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Edited by Ben Jacklin

November 26, 2021

The FLV format was designed to play videos on the web. Files in this format can be played in Adobe® Flash® Player. However, Adobe® has ended the support for this player since December 31, 2020. So, if you have a file in FLV, convert it to MP4 – a popular and widely-supported format. Don’t know how to change FLV to MP4? You can convert your files using an FLV-to-MP4 converter online – try the tool at the top of this page. To convert large files, use desktop conversion software.

In this article, you’ll learn how to convert from FLV to MP4 using Movavi Video Converter. You’ll also find an FLV vs. MP4 comparison and answers to frequently asked questions.

How to convert FLV to MP4 on Windows and Mac with Movavi

With Movavi Video Converter, you can convert FLV to MP4 in just a few clicks! The app supports over 180 media formats and can work with video, audio, and images. Movavi’s FLV file converter can handle batch conversion, so you can convert multiple files simultaneously. The conversion speed is higher than in free FLV-to-MP4 converters that work online. The program lets you not only change FLV to MP4 but also edit and compress your files.

Changing file formats is easy with Movavi’s FLV-to-MP4 converter: download the app, import your files, set the output format, and launch the conversion. You can use this FLV-to-MP4 converter for free during a 7-day trial period.

Follow the simple steps below to learn how to convert FLV to MP4.

Step 1. Install the FLV-to-MP4 converter on your computer

Download the FLV-to-MP4 converter for Windows or Mac and run the installation file. Follow the instructions on the screen to install the program.

Step 2. Add the video files you want to convert

To add video files for conversion, click the Add Media button in the upper left corner of the interface, then choose Add Video, and select the files you want to convert from FLV to MP4.

Step 3. Set MP4 as the output format

Click the Video tab. Choose the MP4 preset group, then the appropriate preset. If you want to transform FLV into MP4 for compatibility with your mobile device, click the Devices tab and then locate your device model.

Step 4. Compress the FLV files (optional)

You can reduce the size of particularly large files by using the converter. Click the file size value in the description section. In the box that opens, select the desired quality, bitrate, and size values. Click the Convert sample button to convert a small fragment of your file and check out the quality.

Step 5. Edit the uploaded files (optional)

Before you convert your Flash® videos to MP4, you can make changes in the files you’ve added via the built-in editing tool. To access it, click the Edit button in the file description.

Choose Audio to reduce background noise or otherwise alter the sound volume in the files. Open the tab Adjustments to change the parameters of brightness, saturation, contrast, and others. Choose from a library of creative filters in the Effects tab and apply them to your clips. In the tabs Subtitles and Watermark, you can insert upload subtitles or add a watermark, respectively. Choose either Trim or Crop to get rid of unwanted details, cut away the edges of your videos, or rotate the footage.

Step 6. Convert your Flash® video to MP4

Converted files are saved to the “Movavi Library” folder by default. To change the output folder, click Save to. To convert your FLV file to MP4, hit the Convert button.

Step 7. Upload video to your mobile device (optional)

The folder with converted files will automatically open as soon as the conversion is finished. Now you can transfer the converted files to your mobile device. Turn on the device and attach it to your computer. Launch the uploading software on your device and follow the instructions or, depending on the device, transfer files to the target folder.

Great! Now you know how to change an FLV file to MP4. To sum it up, when you have a small file, it’s easier to convert FLV to MP4 online. If you have large files and want to do some editing, you’ll need a desktop file converter from FLV to MP4.

FLV vs. MP4 comparison

FLV and MP4 are both video formats used for storing and streaming videos. The main difference between MP4 and FLV is that they are used for different purposes. FLV is a common format for video streaming and is used by websites like YouTube. On the other hand, MP4 is widely used by mobile devices like smartphones, media players, and the like. Additional MP4 vs. FLV comparisons are in the table below.

Comparison parameter

FLV

MP4

File extension.flv, .f4v, .f4p, others.mp4
Video-coding formatsSorenson, VP6, Screen Video, H.264/MPEG-4 AVCH.264, H.265, MPEG‑4, others
Audio-coding formatsMP3, Nellymoser, ADPCM, LPCM, AAC, SpeexMP3, AAC, AC‑3, others
Device and OS compatibilityRequires additional codecs to be installed on PC and Mac, no native support for mobile devicesCompatible with almost all devices and operating systems

Frequently asked questions

Which is better: FLV or MP4?

FLV is appropriate for uploading and playing videos on the web. But FLV files can’t be played on PCs without additional codecs and are not supported on some mobile devices. So if you want to watch a video on your device, MP4 is a good choice since it’s a universal format supported by almost every player.

How do I convert FLV to MP4 using Windows Media Player?

Windows Media Player doesn’t have a conversion feature.

How do I convert FLV to MP4 with OBS?

  1. Go to File and click Remux Recordings.
  2. In the OBS Recordings column, click the three dots and select your FLV file.
  3. Hit Remux.

How do I convert FLV to MP4 on a Mac?

To change file formats on your Mac, use Movavi Video Converter.

  1. Download and install the program.
    Download Movavi Video Converter
  2. Launch the program and hit Add Media > Add Video. Select a file.
  3. Open the Video tab and select the desired preset from the MP4 group.
  4. Click Convert.

How do I convert FLV to MP4 with VLC?

Here’s how to change FLV to MP4 in VLC:

  1. Go to Media and pick Convert/Save.
  2. Click Add and select the file for conversion. Hit Convert/Save.
  3. In the profile field, select Video – H/264 + MP3 (MP4).
  4. Click Browse and indicate the folder for export. Enter the file name with “.mp4” at the end.
  5. Hit Start.

How do I convert FLV to MP4 with FFmpeg?

  1. Put your FLV files in the same folder where you store FFmpeg. Then, hold the Shift key and right-click inside the folder.
  2. Select Open command or Open PowerShell window here. A command prompt will appear on the screen.
  3. Enter the following command with an appropriate file name:
    ffmpeg -i filename.flv newfilename.mp4