{"id":970,"date":"2026-07-14T15:13:00","date_gmt":"2026-07-14T19:13:00","guid":{"rendered":"https:\/\/www.xconvert.com\/blog\/?p=970"},"modified":"2026-06-27T03:00:33","modified_gmt":"2026-06-27T07:00:33","slug":"convert-mts-m2ts-avchd-to-mp4","status":"publish","type":"post","link":"https:\/\/www.xconvert.com\/blog\/convert-mts-m2ts-avchd-to-mp4","title":{"rendered":"Convert MTS\/M2TS (AVCHD Camcorder) to MP4 \u2014 No Quality Loss"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">You copied the holiday footage off your Sony or Panasonic camcorder, double-clicked the <code>.MTS<\/code> file \u2014 and nothing happened. Maybe your phone refused it, your editor wouldn\u2019t import it, or the audio went silent. That\u2019s not a corrupt file: <code>.MTS<\/code> and <code>.M2TS<\/code> are <strong>AVCHD camcorder files<\/strong>, an old-school broadcast container that most phones, browsers, and even some editors don\u2019t recognize. The good news is the video inside is already H.264 \u2014 the same codec MP4 uses \u2014 so converting to MP4 is fast and, done right, loses no visible quality. We verified the AVCHD format details, the codecs, and the MTS-vs-M2TS distinction against the standards documentation and Wikipedia\u2019s primary-sourced entries.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Quick answer:<\/strong> <strong>MTS and M2TS are AVCHD camcorder files<\/strong> \u2014 an MPEG-2 <strong>transport-stream<\/strong> container (developed by Sony and Panasonic in 2006) that usually holds <strong>H.264 video with Dolby AC-3 audio<\/strong>. Phones, web browsers, and many editors can\u2019t play or import them directly. Converting to <strong>MP4<\/strong> keeps the same H.264 video, so it plays everywhere and edits cleanly \u2014 <strong>with little to no quality change<\/strong> because the codec is preserved. <code>.MTS<\/code> is the in-camera extension; <code>.M2TS<\/code> is the same thing after import (or off a Blu-ray).<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Jump to a section<\/h2>\n\n\n\n<ul class=\"wp-block-list\"><li><a href=\"#what\">What MTS and M2TS files actually are<\/a><\/li><li><a href=\"#why\">Why they won\u2019t play or import<\/a><\/li><li><a href=\"#mts-vs-m2ts\">MTS vs M2TS: the difference<\/a><\/li><li><a href=\"#quality\">Does converting to MP4 lose quality?<\/a><\/li><li><a href=\"#tool\">Convert MTS\/M2TS to MP4 on xconvert<\/a><\/li><li><a href=\"#faq\">FAQ<\/a><\/li><\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"what\">What MTS and M2TS files actually are<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><code>.MTS<\/code> and <code>.M2TS<\/code> are the file extensions used by <strong>AVCHD<\/strong> \u2014 Advanced Video Coding High Definition. Sony and Panasonic developed AVCHD jointly and introduced it in <strong>2006<\/strong>, specifically for consumer high-definition camcorders. If your footage came off a Sony, Panasonic, Canon, JVC, Hitachi, or Leica camcorder, it\u2019s almost certainly AVCHD.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Three things define the format:<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li><strong>Container: MPEG-2 transport stream.<\/strong> AVCHD multiplexes its audio and video into an MPEG transport stream \u2014 the same packetized format used for digital broadcast and Blu-ray. It\u2019s robust and great for recording to flash memory, but it\u2019s <em>not<\/em> the friendly, web-native container that MP4 is.<\/li><li><strong>Video codec: H.264 \/ MPEG-4 AVC.<\/strong> This is the important part. AVCHD uses <strong>H.264<\/strong> \u2014 the exact same video codec that lives inside the vast majority of MP4 files. The picture data is already in a modern, universally-playable codec; it\u2019s just wrapped in the wrong box.<\/li><li><strong>Audio codec: Dolby AC-3 or linear PCM.<\/strong> AVCHD audio is typically <strong>Dolby Digital (AC-3)<\/strong>, which is where a lot of the \u201cno sound\u201d problems come from \u2014 many players and editors handle AC-3 inconsistently.<\/li><\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Resolutions are full HD: AVCHD supports <strong>1920\u00d71080<\/strong>, <strong>1440\u00d71080<\/strong>, and <strong>1280\u00d7720<\/strong> at the usual broadcast frame rates. So an MTS file is genuinely high-quality footage \u2014 it\u2019s the packaging, not the picture, that causes trouble.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"why\">Why they won\u2019t play or import<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The frustration is real and it has a clear cause: <strong>the transport-stream container has almost no support outside the broadcast\/disc world.