Transform your FLV videos into professional subtitles in multiple formats. Make legacy Flash content accessible and modern with professional subtitles.
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 your FLV with word-level timestamps.
Customize line length, duration, and subtitle breaks.
Download subtitles as SRT, VTT, or other formats.
Sonix exports FLV transcriptions to all major subtitle formats: SRT (universal), VTT (web), ASS/SSA (styled), SBV (YouTube), and more.
SRT is most compatible when converting FLV to MP4 or other modern formats. Most video editors and players support SRT without issues.
Convert your FLV to MP4, export SRT from Sonix, then either upload the SRT separately to YouTube or burn subtitles into the video before uploading.
Yes! Export to ASS/SSA format for advanced styling options including custom fonts, colors, positioning, and animations.
Most social platforms require burned-in subtitles. Convert FLV to MP4, export SRT from Sonix, then use video editing software to embed them permanently.
Sonix timestamps are audio-based, ensuring accurate sync regardless of video encoding variations common in FLV files from different eras.
Export subtitles as SRT, VTT, FCPXML, and more for any platform.
Control line length, duration, and style of your subtitles.
Create subtitles in 53+ languages from your original audio.
Permanently embed subtitles into your video with one click.
I absolutely loved how well the software was able to distinguish between individual speakers. Exceptional product and well-polished.
Your UI and UX was one of the best I've seen. And I've seen a lot of them. Clean, simple, and pretty easy to edit.
You saved me! I got everything done in three days and I was sure it will take me a month.
I love the efficiency, accuracy, and simplicity of going through the transcript to edit and then save it into word. Seamless.
It was so easy and convenient to use. The transcripts require minimal editing and the delivery time is fantastic!
I love Sonix. It's accurate, intuitive, friendly and simple to use for the technically inept like me! I typically use it for English but we used it this time in French and it was g...
So fast, so easy. This has saved me hours for every 20 minutes of recording.
I tried Sonix, and it’s amazing! Seriously, I think that you will revolutionize journalism.
Try Sonix free with 30 minutes minutes of transcription. No credit card required.
AI transcription and translation in 53+ languages.
