Create WebVTT caption files from your FLV videos for HTML5 video players. Bring legacy Flash content into the modern web with accessible captions.
Legacy Flash video format for web streaming
FLV files are also known as Flash Video Files. Most FLV files use Adobe Flash Player or Adobe Air to transmit audio/video over the Internet. Most embedded videos on the Internet are FLV files, but with the introduction of HTML5 videos, many streaming services have dropped usage of FLV files. You can sometimes see FLV files with a F4V file extension. FLV files aren’t as common now, but we still support them at Sonix.
Older format - quality varies significantly
Sign up for Sonix's free trial. Includes 30 minutes free.
Upload your FLV file from your computer or cloud storage.
Choose from 53+ languages spoken in your file.
Sonix AI transcribes and timestamps your FLV audio.
Fine-tune caption timing and text with our editor.
Download your FLV captions as a WebVTT file.
Yes! Sonix transcribes your FLV video and exports to WebVTT format. You'll also need to convert the video to MP4 or WebM for HTML5 compatibility.
Convert FLV to MP4 using FFmpeg or HandBrake, transcribe with Sonix to get VTT captions, then link both to your HTML5 video element for modern playback.
Yes! WebVTT supports CSS styling for fonts, colors, positioning, and backgrounds. Modernize the presentation of your legacy content.
First convert FLV to MP4 or WebM, then add a track element to your HTML5 video element pointing to your VTT file. Flash is no longer supported in browsers.
Yes! VTT captions meet WCAG accessibility guidelines when properly implemented. Essential for making archived Flash content accessible on the modern web.
Yes! Transcribe once, then use Sonix's translation feature to create versions in 50+ languages. Perfect for bringing legacy content to international audiences.
VTT is the web standard for captions, supported by all modern browsers.
Apply CSS styling for colors, fonts, positioning, and more.
Word-level timestamps ensure perfect sync with your video.
Works with all HTML5 video players and web platforms.
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AI transcription and translation in 53+ languages.