<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\"><li><strong>Web browsers can\u2019t play it.<\/strong> MP4 with H.264 enjoys near-universal browser support \u2014 roughly <strong>96\u201397% of users<\/strong> globally, per caniuse. The raw MPEG-2 transport stream that AVCHD uses has <strong>no native browser support<\/strong> at all (MDN lists no browsers for MPEG transport-stream playback). Drop an MTS file into a <code>&lt;video&gt;<\/code> tag or a web uploader and it simply won\u2019t play.<\/li><li><strong>Phones and many apps don\u2019t recognize the extension.<\/strong> Most smartphones, smart TVs, and consumer apps were never built to open <code>.MTS<\/code>\/<code>.M2TS<\/code>. The codec inside (H.264) is fine \u2014 the wrapper is the problem.<\/li><li><strong>Editors choke on the container or the AC-3 audio.<\/strong> Even tools that <em>can<\/em> import AVCHD often need its specific folder structure intact, and the <strong>AC-3 audio<\/strong> is a frequent point of failure \u2014 silent playback after import is a classic AVCHD symptom tied to AC-3 codec availability on the host system.<\/li><\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Converting to MP4 fixes all three at once: MP4 is the format browsers, phones, and editors expect, and switching the audio to AAC sidesteps the AC-3 headaches.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"mts-vs-m2ts\">MTS vs M2TS: the difference<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">People treat these as two formats. They\u2019re essentially the <strong>same container with two different filename conventions<\/strong> \u2014 and there\u2019s no functional video difference between them.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th><\/th><th><code>.MTS<\/code><\/th><th><code>.M2TS<\/code><\/th><\/tr><\/thead><tbody><tr><td>Where it comes from<\/td><td>Recorded <strong>in-camera<\/strong> (on the camcorder\u2019s memory card)<\/td><td>After <strong>import to a computer<\/strong>, or off a <strong>Blu-ray disc<\/strong><\/td><\/tr><tr><td>Filename convention<\/td><td>Legacy <strong>8.3<\/strong> short names (e.g. <code>00001.MTS<\/code>)<\/td><td>Long filenames<\/td><\/tr><tr><td>Typical folder<\/td><td><code>AVCHD\/BDMV\/STREAM<\/code> (sometimes under <code>PRIVATE<\/code>)<\/td><td><code>BDMV\/STREAM<\/code> on the disc<\/td><\/tr><tr><td>Container<\/td><td>MPEG-2 transport stream<\/td><td>BDAV MPEG-2 transport stream (M2TS)<\/td><\/tr><tr><td>Encryption<\/td><td>Camcorder files are <strong>unencrypted<\/strong><\/td><td>Commercial Blu-ray M2TS is often encrypted<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">In short: <strong>MTS = the camcorder\u2019s in-card extension; M2TS = the same data after import, or the Blu-ray\/disc variant.<\/strong> Both hold H.264 video, both convert to MP4 the same way, and you can usually even rename one to the other. The practical takeaway is that the conversion steps below work identically for both.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"quality\">Does converting to MP4 lose quality?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">This is the question that stops people from converting, and the honest answer is reassuring: <strong>usually little to no visible quality change.<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Here\u2019s why. Your AVCHD file already contains <strong>H.264<\/strong> video, and MP4\u2019s most common codec is also <strong>H.264<\/strong>. There are two ways the conversion can go:<\/p>\n\n\n\n<ol class=\"wp-block-list\"><li><strong>Re-mux (copy the stream, change the container).<\/strong> When the video stream is copied unchanged from the transport-stream wrapper into an MP4 wrapper, there is <strong>zero quality loss<\/strong> \u2014 the exact same bytes of video, in a friendlier box.<\/li><li><strong>Re-encode at a matching (or higher) bitrate.<\/strong> If the stream is re-encoded \u2014 for example to also fix the AC-3 audio, change resolution, or compress \u2014 converting H.264 to H.264 at a comparable bitrate is <strong>visually lossless in practice<\/strong>; you won\u2019t see a difference at normal viewing.