How do I extract the audio from a FLV file as MP3?
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Upload the FLV file and we demux the audio track, then transcode it to MP3. There is no second video pass and no quality loss beyond what the MP3 codec itself introduces.
What audio bitrate does the MP3 file use?
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Default MP3 bitrate is 192 kbps (transparent for music). You can override to 320 kbps (audiophile) or 96-128 kbps (voice / podcast / smaller file). The choice is exposed in the advanced options before extraction.
Will I lose audio quality going from FLV to MP3?
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If MP3 is lossless (WAV, FLAC), every sample is preserved exactly. If MP3 is lossy (MP3, AAC, OGG, Opus), the MP3 codec recompresses — at 192 kbps this is transparent for almost all content. Recovering quality that was already gone in the FLV source is impossible.
Does the extracted MP3 keep the original sample rate?
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By default yes — a 48 kHz audio track in FLV becomes 48 kHz in MP3. If you need 44.1 kHz (CD-quality) for compatibility with older players, the advanced options expose a sample-rate dropdown that resamples with a high-quality filter.
Can I extract audio from multiple FLV files to MP3 in one batch?
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Yes — drop a folder of FLV files in and we extract audio in parallel. Pro users get more parallel workers; on a 50-file batch this is the difference between 90 seconds and 8 minutes.
Will the MP3 file be tagged with title / artist / album?
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If the FLV container has chapter or stream metadata, we copy artist / title / album fields into the MP3 container where the MP3 format supports tags. Otherwise the MP3 file is untagged — use a tag editor (Mp3tag, Picard) post-export for richer tags.
How long does extracting MP3 from a FLV file take?
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Audio extraction is much faster than video re-encoding — typically 5-15% of source duration. A 1-hour FLV -> MP3 finishes in 3-9 minutes on the standard pipeline.
Can I extract just a section of the FLV audio as MP3?
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Not in this single tool — extract the full audio as MP3 here, then use /audio-trim/ or /audio-cutter/ to clip the section. The two-step path is faster than a combined operation because we avoid re-decoding the whole file twice.
Is my FLV file private during audio extraction?
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Yes — same privacy model as every conversion: isolated workers, automatic deletion within minutes, no human review of content. See /privacy/.
Why does my MP3 file have silent gaps?
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Silent gaps usually mean the FLV file had a multi-track audio layout and we picked the wrong stream. Use the "audio stream" option to explicitly pick stream 0, 1, etc., or re-mux all streams to a multi-track MP3 container where MP3 supports it.
Can the MP3 extraction be stereo / mono / 5.1?
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Channel layout is preserved from FLV by default — a 5.1 FLV produces a 5.1 MP3 where the codec supports it (AAC, FLAC, OGG, Opus). You can force stereo or mono via the channel-downmix option, which is useful for podcast workflow.
Does the extracted MP3 play on iPhone / Android / car stereo?
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MP3 plays everywhere. AAC / M4A plays on Apple and most Android. OGG / Opus needs a recent player on iOS. Advanced options expose a "device" preset that picks the MP3 codec most likely to play on your target.