Convert Advanced Audio Coding (.aac) to Flash Video (.flv) online for free. Fast, secure audio conversion with no watermarks or registration.
Upload your .aac file by dragging it into the upload area or clicking to browse.
Choose your output settings. The default settings work great for most files.
Click Convert and download your .flv file when it's ready.
AAC is a modern audio codec, while FLV (Flash Video) is Adobe's legacy streaming container that powered web video from 2003 until Flash's deprecation in 2020. Converting AAC to FLV packages audio inside the Flash container, which is still required by some legacy streaming servers, archived web content restoration projects, and older RTMP-based media workflows.
Legacy RTMP ingest servers, some surveillance DVR systems, and older content management platforms still expect FLV input. Flash may be dead in browsers, but RTMP streaming infrastructure (used by OBS, Wirecast, and many CDNs) continues to use FLV as its transport container. If you need to push audio to an RTMP endpoint or feed content to a system that only reads FLV, this conversion is necessary.
FFmpeg muxes the AAC stream directly into an FLV container, since FLV natively supports AAC audio (added in Flash Player 9). A minimal video track (1x1 pixel, 1 fps) may be added for compatibility with FLV players that require a video stream. The FLV container adds minimal overhead — roughly 1 KB per second for metadata and framing.
When using stream copy, the audio quality is identical to the AAC source — FLV is just a container and does not re-encode the audio. The AAC bitstream is preserved byte-for-byte.
| Device | AAC | FLV |
|---|---|---|
| Windows PC | Partial | Partial |
| macOS | Native | Partial |
| iPhone/iPad | Native | Partial |
| Android | Partial | Partial |
| Linux | Partial | Partial |
| Web Browser | No |
Resolution: N/A
Bitrate: 320 kbps
OGG Vorbis preferred
Resolution: N/A
Bitrate: 256 kbps
AAC format required
Resolution: N/A
Bitrate: 128 kbps
Lossless FLAC/WAV for best quality
Resolution: N/A
Bitrate: 128 kbps
MP3 mono for spoken word
AAC to FLV serves the shrinking but still-present ecosystem of RTMP infrastructure and legacy Flash-based systems. The conversion is lossless when stream-copying AAC, since FLV natively supports the AAC codec.
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| No |
| Funktion | AAC | FLV |
|---|---|---|
| Fullstandigt namn | Advanced Audio Coding | Flash Video |
| Filandelse | .aac | .flv |
| Bast for | Superior to MP3 | Small file size |