<\/li><\/ol>\n\n\n\n<p class=\"wp-block-paragraph\">The only time you\u2019d notice quality loss is if you deliberately lower the bitrate or downscale the resolution to shrink the file. Keep the settings at \u201cmatch the source\u201d and your converted MP4 looks the same as the original AVCHD \u2014 just playable everywhere. (This is the same principle that makes <a href=\"https:\/\/www.xconvert.com\/blog\/convert-mov-to-mp4-windows-mac\/\">converting MOV to MP4<\/a> lossless when the underlying H.264 video is preserved.)<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"tool\">Convert MTS\/M2TS to MP4 on xconvert<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The <a href=\"https:\/\/www.xconvert.com\/convert-mts-to-mp4\">xconvert MTS-to-MP4 converter<\/a> handles both <code>.MTS<\/code> and <code>.M2TS<\/code> and keeps your 1080p quality. Here\u2019s the flow:<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1600\" height=\"1250\" src=\"https:\/\/www.xconvert.com\/blog\/wp-content\/uploads\/2026\/06\/step-01-control-74.png\" alt=\"Leave the optimized defaults and click Convert to get your MP4\" class=\"wp-image-1373\" srcset=\"https:\/\/www.xconvert.com\/blog\/wp-content\/uploads\/2026\/06\/step-01-control-74.png 1600w, https:\/\/www.xconvert.com\/blog\/wp-content\/uploads\/2026\/06\/step-01-control-74-300x234.png 300w, https:\/\/www.xconvert.com\/blog\/wp-content\/uploads\/2026\/06\/step-01-control-74-1024x800.png 1024w, https:\/\/www.xconvert.com\/blog\/wp-content\/uploads\/2026\/06\/step-01-control-74-768x600.png 768w, https:\/\/www.xconvert.com\/blog\/wp-content\/uploads\/2026\/06\/step-01-control-74-1536x1200.png 1536w\" sizes=\"auto, (max-width: 1600px) 100vw, 1600px\" \/><\/figure>\n\n\n\n<ol class=\"wp-block-list\"><li>Open <a href=\"https:\/\/www.xconvert.com\/convert-mts-to-mp4\">xconvert.com\/convert-mts-to-mp4<\/a> and click <strong>Upload<\/strong> to add your file \u2014 <strong>From my Computer<\/strong>, <strong>From Google Drive<\/strong>, or <strong>From Dropbox<\/strong>. Both <code>.MTS<\/code> and <code>.M2TS<\/code> work.<\/li><li>To keep maximum quality, leave the defaults \u2014 they\u2019re optimized for the best result. The page note says <em>\u201cOur defaults are optimized for the best results.\u201d<\/em><\/li><li>To control the output, open <strong>Advanced Options<\/strong> (the gear). Under <strong>File Compression<\/strong> you can pick a <strong>Quality Preset<\/strong> (e.g. <strong>Very High (Recommended)<\/strong>), a <strong>Specific file size<\/strong>, <strong>Constant Bitrate<\/strong>, <strong>Variable Bitrate<\/strong>, or <strong>Constant Quality<\/strong>.<\/li><li>Want the original frame size? Under <strong>Video resolution<\/strong> choose <strong>Keep original<\/strong> (or pick a <strong>Preset Resolution<\/strong> to downscale).<\/li><li>Need just a clip? Use <strong>Trim<\/strong> \u2192 <strong>Time Range<\/strong> to set start and end points; leave it on <strong>Unchanged<\/strong> to convert the whole file.<\/li><li>Start the conversion and download your MP4. It will now play on phones, browsers, and editors that rejected the AVCHD file.<\/li><\/ol>\n\n\n\n<p class=\"wp-block-paragraph\">Your file uploads over an encrypted connection, is processed on our servers, and is <strong>deleted automatically a few hours later<\/strong>. Nothing lingers.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For related workflows: <a href=\"https:\/\/www.xconvert.com\/blog\/convert-mov-to-mp4-windows-mac\/\">Convert MOV to MP4 on Windows and Mac<\/a> (same H.264-preserving approach for iPhone\/QuickTime video), and <a href=\"https:\/\/www.xconvert.com\/blog\/h264-vs-h265-which-to-use\/\">H.264 vs H.265: which to use<\/a> (when you also want to shrink the file with a newer codec).<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"faq\">FAQ<\/h2>\n\n\n\n<h5 class=\"wp-block-heading\">Why won\u2019t my MTS file play on my computer or phone?<\/h5>\n\n\n\n<p class=\"wp-block-paragraph\">Because <code>.MTS<\/code>\/<code>.M2TS<\/code> are <strong>AVCHD camcorder files<\/strong> in an MPEG-2 <strong>transport-stream<\/strong> container, which most phones, browsers, and consumer apps don\u2019t support \u2014 and the <strong>Dolby AC-3<\/strong> audio inside often causes silent playback even where the video shows. The H.264 video itself is fine; converting the file to <strong>MP4<\/strong> puts that same video into a container everything can open.<\/p>\n\n\n\n<h5 class=\"wp-block-heading\">Is MTS the same as M2TS?<\/h5>\n\n\n\n<p class=\"wp-block-paragraph\">Essentially <strong>yes<\/strong> \u2014 they\u2019re the same AVCHD\/transport-stream data with two naming conventions. <code>.MTS<\/code> is the <strong>in-camera<\/strong> extension (legacy 8.3 short filenames); <code>.M2TS<\/code> is the extension <strong>after importing to a computer<\/strong>, and also the variant used on <strong>Blu-ray discs<\/strong>. There\u2019s no functional video difference, and both convert to MP4 identically.