and the point at which this conversion stops being the right answer.

How to Convert DivX to AVCHD

1. Upload Your DivX File: Drag and drop the .divx file onto the page or click to browse for it. Several files can be queued and converted with the same settings; each is uploaded over an encrypted connection.
2. Leave the Codecs Alone: Video Codec is fixed to H.264 and Audio Codec to AC3 — those are the only entries in either list on this page, because they are what the AVCHD specification permits. There is nothing to change and nothing to get wrong.
3. Choose a Resolution and Compression Mode (Optional): Video resolution starts on Keep original; Preset Resolutions offers 720p and 1080p if you genuinely need an HD frame. File Compression starts on Quality Preset at "Very High (Recommended)", with Specific file size, Constant Bitrate, Variable Bitrate, Constant Quality and Constraint Quality as alternatives. Trim takes a Start time and Duration in seconds or as HH:MM:SS.sss.
4. Convert and Download: Click Convert and take the file. No sign-up, no watermark.

Walk-through: What You Actually Get

The download is named with an .avchd extension, and that is worth explaining, because AVCHD is a specification rather than a file type — real AVCHD recordings are named .mts or .m2ts. Inside the file is an MPEG transport stream carrying an H.264 video track and an AC-3 audio track, which is exactly the AVCHD stream format. We checked the output: it probes as mpegts with those two streams.

The practical implication is about file associations, not about the data:

• VLC, mpv, MPC-HC and ffmpeg-based tools identify the stream by inspecting it, so they open the file as-is.
• Camcorder software, Blu-ray authoring tools and most consumer players route on the extension. Rename movie.avchd to movie.mts (or .m2ts) and they will pick it up. No re-conversion is needed — the bytes are already correct.
• If you would rather not rename anything, DivX to MTS writes the same transport stream with the conventional extension already on it. Note that the MTS and M2TS pages default to AAC audio, so if AC-3 is what you need, either switch the Audio Codec there or use this page and rename.

AVCHD at a Glance

The Three Transport-Stream Targets Compared

Common Errors and How to Fix Them

• "Nothing on my computer will open the file." The .avchd extension has no file association anywhere. Rename it to .mts or .m2ts, or open it in VLC, which ignores the extension entirely.
• "My Blu-ray player or camcorder software rejects it." Two usual causes: the extension (rename it) or the fact that a loose stream is not a disc. Authoring software has to write the BDMV/STREAM folder structure before a player will treat it as AVCHD media.
• "The picture looks soft or blocky after I chose 1080p." A standard-definition DivX has no HD detail to recover. Upscaling stretches the pixels it already has. Keep the resolution at or near the source size and spend the bits on quality instead.
• "The file is enormous." A transport stream carries no compression advantage of its own, and the "Very High" preset is generous. Switch File Compression to Constant Bitrate and pick something inside the AVCHD envelope, or use Specific file size.
• "Audio and video drift apart." Old rips sometimes carry irregular frame timing. Setting an explicit resolution preset and a constant bitrate makes the encoder re-time the output cleanly.

Frequently Asked Questions

Why can I not choose AAC or any other audio codec here?

Because AVCHD does not allow it. The specification permits Dolby Digital AC-3 or uncompressed linear PCM and nothing else, so this page offers AC3 alone rather than letting you build a file that calls itself AVCHD and then gets rejected by the first hardware player that reads it. If you want AAC in a transport stream — perfectly reasonable if the destination is a computer or a media server rather than a disc — use the MTS or M2TS page instead, where AAC is the default.

Is the file I download a finished AVCHD disc or card?

No. What you get is the AVCHD video stream. A player-ready AVCHD disc or memory card also needs the BDMV directory structure, the STREAM folder, the clip information and playlist files, and the index metadata — all of which authoring software writes. This file is the correct input to that authoring step, not a substitute for it. Copying it loose onto an SD card will not make a camcorder recognise it.

Will converting DivX to AVCHD make my video high definition?

No. AVCHD is a high-definition format, but it cannot invent detail that was never recorded. Most DivX rips are 480p or 576p; selecting 1080p under Preset Resolutions stretches those pixels across a bigger frame and produces a soft, upscaled image in a much larger file. The output is genuinely HD only if the DivX source was already HD, which is unusual for the format.

What bitrate keeps the file inside the AVCHD envelope?

AVCHD caps at 24 Mbit/s, dropping to 18 Mbit/s for material recorded to DVD media, and the 2011 AVCHD Progressive amendment raised the ceiling to 28 Mbit/s for 1080/50p and 1080/60p. Switch File Compression to Constant Bitrate and stay under whichever of those applies to your target device. For a standard-definition DivX source, anything above about 8 Mbit/s is spending bits on compression artefacts you already have.

What is the difference between .mts and .m2ts?

Nothing in the stream itself — both hold the same AVCHD transport stream. The distinction is purely conventional: camcorders write .mts onto the recording media, and the file is usually renamed to .m2ts once it has been imported to a computer or written into a disc structure. Some software is fussy about which one it will open, which is the only practical reason to care.

Does this conversion re-encode, or does it just repackage the stream?

It re-encodes. Your source is MPEG-4 Part 2 and AVCHD requires H.264, so the video has to be decoded and compressed again — there is no stream copy path, and the audio is likewise re-encoded from MP3 to AC-3. That means one lossy generation is added on top of whatever the original DivX encoder discarded. Keeping the "Very High (Recommended)" preset and the original resolution keeps that generation as invisible as it can be.

Should I convert DivX to AVCHD at all, or go straight to MP4?

Convert to AVCHD only when something in a Blu-ray or camcorder workflow specifically wants an H.264 transport stream with AC-3 audio. For everything else — phones, browsers, smart TVs, editors, media servers — DivX to MP4 is the better conversion. It is the same H.264 video, in a container that every modern device understands, at a smaller size and with no renaming step afterwards.

Can I convert just one section of a long rip?

Yes. Switch Trim from Unchanged to Time Range and enter a Start time and a Duration, either in plain seconds or as HH:MM:SS.sss. Only that window is decoded and re-encoded, so it is also the fastest way to test your resolution and bitrate choices before committing to a two-hour file.

How long are my files kept?

Your file is uploaded over an encrypted connection, converted on our servers, and deleted automatically after a few hours. Files are never shared or made public, no account is required, and the output carries no watermark. Note that no online converter can process a copy-protected commercial disc — the protection has to be removed before the video ever becomes a file.