Step-by-Step Guide on FFmpeg Convert AVI to H264 MP4

How to convert a MP4 to a AVI file? Choose the MP4 file that you want to convert. Select AVI as the the format you want to convert your MP4 file to. Click 'Convert' to convert your MP4 file. Zamzar Pro Tip: If you are on a Mac then you can use the Quicktime player which is bundled with the Mac OS to open MP4. Avi to mp4 converter mac free download - iTool AVI To iPod Converter for MAC, Mac Free Any MP4 Converter, Mac Any MP4 Converter, and many more programs. Two Ways to Convert AVI to MP4 on Windows and Mac. AVI is a highly compressed video audio format which is supported by many media players. But not all players can play AVI files. Some hot devices can't support to play AVI files, such as iPhone, iPad, iPod, PSP and many Android devices.

FFmpeg is available for Windows, Linux and Mac operating systems. Below we will show you how to free convert avi files to mp4 using FFmpeg on Windows. The steps on other platforms are basically the same.

Download FFmpeg on Computer

Go to FFmpeg official site and navigate to the download page. There are builds for three different OS in 32-bit and 64-bit. Download the version based on the operating system of your computer.

Extract FFmpeg Files

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After the package is downloaded, you will get a zip file. The zip file won't do any avi to mp4 conversion and now you need to extract FFmpeg from the folder. First download a free zip extractor named 7-Zip.

Use the extractor to extract the file, and create a new folder in C drive named FFMPEG. Copy and paste the contents of the extracted folder into the created folder in C drive.

Enable FFmpeg in Command Line

To allow us to use FFmpeg command to transcode avi format to mp4, we need to enable the tool in the command line first to allow FFmpeg avi to mp4 converter to be recognized by the system.

Click the Start Menu > right click on Computer and select Properties > click on Advanced system settings in the system windows > open Environment Variables > now click Edit button and enter ;cffmppegbin (note the semi-colon) in the Variable value field and then click OK.

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Run FFmpeg Command Tool

The FFmpeg is installed and enabled for converting avi videos to mp4 and you only need to open it and enter the command line. To open FFmpeg, click Run and type cmd and press the Enter button > Then enter cd and press Enter > enter cd FFmpeg and the tool will open > enter cd bin and press Enter > now enter ffmpeg.exe and press Enter. And this means that the tool is open and ready to convert avi to mp4 using FFmpeg command line.

Start Free FFmpeg AVI to MP4 Conversion

Now comes to the step to let FFmpeg convert avi to h264 mp4. For this purpose, simply input the command line as the picture below:
ffmpeg -i input.avi -cvodec libx264 -acodec libfaac output.mp4

More tips on converting avi videos to mp4 with FFmpeg:
To enable avi to mp4 command line in FFmpeg lossless without transcoding, enter the command line:
ffmpeg -i infile.avi -acodec copy -vcodec copy outfile.mp4

To batch convert avi files to mp4 with FFmpeg command line, enter:
for %%a in ('*.avi') do ffmpeg -i '%%a' -c:v libx264 -preset slow -crf 20 -c:a libvo_aacenc -b:a 128k 'newfiles%%~na.mp4'
pause

To compress avi video, enter the command line below:
ffmpeg -i input.avi -vcodec msmpeg4v2 -acodec copy output.avi

To adjust the output quality of free avi to mp4 conversion with ffmpeg, you can set the bit rate:
e.g.: ffmpeg -i input.avi -c:v libx264 -b:v 500K -c:a copy out.mp4

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To cut certain part of the video, using -t (output duration) and -ss (starting point) options:
e.g.: ffmpeg -ss 00:01:30 -i input.avi -c:v copy -c:a copy -t 5 output.mp4

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To resize the output mp4 for iPhone, iPad other mobiles, using -s option:
e.g.: ffmpeg -i movie.avi -c:v libx264 -s:v 854x480 -c:a copy out.mp4