Do I need to upload my video file?

No. This tool only generates the FFmpeg command. Your video file never leaves your computer — you run the command locally in your terminal.

Which video codec should I choose?

H.264 (libx264) produces the best quality-to-file-size ratio and is widely supported. VP6 (flv) is the original Flash codec and is compatible with very old Flash players.

What bitrate should I use?

For standard definition (480p), 800–1500 kbps is typical. For higher quality, use 2000–4000 kbps. Lower bitrates reduce file size but also reduce quality.

How do I install FFmpeg?

On macOS, run "brew install ffmpeg". On Ubuntu/Debian, run "sudo apt install ffmpeg". On Windows, download a build from ffmpeg.org and add it to your PATH.

Can I convert multiple files at once?

Yes — the tool also generates a shell loop command that converts every .avi file in the current folder. Toggle "Batch mode" to see it.

What does the -movflags +faststart flag do?

It moves the metadata to the beginning of the file so that streaming players can start playback before the file has fully downloaded.

AVI to FLV Converter

Name: AVI to FLV Converter
Availability: InStock
Author: Nham Vu

Get the exact FFmpeg command to convert any AVI file to FLV format, with options for codec, bitrate, frame rate, and audio settings.

Conversion Settings

Input filename

Output filename

Video codec

H.264 (libx264) VP6 (flv)

Video bitrate: 1200 kbps

200 kbps5000 kbps

Audio codec

AAC MP3

Audio bitrate: 128 kbps

Frame rate

Resolution scaling

Batch mode (all .avi in folder)

FFmpeg Command

Click "Generate Command" to build your FFmpeg command.

Flag Reference

-i

Input file path

-c:v

Video codec (libx264 = H.264, flv = VP6)

-b:v

Video bitrate (e.g. 1200k)

-c:a

Audio codec (aac or libmp3lame)

-b:a

Audio bitrate (e.g. 128k)

-r

Frame rate override (e.g. 30)

-vf scale

Scale width; -2 keeps aspect ratio

-movflags

+faststart: moves metadata to start for streaming

Install FFmpeg

macOS brew install ffmpeg

Ubuntu sudo apt install ffmpeg

Windows winget install FFmpeg

Copied!

Summary

Get the exact FFmpeg command to convert any AVI file to FLV format, with options for codec, bitrate, frame rate, and audio settings.

How it works

Enter your input AVI filename and the desired output FLV filename.
Select a video codec (H.264 or VP6) and set the video bitrate.
Choose an audio codec (AAC or MP3) and set the audio bitrate.
Optionally adjust frame rate and resolution scaling.
Click "Generate Command" to build the FFmpeg command.
Copy the command and run it in your terminal where FFmpeg is installed.

Use cases

Convert AVI recordings for Flash-based video players.
Prepare video files for older web streaming platforms.
Batch convert AVI archives to compact FLV for storage.
Transcode AVI files captured by legacy cameras to web-compatible FLV.
Create FLV files for embedding in legacy HTML pages.
Learn FFmpeg flag syntax for AVI-to-FLV conversion.

Frequently Asked Questions

Last updated: 2026-06-11 · Reviewed by Nham Vu