Convert Flash Video (.flv) to MPEG-4 Audio (.m4a) online for free. Fast, secure video conversion with no watermarks or registration.
Conversion settings — add a file to adjust
Upload your .flv 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 .m4a file when it's ready.
FLV (Flash Video) files frequently contain audio tracks encoded with AAC-LC at 44.1 kHz — the same codec used in M4A files. M4A is Apple's audio-only variant of the MPEG-4 container, distinguished from MP4 solely by its file extension. iTunes, Apple Music, and all iOS/macOS devices treat M4A as the native audio format. When the FLV already contains AAC audio, the conversion can extract the audio stream without any re-encoding, producing a bit-perfect M4A copy.
M4A is the standard audio format for the Apple ecosystem. Extracting audio from FLV to M4A produces files that integrate seamlessly with iTunes, Apple Music, iCloud Music Library, and every Apple device. M4A also supports rich metadata (album art, lyrics, chapters) that FLV cannot carry. If the FLV already contains AAC audio, extraction is lossless and near-instant.
When the FLV contains AAC-LC audio, FFmpeg performs a stream copy — the AAC bitstream is extracted verbatim and wrapped in an M4A container (MPEG-4 Part 14 with 'M4A ' brand). No transcoding occurs, so the process is instantaneous with zero quality loss. When the source is MP3 or Nellymoser, FFmpeg transcodes to AAC-LC at the specified bitrate. M4A supports sample rates up to 96 kHz and bit depths up to 24-bit.
For AAC source audio in FLV, the M4A output is bit-identical — there is zero quality loss because no transcoding happens. For MP3 sources, transcoding to AAC introduces a small generation loss, but AAC is perceptually superior at equivalent bitrates. Using 256 kbps VBR AAC for transcoded content produces results that are virtually transparent to the original.
| Device | FLV | M4A |
|---|---|---|
| Windows PC | Partial | Partial |
| macOS | Partial | Native |
| iPhone/iPad | Partial | Native |
| Android | Partial | Partial |
| Linux | Partial | Partial |
| Web Browser | No |
Resolution: 1920x1080
Bitrate: 8-12 Mbps
H.264 recommended for fast processing
Resolution: 1080x1080
Bitrate: 3.5 Mbps
Square or 9:16 for Reels
Resolution: 1080x1920
Bitrate: 4 Mbps
9:16 vertical, under 60s ideal
Resolution: 1280x720
Bitrate: 5 Mbps
Under 140s, 512MB max
Resolution: 960x540
Bitrate: 2 Mbps
16MB limit for standard, 64MB for document
Resolution: 1280x720
Bitrate: 4 Mbps
FLV to M4A conversion is the fastest and cleanest path to Apple-native audio from Flash video files. Stream copy for AAC sources means zero quality loss, and the M4A output integrates perfectly with the entire Apple ecosystem.
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Funcționează oriunde
| No |
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| Caracteristică | FLV | M4A |
|---|---|---|
| Nume complet | Flash Video | MPEG-4 Audio |
| Extensie | .flv | .m4a |
| Cel mai potrivit pentru | Small file size | Better than MP3 |