Step 1: Supply your AVI files using the button above or by haul and lay.
Step 2: Click the 'Convert' button to start the conversion.
Step 3: Get your converted FLV files.
AVI to FLV Conversion FAQ
What does the AVI to FLV converter do?
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It transcodes a AVI video into the FLV container. Resolution, frame rate, and aspect ratio are preserved by default — useful when you need a different format for a target player without quality loss.
Will resolution and frame rate be preserved in the FLV?
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Yes. AVI → FLV keeps resolution, frame rate, and aspect ratio unchanged by default. To change them, use the Resize or Speed tool on the result.
Will the AVI play smoothly on modern devices after converting to FLV?
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Yes. Legacy AVI files often fail to play in modern browsers and on iOS / Android. FLV uses widely supported codecs that play natively on phones, tablets, smart TVs, and every modern browser.
Will the converted FLV be a different size than the AVI?
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Modern codecs compress better, so FLV from a legacy AVI is typically 30-60% smaller at equivalent quality. Conversions in the opposite direction can grow the file.
My AVI footage shows comb lines on movement — will that carry into the FLV?
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It will unless you deinterlace, and AVI content very often is interlaced because the format comes from the broadcast and DVD era. Interlaced frames store two half-height fields captured a fiftieth of a second apart; on a progressive-scan phone or monitor that reads as horizontal combing on anything that moves. Turn on the deinterlace option and the encoder weaves the fields into whole progressive frames before writing the FLV. 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.
My AVI recordings are split into numbered parts — does FLV have the same limit?
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No, and that is one of the better reasons to move. The AVI container has a practical single-file ceiling that long or high-bitrate recordings run straight into, which is exactly why old captures arrive as part1, part2, part3. FLV has no equivalent limit, so the pieces can be rejoined into one continuous file. 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.
My AVI has several audio tracks — do they all survive into the FLV?
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Not dependably. AVI stores multiple audio streams as first-class tracks, but FLV playback support past the first track is inconsistent, so most players will only ever expose one. Choose the track you actually want before converting; the others are better extracted to their own files than left in a container that hides them. AVI is trivially simple, which is exactly why ancient camcorders, capture cards, DVD ripping tools and Windows-era software all still emit it. No current browser, phone or TV can play FLV — anything still in this container has to be moved out of it to remain watchable.
These AVI files came off an old camcorder — is anything special needed?
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Two things, both worth setting before you start. Tape-era cameras recorded interlaced fields and at a frame rate tied to the mains frequency where the camera was sold, so leaving deinterlacing off bakes comb lines into the FLV permanently, and letting the converter guess the rate can introduce a subtle judder on panning shots. Set both explicitly and the transfer is otherwise clean — the picture is what the tape held, which is the ceiling regardless of what it is converted into.
Is there any point converting between two legacy formats like AVI and FLV?
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Only if a specific piece of equipment demands the target. Both formats come from the same pre-H.264 era, so neither conversion buys efficiency, quality or future-proofing — it buys compatibility with one particular device. If the goal is to keep the footage usable long-term, convert to a current container instead of sideways.
Is there a file-size limit when converting AVI to FLV?
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Anonymous uploads are capped at a generous default; signed-in free accounts get a higher cap, and Pro accounts have no per-file limit. Browser memory is usually the practical constraint long before our server-side limits kick in.
Can I batch-convert several AVI files to FLV at once?
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Yes. Drop or pick multiple AVI files in one upload — the converter processes them in parallel and returns a ZIP of the FLV results. There is no need to repeat the upload step per file.
What happens to my AVI files after the conversion?
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Uploaded files and FLV outputs are auto-deleted after a short retention window. We do not inspect, share, or train on user files. Direct download links are time-limited and tied to your session.
