by Christine Smith • 2020-02-24 11:28:48 • Proven solutions

FFmpeg is a great library that can help you to covert, resize, merge or combine videos easily when any other process fails. It can help you handling big files easily without breaking any sweat. If you want to merge/combine/stitch MP4 videos using FFmpeg but you don't know how to do it, then you have come to the right place. With the help of this article, you will not online learn how to join or concatenate MP4 videos in FFmpeg but also learn about the best FFmpeg alternative to merge videos easily on Windows/Mac. There is no need to panic if you think the process is complicated. You just have to follow the steps accordingly and you will have a perfect result every time.

Part 1. Steps to Concatenate MP4 Videos with FFmpeg

There are various ways to concatenate MP4 videos with FFmpeg, but we are going to provide you a simple and effective process here. So that if you are new to this, you won't feel that it's hard to follow. The process has some complicated steps and commands to enter so use this method at your own risk. Even if you think that this process is hard for you to handle, you can always use the alternative method using Wondershare UniConverter. Here is how to merge mp4 videos using FFmpeg.

But don’t worry we have got you covered. You can follow our guide below to convert MOV videos to MP4 format using Wondershare Uniconverter which is available for free. Easily convert videos from MOV to MP4 format to play on Android and Windows PC. Converting a video into a different format is really easy thanks to this tool.

Step 1: First you need to keep all the mp3 files that you want to combine in a single folder. For example, the path of my folder is:

C:UsersLinglom.comDesktop2016Y03M29D12H

Step 2: Then you need to download FFmpeg file from this address - https://ffmpeg.zeranoe.com/. Download the version suitable for your computer. For my PC I downloaded the 64-bit latest version.

Step 3: Next open Command Prompt window by right clicking on the windows icon or you can press Windows + R in your keyboard, type in cmd.exe, and then press Enter to open it.

Step 4: When the command prompt window opens, you need to type in or change the destination folder path of the mp4 files.

Step 5: Next you need to create a .txt folder that will have a list of all the mp4 files that you want to combine. You need to type in this below command and press Enter:

(for %i in (*.mp4) do @echo file '%i') > mylist.txt

You will see that a mylist.txt file is created in the mp4 folder that has a list of all the mp4 files.

Step 6: Finally you need to type in this below command to combine all the mp4 files by using FFmpeg –

ffmpeg -f concat -i mylist.txt -c copy output.mp4

As the process is just concatenating the files and not re-encoding, it should be done easily with fast speed. If no error message occurs, you will get a final combined video named output.mp4 in the MP4 folder.

Part 2. Best FFmpeg Alternative to Merge Videos Easily on Windows/Mac

The best way to merge/combine/stitch mp4 videos by using an alternative is ndershare UniConvert. If you don't know how to combine mp4 videos using FFmpeg, then you don't need to use that method. The easiest way to combine your mp4 videos is by using a powerful program like UniConverter. It has the easiest and effective interface that any user can operate. It's the best video converter that has all the ultimate features available. It can convert videos in more than 1000 format with 30 times speed and it will keep the perfect video quality every time. It has many more powerful features that will amaze you. It also has a great video editor with advanced editing features that will allow you to create professional videos.

Wondershare UniConverter - Best Video Merger for Mac/Windows

• Merge videos into one with easy steps and no quality loss on Windows/Mac.
• Edit videos with trimming, cutting, merging, adding subtitles, applying effects, etc.
• Support 1000+ video and audio formats including MP4, MOV, WMV, MKV, FLV, MP3, WAV, etc.
• 30X faster conversion speed than common converters with unique APEXTRANS technology.
• Burn and customize videos to your DVD disc with free DVD menu templates.
• Download or record videos from YouTube and other 10,000+ video sharing sites.
• Transfer videos from computer to iPhone, iPad and other devices directly and vice versa.
• Versatile toolbox: Add video metadata, GIF maker, cast video to TV, video compressor and screen recorder.
• Supported OS: Windows 10/8/7/XP/Vista, Mac OS 10.15 (Catalina), 10.14, 10.13, 10.12, 10.11, 10.10, 10.9, 10.8, 10.7, 10.6.

Steps to Merge Videos on Windows/Mac using UniConverter

Step 1 Add videos to The Program Library

Download, setup and install UniConverter program from its official website and launch the program. From the home interface, navigate to the Convert section. Click on the Add Files button and import the videos that you want to merge using the software.

Step 2 Select Output Format and Enable Merge Option

Next click on the drop down icon beside Convert all files to and get into the drop down menu. Then select Video tab to choose an output format. Choose a suitable output format and enable the Merge All Videos option from below the window.

Step 3 Combine Videos

Finally, you can click on the Convert All button from the bottom right corner of the program window and wait till the process is finished. After that you can click on the output icon to open the output folder and check the merged video.

In the end, many people don't know how to merge/combine/concatenate mp4 videos using FFmpeg, but with the help of the step by step guideline you can help yourself out easily. Also if you don't feel like using this process with so many commands and steps to follow, you can use the alternative method to merge mp4 videos without FFmpeg. After reading this article, you know that the best alternative method is by using UniConverter software. Wondershare UniConverter is the ultimate video converter that can help you out easily with many useful and effective video editing features. So without wasting your time on any other method, start using UniConverter from now on.

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

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

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. Dl2rum.

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.

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

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

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