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Convert FLV to MTS - Flash Video to HD AVCHD Format

Transform Flash videos into AVCHD format for HD editing and Blu-ray projects.

Step 1: Upload your files

You can also Drag and drop files.

Step 2: Choose format
Step 3: Convert files

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Why Convert FLV to MTS?

Flash Video (FLV) was once the dominant format for online video, powering everything from YouTube to countless streaming sites. But Flash is now obsolete, and those old FLV files need a new home. MTS (AVCHD) offers a modern alternative with full HD support and broad compatibility with video editing software.

If you have archived FLV videos you want to edit in professional software like Adobe Premiere, Final Cut Pro, or Sony Vegas, converting to MTS gives you a format these applications handle natively. In our testing, MTS files integrate seamlessly with timeline-based editors that struggle with legacy Flash containers.

How to Convert FLV to MTS

  1. Upload your FLV file - Drag and drop your Flash video or click to browse
  2. Select MTS as output - Choose AVCHD format for HD-compatible output
  3. Download your MTS file - Get your converted video ready for editing or archiving

The entire process runs in your browser. No software installation, no account creation, no waiting in conversion queues.

FLV vs MTS: Technical Comparison

Understanding the differences helps you know what to expect from your converted files:

  • Container format - FLV is a Flash container; MTS is the AVCHD container developed by Sony and Panasonic
  • Video codec - FLV typically uses H.264 or older VP6; MTS uses H.264/MPEG-4 AVC at higher bitrates
  • Resolution support - FLV varies widely (often 360p-720p); MTS supports full 1080i/1080p HD
  • Audio - FLV uses MP3 or AAC; MTS uses Dolby Digital AC-3 or uncompressed LPCM
  • Industry support - FLV is deprecated; MTS is actively used in HD camcorders and Blu-ray production

MTS files are larger than FLV due to higher bitrates, but the quality improvement for HD content is significant.

Common Use Cases

Archiving Old Flash Content

If you downloaded videos from early YouTube, Newgrounds, or Flash-based sites years ago, those FLV files may not play reliably anymore. Converting to MTS preserves your content in a format with long-term support.

Professional Video Editing

Video editing software like Adobe Premiere and Final Cut Pro work better with MTS than FLV. Import your converted files directly into project timelines without transcoding delays.

Blu-ray Authoring

Creating Blu-ray discs requires AVCHD-compatible source files. MTS is the native format for Blu-ray authoring software, making your converted FLV videos ready for disc burning.

What to Expect

Converting from FLV to MTS involves re-encoding the video. Here is what happens:

  • Quality - If your source FLV is low resolution (480p or lower), the MTS output will match that resolution. Conversion cannot add detail that was not in the original.
  • File size - MTS files are typically larger due to higher bitrate encoding. A 50MB FLV might become 150-200MB as MTS.
  • Compatibility - Your converted MTS file will work in HD video editors, media players like VLC, and Blu-ray authoring tools.

Alternative Formats to Consider

Depending on your goal, other target formats might serve you better:

  • FLV to MP4 - Best for general playback and sharing. MP4 is universally compatible with all devices and platforms.
  • FLV to MOV - Preferred for Apple ecosystem and Final Cut Pro workflows.
  • FLV to MKV - Good for archiving with multiple audio tracks or subtitles.

Choose MTS specifically when you need AVCHD compatibility for camcorder workflows, Blu-ray authoring, or software that expects this format.

Works on Any Device

Our browser-based converter runs on:

  • Windows, Mac, Linux, Chromebook
  • Chrome, Firefox, Safari, Edge
  • Tablets and mobile devices

No plugins, no Flash player (ironically), no downloads required. Just upload and convert.

Pro Tip

If your FLV source is low resolution (360p or 480p), consider converting to MP4 instead of MTS. The AVCHD format is designed for HD content, and you will get unnecessarily large files without the quality benefits.

Common Mistake

Expecting quality improvement after conversion. MTS cannot add resolution or detail to low-quality FLV sources. If the original looks pixelated, the converted file will too.

Best For

Archiving Flash-era videos for Blu-ray authoring, or importing old FLV content into professional HD video editing software like Premiere Pro or Final Cut Pro.

Not Recommended

Not ideal for web sharing or mobile playback. If you just want to watch or share the video, convert to MP4 instead. MTS files are larger and less universally compatible for casual use.

Frequently Asked Questions

FLV (Flash Video) is a container format developed by Adobe for delivering video over the internet. It was widely used on YouTube, Vimeo, and other streaming sites before HTML5 video became standard. FLV typically uses H.264 or VP6 codecs for video and MP3 or AAC for audio.

MTS is the file extension for AVCHD (Advanced Video Coding High Definition), a format developed by Sony and Panasonic for HD camcorders. It uses H.264/MPEG-4 AVC video compression with Dolby Digital or LPCM audio, supporting 720p, 1080i, and 1080p resolutions.

No. Conversion cannot add detail that was not in the original file. If your FLV is 480p, the MTS will also be 480p. However, MTS encoding at higher bitrates may preserve existing quality better for editing workflows.

MTS uses higher bitrate encoding than most FLV files to maintain quality for professional editing and Blu-ray authoring. A 50MB FLV commonly becomes 150-200MB as MTS due to this bitrate difference.

Yes. Adobe Premiere Pro natively supports MTS/AVCHD files. You can import MTS directly into your project timeline without additional transcoding or plugins.

They are closely related. Both use the AVCHD format, but MTS is typically used for camcorder recordings while M2TS is used for Blu-ray disc content. Most video software treats them identically.

Yes. VLC Media Player, Windows Media Player (with codecs), and most modern media players support MTS playback. Mac users can play MTS in VLC or QuickTime with appropriate codecs installed.

MP4 is better for general playback and sharing. Choose MTS when you specifically need AVCHD compatibility for HD camcorder workflows, Blu-ray authoring software, or professional video editors that prefer this format.

Conversion time depends on file size and your internet connection. A typical 100MB FLV file converts in 1-3 minutes. Larger files or slower connections take proportionally longer.

Conversion happens in your browser using client-side processing. Your files are not uploaded to external servers, keeping your content private throughout the conversion process.

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