Step 1: Provide your AVI 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 FLAC files.
AVI to FLAC Conversion FAQ
How do I extract just the audio track from AVI as FLAC?
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Upload the AVI file and the converter demuxes the audio stream from the AVI container, then transcodes it into FLAC. Video frames are discarded — no second video pass, no quality loss beyond what the FLAC codec itself introduces. AVI is Microsoft’s Audio Video Interleave, introduced in 1992 on top of the RIFF chunk format — one of the oldest containers still in circulation. FLAC is the Free Lossless Audio Codec, an open format from 2001 that compresses without discarding a single sample.
Does converting AVI to FLAC improve the audio quality?
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No, and it is worth being blunt: nothing can. The AVI already discarded detail during its original encode, and wrapping what remains in a lossless FLAC preserves exactly that — no more. The file gets several times larger and sounds identical. It is still the right move before editing, because FLAC will not add a second generation of artefacts when you export. FLAC gives you WAV fidelity at half the size, with proper metadata tags and embedded artwork, which is why it dominates lossless music libraries. AVI has no native support for modern codecs, variable frame rate, soft subtitles or files over 4 GB without hacks, and its per-chunk overhead bloats the file.
Can I tag the FLAC with artist and album information?
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Yes, and it is a genuine gain over AVI, which has nowhere dependable to store any of it. FLAC 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.
Which audio track gets extracted when my AVI has several?
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One track, picked automatically: normally the main one, the track with the most channels. This page has no setting to choose a different track and does not list the tracks in the file. If you need commentary or a dub instead, remux the AVI with that track first (VLC or ffmpeg can do this) and convert it again.
What bitrate does the FLAC file use?
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A lossy FLAC is encoded at 192 kbps by default. The Audio Quality setting also offers 320 kbps for the best quality and 128 kbps for a smaller file. A lossless FLAC (WAV, FLAC) ignores the bitrate and keeps every sample. FLAC uses linear prediction plus Rice coding to reach roughly 50-60% of the original size while decoding back to bit-identical PCM.
Will going from AVI to FLAC reduce my audio quality?
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If the FLAC format is lossless (WAV, FLAC, ALAC), every original sample is preserved. If FLAC 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 AVI container has no influence on this — only the codec settings matter.
Does the extracted FLAC keep the AVI sample rate?
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By default yes — 48 kHz AVI audio becomes 48 kHz FLAC 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 FLAC) the sample-rate dropdown does this with high-quality resampling.
Can I batch-extract FLAC audio from a folder of AVI files?
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Several files in one job need a paid plan. Free use is one file per conversion, one conversion an hour. On a paid plan you can add several files to one job, then download each result on its own or all of them in one ZIP.
How long does extracting FLAC from a 1-hour AVI take?
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It depends on the size and length of the file. Small documents and images are usually ready quickly. Long videos take the longest, because most video conversions re-encode every frame.
Is my AVI private during audio extraction?
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Yes. Uploaded AVI files are processed on our own conversion servers, no person reviews them, and they are never shared. The upload and the converted FLAC are both deleted automatically about 24 hours after the conversion, which leaves time to download the result. See /privacy/ for the full policy.
Why does my FLAC have silent gaps or wrong audio?
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Usually the AVI carries more than one audio track and the one that was converted is silent or secondary. The converter picks one audio track automatically, normally the main one, and this page has no setting to choose a different track. If the wrong one comes out, remux the AVI with the track you want first (VLC or ffmpeg can do this) and convert it again.
