Step 1: Provide your FLV files using the button above or by toss and let go.
Step 2: Click the 'Convert' button to start the conversion.
Step 3: Fetch your converted AUDIO files.
FLV to AUDIO Conversion FAQ
How do I extract just the audio track from FLV as AUDIO?
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Upload the FLV file and the converter demuxes the audio stream from the FLV container, then transcodes it into AUDIO. Video frames are discarded — no second video pass, no quality loss beyond what the AUDIO codec itself introduces. 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.
Which audio track gets extracted when my FLV has several?
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By default stream 0 (the first audio track, usually the main mix). If your FLV carries commentary, dubs, or descriptive audio on additional tracks, the advanced "audio stream" picker lets you pick 1, 2, 3... explicitly. The track list is shown in the upload preview so you do not pick blind.
What bitrate does the AUDIO file use?
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Default AUDIO bitrate is 192 kbps (transparent for music to most ears). Override to 320 kbps for audiophile output, or 96-128 kbps for voice / podcast where the smaller file is the priority. Lossless AUDIO targets (WAV, FLAC) ignore the bitrate setting and keep every sample.
Will going from FLV to AUDIO reduce my audio quality?
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If the AUDIO format is lossless (WAV, FLAC, ALAC), every original sample is preserved. If AUDIO is lossy (MP3, AAC, OGG, Opus), the codec recompresses — at 192 kbps the difference is inaudible for most content; at 96 kbps you may hear cymbals or sibilants softening. The FLV container has no influence on this — only the codec settings matter.
Does the extracted AUDIO keep the FLV sample rate?
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By default yes — 48 kHz FLV audio becomes 48 kHz AUDIO, 44.1 kHz becomes 44.1 kHz. If you need to downsample for compatibility (e.g. 96 kHz studio masters to 44.1 kHz CD-quality AUDIO) the sample-rate dropdown does this with high-quality resampling.
Can I batch-extract AUDIO from a folder of FLV files?
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Yes — drop a folder of FLV files into the upload zone and we run extraction in parallel. Premium gets more parallel workers; on a 100-file batch (typical music-video collection) this is the difference between 90 seconds and 8 minutes.
How long does extracting AUDIO from a 1-hour FLV take?
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Audio demux + transcode runs much faster than video re-encoding — typically 5-15% of source duration. A 1-hour FLV -> AUDIO finishes in 3-9 minutes on the standard pipeline. If the AUDIO codec matches the source codec already in the FLV (common for AAC inside MKV / MP4), it is a pure remux and runs in seconds.
Will the AUDIO file carry title / artist / album tags?
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If the FLV file stores stream metadata (artist, title, album), we copy those fields into the AUDIO container where the format supports tags. ID3v2 (MP3), Vorbis comments (OGG, FLAC), MP4 atoms (AAC / M4A), RIFF INFO (WAV) are all written. Untagged FLV produces untagged AUDIO — use Mp3tag or Picard post-export to enrich.
Is my FLV private during audio extraction?
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Yes — same privacy model as every conversion. Source FLV and output AUDIO are processed in isolated workers and deleted within minutes. We never play, store, or share content. See /privacy/.
Why does my AUDIO have silent gaps or wrong audio?
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Almost always a stream-index mismatch — your FLV had a multi-track audio layout and we extracted the wrong stream (e.g. the silent descriptive audio track instead of the main mix). Re-run with the advanced "audio stream" option set to the right index, or pick "all streams" to extract every track as a separate AUDIO file.
