Step 1: Transfer your FLV files using the button above or by slide and deposit.
Step 2: Click the 'Convert' button to start the conversion.
Step 3: Retrieve your converted AUDIO files.
FLV to AUDIO Conversion FAQ
How do I extract the audio from my FLV file as AUDIO?
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Upload the FLV file and the converter demuxes the audio stream, then transcodes it to AUDIO. There is no second video pass — the visual track is discarded immediately so extraction is much faster than a full re-encode. FLV is the Flash Video container that carried essentially all web video from roughly 2003 until Flash was switched off at the end of 2020. Audio here is a generic target: the converter extracts the sound and picks a widely-playable encoding for it.
Is converting FLV to AUDIO a second round of lossy compression?
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Yes, and it is worth planning around. Both formats are lossy, so the AUDIO encoder is working from audio that has already been through one psychoacoustic pass, and its own decisions compound the first set. At 192 kbps or above the result is still transparent for most listening. If you have a lossless master anywhere, encoding the AUDIO from that instead avoids the double pass entirely. FLV typically holds Sorenson Spark or H.264 video with MP3 or AAC audio, wrapped in a stream format designed for RTMP delivery. Output defaults to MP3 at 192 kbps, which is transparent for most material and readable by every device.
Can I tag the AUDIO with artist and album information?
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Yes, and it is a genuine gain over FLV, which has nowhere dependable to store any of it. AUDIO carries title, artist, album, year, track number and embedded cover art in the container itself, so a music library files it correctly without a manual pass. Choosing the target automatically is the fastest path when all you want is the sound out of a file, with no codec decisions to make.
What audio bitrate does the extracted AUDIO use?
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Default bitrate for lossy AUDIO is 192 kbps, which is transparent for music. You can override to 320 kbps (audiophile) or 96-128 kbps (voice / podcast / smaller file). The bitrate dropdown is exposed in the advanced options before you click convert.
Will I lose audio quality going from FLV to AUDIO?
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If AUDIO is lossless (WAV, FLAC), every sample is preserved exactly. If AUDIO is lossy (MP3, AAC, OGG, Opus), the AUDIO codec recompresses the source audio — at 192 kbps the result is transparent for almost all content. Going lossy → lossless never recovers detail already discarded.
Does the AUDIO keep the original sample rate?
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By default yes — 48 kHz audio in your FLV stays 48 kHz in the AUDIO output. For CD-burning or legacy player compatibility you can downsample to 44.1 kHz via the sample-rate dropdown; the resampler is high-quality SoX-grade.
Can I extract audio from multiple FLV files to AUDIO in one batch?
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Yes — drop a folder of FLV files and we extract audio in parallel. Premium users get more parallel workers; on a 50-file batch this is the difference between a couple of minutes and ten-plus minutes.
Will the AUDIO be tagged with title / artist / album metadata?
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If the FLV carries chapter or stream metadata, we copy title / artist / album fields into the AUDIO container. If not, the AUDIO comes out untagged — use a tag editor (Mp3tag, Picard) post-export for richer tagging.
How long does extracting AUDIO from a 1-hour FLV take?
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Audio demux + encode is fast — typically 5 to 15% of the source duration. A 1-hour FLV → AUDIO finishes in roughly 3 to 9 minutes on the standard pipeline; Premium parallelism cuts this further for batch jobs.
Can I extract just a section of the FLV audio as AUDIO?
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Not in this tool directly — extract the full audio as AUDIO, then use /audio-trim/ or /audio-cutter/ to clip the section. The two-step path is usually faster than a combined operation and gives you precise waveform-level control.
Is my FLV file private during the audio extraction?
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Yes — same privacy model as every conversion: isolated workers, no human review, automatic deletion within minutes of completion. The detailed retention window is on /privacy/.
Why does the AUDIO file have silent gaps where the FLV had sound?
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Almost always a wrong-stream selection: FLV had multiple audio tracks and the demuxer picked an empty or auxiliary stream. Use the advanced "audio stream" picker to select stream 0, 1, 2 explicitly, or target an AUDIO container that supports multi-track output (FLAC, OGG).
FLV (Flash Video) is a video container format developed by Adobe. It is commonly used for online video streaming and is supported by Adobe Flash Player.
