MTS to F4V Converter

Convert MTS to F4V: Read This First

MTS is the AVCHD stream a Sony, Panasonic, or Canon camcorder writes to its memory card — H.264 video with AC-3 or LPCM audio in an MPEG-2 transport stream. F4V is Adobe's MP4-based Flash container, introduced with Flash Player 9 Update 3 on December 3, 2007 to carry H.264 and AAC for Flash-era streaming. The honest framing for 2026: F4V was built for a workflow the web has abandoned. Adobe ended Flash Player support on December 31, 2020 and blocked Flash content from running on January 12, 2021, and no browser ships Flash anymore. The nuance that separates F4V from SWF or FLV: because F4V is built on the same ISO base media file format as MP4, the file you get is still playable in modern desktop players like VLC and anything ffmpeg-based — it is the Flash delivery workflows around it that are dead, not the file itself. If you just want camcorder footage that plays everywhere, convert MTS to MP4 instead — it is literally the same container family (ISO base media) without the Flash branding, and every browser, phone, and editor plays it. Only continue with F4V if a specific legacy system genuinely expects a .f4v.

MTS (AVCHD) Format at a Glance

F4V Format at a Glance

How to Convert MTS to F4V

1. Upload Your MTS File: Drag and drop your .MTS clip onto the page, or click "Add Files" to browse. You can queue several camcorder clips and they share the same output settings.
2. Confirm the Video Codec: Open "Show All Options" and check Video Codec — the default for F4V is H.264, which matches the codec already inside your MTS. This is a re-encode (H.264 to H.264), not a stream copy, so there is a small generational quality cost; keep the Quality Preset high to minimize it.
3. Set Quality, Resolution, or Trim (Optional): Use the Quality Preset dropdown under File Compression (default "Very High (Recommended)"), or switch to Specific file size for a hard MB target. Scale the frame with Resolution Percentage or a Preset Resolution, and switch Trim from "Unchanged" to a Time Range to export one section.
4. Convert and Download: Click Convert and download your .f4v. No sign-up, no watermark.

Frequently Asked Questions

Is F4V the same thing as MP4?

Nearly. Both are built on the ISO base media file format (MPEG-4 Part 12), both carry H.264 video, and both carry AAC audio, which is why F4V is sometimes called "Flash MP4." The practical difference is branding and ecosystem: F4V was Adobe's variant aimed at Flash Player streaming, while MP4 is the universal container that browsers, phones, smart TVs, and editors all play natively. If you do not specifically need a .f4v file, MTS to MP4 gives you the same H.264/AAC payload in the container the whole world supports.

Will the F4V file play anywhere in 2026?

Not in a browser — every major browser removed Flash after Adobe's December 31, 2020 end-of-life and the January 12, 2021 content block. But because F4V is structurally an MP4, the file itself still opens in standalone desktop players like VLC and anything built on ffmpeg. So a .f4v is "dead" in the sense that its Flash delivery workflow is gone, not in the sense that the bytes are unreadable. For playback that just works on phones and the web, convert to MP4 instead.

Does converting MTS to F4V re-encode the video or copy it?

It re-encodes. Your MTS already holds H.264, and the F4V output is also H.264, but this tool transcodes rather than stream-copying, so the video is decoded and re-encoded once. That introduces a small generational quality loss — keep the Quality Preset at "Very High (Recommended)" to keep it negligible. If you need to avoid any re-encode of the video stream entirely, a like-for-like MP4 remux is the closer match; see MTS to MP4.

What happens to the AC-3 audio from my camcorder?

It is transcoded to AAC. F4V does not carry Dolby AC-3 — its supported audio is AAC (and MP3 in this tool), so the AC-3 or LPCM track from your AVCHD clip is re-encoded to AAC during conversion, and a 5.1 surround mix is downmixed to stereo. This matches how F4V was always used in the Flash pipeline, where AAC was the standard audio codec.

Why would I convert to F4V instead of FLV or SWF?

F4V is the more capable of the three Flash-era targets: it natively carries H.264 (so it preserves your camcorder's modern codec), whereas MTS to FLV defaults to the older, less efficient Sorenson Spark codec and MTS to SWF wraps an even more constrained Flash movie. If a legacy system genuinely needs a Flash container and can read F4V, it is the best-quality option of the three. If nothing requires Flash, none of them is the right answer — use MP4.

What is the reverse conversion?

If you already have an .f4v and need an AVCHD camcorder stream — for example to feed a device or workflow that expects transport-stream .mts files — use F4V to MTS. That re-wraps the H.264 video into an MPEG-2 transport stream with AC-3 audio, which is the AVCHD camcorder format.

Can I keep the original 1080p resolution and trim the clip?

Yes. Under Video resolution, leave "Keep original" selected to match the source dimensions exactly (AVCHD typically records 1920x1080), or scale down with Resolution Percentage or a Preset Resolution. To export just one segment — useful for trimming the brief lead-in or lead-out some camcorders buffer around the record button — switch Trim from "Unchanged" to a Time Range and set the start and duration. In our testing, a 1-minute 1080p AVCHD clip at the default Very High preset converts to F4V in well under a minute on a typical broadband upload, with the output indistinguishable from the source at normal viewing distance.

What happens to my file after I convert it?

Your MTS is uploaded over an encrypted connection, processed on our servers, and deleted automatically a few hours after conversion. Files are never shared or made public, and there is no sign-up or watermark.