As a video fan, you might store many funny video files on your Mac computer and you would like to share them with your YouTube followers online. However, YouTube only accepts video files in some certain video formats like FLV. What shall we do if we want to upload AVI files to YouTube for sharing with others? The solution is simple. We need to convert AVI files to FLV format before we can upload them to YouTube. Here we will present five effective ways to convert AVI files to FLV format on Mac with AVI to FLV converter. Here we focus on Mac computer, and if you are a Windows user, you can convert AVI to FLV on Windows.

Part 1: Convert AVI Files to FLV Format on Mac with Leawo Video Converter for Mac

To convert AVI to FLV on Mac, you need to use a professional Mac AVI to FLV converter. Leawo Video Converter for Mac is highly recommended. Leawo Video Converter for Mac provides plenty of media solutions to help you watch movies anytime anywhere as you like. It includes an AVI to FLV converter for Mac users to free convert AVI files to FLV format in only a few clicks. If you need, you could even adjust the parameters of output FLV files like video codec, bit rate, quality, etc. Equipped with an easy-to-use interface, this professional video converter does not require any technical expertise and powered by leading-edge coding technology, this video converter is able to convert a video at 6 times faster speed. Besides video input and output, this converter also supports audio input and output and even allows you to convert video files to audio files. In other words, you can make use of Leawo Video Converter for Mac to extract audio files from video files. As claimed on Leawo official site, Leawo Video Converter for Mac supports up to 180 formats including  Common Video (MP4, H.265 MP4, MKV, H.265 MKV, MOV, etc.), Common Audio (AAC, AC3, WAV, MP3, WMA, FLAC, etc.), HD Video (HD MP4, HD AVI, HD TS, HD VOB, etc.), and 4K Video (4K MP4 and 4K MKV). 

Leawo Video Converter for Mac is equipped with an internal video editor and player for you to edit video files, including video trimming, adding watermark, video cropping, adding video effect, turning 2D video to 3D, and removing video noise. At the same time, the internal video player allows you to play video files after video importing.

Download and install Leawo Video Converter for Mac on your computer, and follow the guide below to convert AVI to FLV on Mac.

Step 1. Import Source AVI Files
Launch Leawo Video Converter, go to the “Convert” tab, and click the “Add Video” button on the sub-menu to load your source AVI files. Alternatively, you can directly drag and drop AVI files into the program interface. After AVI files are imported, you could playback source video files, select subtitles and audio tracks from source AVI files, add external subtitles to loaded video files, edit loaded video files, etc.


Step 2. Set FLV as Output Format
Click the drop-down box named “MP4 Video” by default next to the “Add Photo” button. On the drop-down list, select the “Change” option. Then on the popup Profile window, select “FLV” from the “Format” column as output format.


Note: If you need, you could click the “Edit” button on the drop-down profile setting box to adjust video and audio parameters like video codec, aspect ratio, frame rate, resolution, audio codec, bit rate, channel, sample rate, etc.

Step 3. Convert AVI to FLV
Click the big green “Convert” button on the sub-menu bar next to the format setting drop-down box. Then, on the popup sidebar, set the output directory. After setting an output directory, click the “Convert” button right below. Leawo Video Converter for Mac would start to convert AVI to FLV immediately.


Part 2: Convert AVI Files to FLV Format on Mac with Any Video Converter for Mac

Any Video Converter Free for Mac is an all-in-one and powerful tool for converting any video files to popular video formats with fast speed and excellent quality. It is a simple, all-round video converter. It supports high-speed and quality-lossless conversion, allowing conversion in several video formats, and it can convert videos including DivX, XviD, MOV, RM, RMVB, MPEG, VOB, DVD, WMV, AVI to MPEG-4 format into your iPod, PSP, MP4, mobile phone or other video playback tools. Therefore, we can make good use of Any Video Converter for Mac to convert AVI files to FLV on Mac. Check out the guide below.

Step 1. Download and Install Any Video Converter for Mac
It takes only a few minutes to download and install Any Video Converter for Mac.

Step 2. Add Videos for Conversion
Launch the program you just installed. You can drag the AVI file directly into the converter, or click the "Add Files(s)" button at the bottom left to browse and select the targeted AVI video file on your Mac computer.

Step 3. Choose FLV as Output Format
After importing the AVI video file, you need to click the drop-down box under Profile, then select "FLV" as output format. The format of the output is set.

Step 4. Convert and Enjoy FLV File
After all the parameters are set, click "Convert Now" to convert AVI to FLV, and wait a few minutes, you can get FLV video format.


Part 3: Convert AVI Files to FLV Format on Mac with Aconvert

The third method to convert AVI to FLV is to operate online with the help of Aconvert. The letter “A” in the name of Aconvert means “All”, which means Aconvert supports and converts all kinds of documents, ebook, image, icon, video, audio and archive files online for free. Therefore, we can use Aconvert to convert AVI video online free of charge, and it supports FLV output. It is easy to operate with Aconvert to convert AVI video to FLV video.

Step 1. Import AVI Files into Aconvert
Visit the official website of Aconvert, and choose “Video” on the left to enter the Aconvert video converting interface. First, we need to import AVI file by clicking “Choose File”.

Step 2. Choose Output Format
After importing AVI video file, we can choose a variety of formats as output. To convert AVI to FLV, you need to choose FLV format under “Target format”.

Step 3. Start Conversion Process
Click “Convert Now!” after output format is set. After a few seconds of transmission, the conversion will be complete. After conversion process is complete, you can download the converted result on your computer.


Part 4: Convert AVI Files to FLV Format on Mac with FreeFileConvert

Besides Aconvert, we can try FreeFileConvert, a free online video converter. FreeFileConvert supports 8372 different conversion combinations including audio, video, image, document, archive, presentation, ebook and font file types. However, it doesn’t support a file larger than 300MB. The process of converting AVI to FLV with FreeFileConvert is much the same as that with Aconvert. Now, let’s begin converting AVI to FLV with FreeFileConvert.

Step 1. Import AVI File
Click “Choose File” to choose and import AVI file from your computer.

Step 2. Set FLV as Output Video Format
After AVI file is imported, choose “Convert Files to” and then choose “FLV” as output format.

Step 3. Start to Convert AVI to FLV
After the output format is selected, click the blue “Convert” button to convert AVI to FLV.


Part 5: Convert AVI Files to FLV Format on Mac with QuickTime

QuickTime is the built-in video player of Mac system that multitasks and performs an array of other functions as well including video conversion. While using QuickTime, there is no need of downloading any software or program as it comes bundled with the system. The process of video conversion is simple and quick using this free Mac video converter. Check out the guide below to convert AVI files to FLV format on Mac with QuickTime.

Step 1. Open Source AVI Video File
QuickTime does not support batch conversion. Therefore, if you have multiple files, you need to convert them one by one. Locate your source AVI video file, open it in QuickTime.

Step 2. Export File as FLV
On the interface of QuickTime, you need to click “File”, then “Export”, and “Export As FLV”. You can rename the video file, and at the same time, you can choose a resolution for keeping in the output FLV video file.

Step 3. Start to Export
Click the blue “Export” button to start to export AVI as an FLV video. After you get an FLV video, you can upload it to YouTube for sharing.