Create accessible closed captions from your FLV videos. Bring legacy Flash content into accessibility compliance with professional 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
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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.
Fine-tune timing and formatting for accessibility.
Download closed captions in SRT, VTT, or SCC format.
Captions include speaker identification and sound descriptions (music, applause, typing sounds) for deaf and hard-of-hearing viewers. Subtitles assume the viewer can hear and focus on translating dialogue.
Yes! Sonix generates captions meeting ADA and Section 508 requirements. Add speaker labels and sound descriptions to bring legacy Flash content into compliance.
Yes! After transcription, add non-speech descriptions like [music playing], [static noise], or [applause] in Sonix's editor for fully accessible captions.
Upload FLV, transcribe with Sonix, add speaker labels and sound descriptions, then export captions. Convert video to MP4 for modern accessible playback.
SRT is most universal for archival purposes. Include SRT files alongside your FLV archives (or converted MP4s) for accessibility.
Accuracy depends on audio quality, not file age. FLV files with clear speech transcribe at 99%+ accuracy. Lower-bitrate audio from early web videos may have slightly reduced accuracy.
Create captions that make your content accessible to deaf and hard-of-hearing viewers.
Meet accessibility requirements with properly formatted closed captions.
Add non-speech elements like [music] and [applause] for full context.
Captions make video content searchable and improve discoverability.
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