Generate perfectly-timed SRT subtitle files from your FLV videos. Create subtitles for archived Flash content, legacy web videos, and preserved downloads.
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 subtitle timing and text with our editor.
Download your FLV subtitles as an SRT file.
Yes! Upload your archived FLV file, Sonix transcribes the audio with word-level timestamps, then export to SRT format. Perfect for making legacy content accessible.
Sonix generates word-level timestamps from FLV audio tracks with precision within a few hundred milliseconds. Even older FLV files with clear speech produce accurate timing.
Yes! Create SRT subtitles for legacy content, then either burn them into a converted video file or provide them alongside the original for accessibility.
FLV doesn't support embedded subtitles like MKV. Convert to MP4 and mux the SRT file during conversion, or use media players that support external SRT files.
Yes! Enable speaker detection when exporting to SRT. Perfect for archived interviews, podcasts, and multi-person content from the Flash era.
Upload FLV to Sonix, transcribe, edit timing if needed, export SRT. For modern playback, convert FLV to MP4 and include the SRT subtitles.
Word-level timing ensures your subtitles sync perfectly with the audio.
SRT works with YouTube, Vimeo, Facebook, and all major video platforms.
Adjust timing, line length, and caption duration to your needs.
Import directly into Final Cut Pro, Premiere, DaVinci Resolve, and more.
It is so easy to use, very intuitive. Everything 'works'. It is so simple and hassle-free.
The accuracy of the initial transcription was better than any I've used to date, and making adjustments was very simple.
Amazing for foreign videos that need subtitles. The platform is super easy to use and gave me EXACTLY what I was looking for.
This is the greatest transcription service I've ever seen. I am so pleased with the results and I am recommending your services 100 out of 10.
I cannot believe how easy, quick, and accurate this is.
I'm fully going to recommend Sonix to everyone! Most people are going to be blown away!
Great product. Been waiting for this.
You saved me! I got everything done in three days and I was sure it will take me a month.
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AI transcription and translation in 53+ languages.