<\/p>\n\n\n\n<h5 class=\"wp-block-heading\">Does converting MTS to MP4 lose quality?<\/h5>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Usually not noticeably.<\/strong> AVCHD already uses <strong>H.264<\/strong>, and so does MP4, so the video can be re-muxed (copied) into MP4 with <strong>zero quality loss<\/strong>, or re-encoded H.264\u2192H.264 at a matching bitrate for <strong>visually lossless<\/strong> results. You only lose quality if you deliberately lower the bitrate or downscale the resolution.<\/p>\n\n\n\n<h5 class=\"wp-block-heading\">Why does my AVCHD video have no sound after converting?<\/h5>\n\n\n\n<p class=\"wp-block-paragraph\">AVCHD audio is typically <strong>Dolby AC-3<\/strong>, which some systems and editors don\u2019t decode cleanly. Converting to MP4 with <strong>AAC audio<\/strong> is the reliable fix \u2014 it\u2019s the audio format MP4 expects and that players handle universally, which is why \u201cconvert to MP4 first\u201d is the standard advice before editing AVCHD footage.<\/p>\n\n\n\n<h5 class=\"wp-block-heading\">Can I edit MTS files directly in my video editor?<\/h5>\n\n\n\n<p class=\"wp-block-paragraph\">Sometimes, but it\u2019s fragile \u2014 many editors need the <strong>full AVCHD folder structure<\/strong> intact and stumble on the <strong>AC-3 audio<\/strong>. The recommended workflow is to <strong>convert to MP4 (with AAC audio) first<\/strong>, then import the MP4. It imports cleanly and plays back without the silent-audio issue.<\/p>\n\n\n\n<h5 class=\"wp-block-heading\">What camcorders record MTS\/M2TS files?<\/h5>\n\n\n\n<p class=\"wp-block-paragraph\">AVCHD was developed by <strong>Sony and Panasonic<\/strong> (2006) and is used across consumer HD camcorders from <strong>Sony, Panasonic, Canon, JVC, Hitachi, and Leica<\/strong>, among others. If your HD camcorder footage has a <code>.MTS<\/code> or <code>.M2TS<\/code> extension, it\u2019s AVCHD.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Sources<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><em>Last verified 2026-06-25.<\/em><\/p>\n\n\n\n<ul class=\"wp-block-list\"><li><a href=\"https:\/\/en.wikipedia.org\/wiki\/AVCHD\">Wikipedia \u2014 AVCHD<\/a> \u2014 AVCHD developed jointly by Sony and Panasonic, introduced 2006 for HD consumer camcorders; MPEG transport-stream container; H.264\/MPEG-4 AVC video; Dolby AC-3 and linear PCM audio; 1920\u00d71080 \/ 1440\u00d71080 \/ 1280\u00d7720 resolutions; <code>.MTS<\/code> (camcorder) vs <code>.m2ts<\/code> (after import) extensions; manufacturer list.<\/li><li><a href=\"https:\/\/en.wikipedia.org\/wiki\/.m2ts\">Wikipedia \u2014 .m2ts<\/a> \u2014 M2TS as the BDAV MPEG-2 Transport Stream container; AVCHD uses legacy 8.3 <code>.MTS<\/code> filenames while Blu-ray uses long <code>.m2ts<\/code> names; files placed in the <code>BDMV<\/code>\/<code>STREAM<\/code> directory; holds H.264\/MPEG-4 AVC video.<\/li><li><a href=\"https:\/\/www.loc.gov\/preservation\/digital\/formats\/fdd\/fdd000636.shtml\">Library of Congress \u2014 MPEG-2 Transport Stream for BDAV and AVCHD<\/a> \u2014 format description for the AVCHD\/Blu-ray transport-stream container.<\/li><li><a href=\"https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/Media\/Guides\/Formats\/Video_codecs\">MDN \u2014 Web video codec guide<\/a> \u2014 H.264\/AVC is broadly compatible across all major browsers; MPEG-2 \/ MPEG transport stream has no practical browser support.<\/li><li><a href=\"https:\/\/caniuse.com\/mpeg4\">caniuse \u2014 MPEG-4 \/ H.264 video format<\/a> \u2014 H.264\/MP4 near-universal browser support (~96\u201397% global).<\/li><\/ul>\n","protected":false},"excerpt":{"rendered":"<p>MTS\/M2TS are AVCHD camcorder files that won&#8217;t play or import. Convert them to MP4 (same H.264 video) to play everywhere \u2014 with little to no quality loss.<\/p>\n","protected":false},"author":4,"featured_media":1375,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[5,14],"tags":[],"class_list":["post-970","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-how-to-guides","category-tools"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Convert MTS\/M2TS (AVCHD Camcorder) to MP4 \u2014 No Quality Loss<\/title>\n<meta name=\"description\" content=\"MTS\/M2TS are AVCHD camcorder files that won&#039;t play or import. 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