How to Convert FLV to MP4 - A Complete Guide

Dec 21, 2023 | By Deepak Singh Bisht

In the world of videos, there are many different formats, and FLV is one of them. It's really popular for videos online because it keeps good quality without taking up too much space. But sometimes, FLV doesn't work well on all devices or video players. That's why you might need to convert FLV to MP4 format.

Don't worry if this sounds complicated! This post aims to simplify this process, outlining three user-friendly methods to convert FLV to MP4. Just follow these steps, and you'll have your videos ready to go in a format that works everywhere!

Understanding FLV and MP4 Formats

FLV (Flash Video Format)

Usage: FLV, short for Flash Video, has been a prominent format in the online video streaming world. Sites like YouTube and Hulu have often utilized FLV to embed media directly onto their platforms.

How it works: FLV is known for its ability to compress video files significantly while maintaining a high level of video quality. This makes it ideal for streaming content over the internet where bandwidth and file size can be constraints.

Technical aspects: The format uses Adobe Flash Player or Adobe Air to transmit video/audio over the internet. This used to be the standard for many online platforms due to its compact file size and decent quality output.

Limitations: With the gradual phasing out of Adobe Flash Player, FLV's compatibility has become more limited, especially in modern web environments and on various mobile devices.

MP4 (MPEG-4 Part 14)

Versatility and use: MP4, standing for MPEG-4 Part 14, isn't just a video format; it's a multimedia container. This means it can store video, audio, subtitles, and still images, making it incredibly versatile for various types of digital content.

Quality and compatibility: MP4 is renowned for its ability to deliver high-quality video and audio outputs. Its real strength lies in its wide compatibility with numerous media players, editing software, and devices, from smartphones to smart TVs.

Compression advantage: MP4 uses advanced compression techniques, allowing it to maintain high-quality video and audio while reducing the file size significantly. This makes it ideal for both online streaming and storage on devices with limited space.

Editing and accessibility: An added benefit of MP4 files is their ease of editing and accessibility. They can be easily edited using most video editing software and are supported by virtually all video playback systems, making them a preferred format for content creators and consumers alike.

Why convert FLV to MP4?

Converting FLV (Flash Video File) to MP4 (MPEG-4 Part 14) can be advantageous for several reasons, enhancing the versatility and usability of your video files:

Widespread compatibility

  1. Universal playback: MP4's biggest advantage is its universal compatibility. Unlike FLV, which may require specific software like Adobe Flash Player, MP4 files can be played on almost any device or media player, from smartphones and tablets to desktop computers and smart TVs.
  2. Cross-platform use: Whether you're using Windows, macOS, iOS, Android, or even Linux-based systems, MP4 files work seamlessly across these platforms without the need for additional codecs or players.

Enhanced quality and compression

  1. High-quality video and audio: MP4s are known for their excellent video and audio quality. They maintain a high standard of clarity and sound, making them suitable for both professional and personal use.
  2. Efficient file size: Despite the high quality, MP4 files are compressed effectively, meaning they take up less storage space. This is crucial for conserving space on devices and for sharing videos online.

Ease of editing and processing

  1. Edit-friendly format: MP4 files are widely supported by various video editing software, making them easy to cut, trim, merge, or modify without losing quality.
  2. Post-production versatility: Whether you're adding effects, subtitles, or transitioning between scenes, MP4 files handle these changes more efficiently than FLV files.

Improved accessibility and sharing

  1. Easier to share: The smaller file size and broad compatibility make MP4s easier to share via email, social media, or cloud storage.
  2. Accessibility features: MP4 supports subtitles and closed captions, a vital feature for creating accessible video content.

Forward compatibility

  1. Future-proof: As digital technology evolves, MP4 remains a widely accepted and future-proof format, ensuring your videos remain accessible and viewable in the years to come.
  2. FLV's declining support: With the diminishing support for Adobe Flash Player, FLV files are becoming less practical, driving the need for a more sustainable format like MP4.

In summary, converting from FLV to MP4 is a strategic move to enhance your video's compatibility, quality, and usability. Whether you're a content creator looking to share videos widely or a casual user wanting to watch videos on various devices, MP4 files offer the flexibility and quality that meet diverse needs.

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How to convert FLV to MP4?

Converting FLV files to MP4 is a straightforward process, and there are several ways to do it. In this post, we'll walk you through three common methods to convert FLV to MP4 format - using VLC Media Player, an online video converter service, and third-party SysCurve FLV to MP4 converter.

Method 1: Convert FLV to MP4 using VLC Media Player

VLC Media Player is a free and open-source media player that supports a variety of audio and video formats, including both FLV and MP4. Besides being a media player, VLC also has some powerful and user-friendly conversion capabilities. Here's how you can use it to convert FLV to MP4:

  1. Open VLC Media Player
  2. Go to the Media tab and select the Convert / Save option
  3. From the Open Media screen, click on the Add button and select the FLV file which you want to convert
  4. Select Video file and click on the Convert / Save button
  5. From the convert windows, go to the profile and select MP4 from the dropdown list
  6. Click on the Start button to start FLV to MP4 conversion.

Method 2: Convert FLV to MP4 Online

Using online converters is a handy way to convert FLV files to MP4, especially if you don't want to download any software. However, keep in mind that using these services can have security risks, especially if your video is private or sensitive. Always make sure you trust the website before uploading your files. To perform this method, follow the steps below:

  1. Go to the
  2. Click on the Select File button
  3. Choose the FLV video file you want to convert and click on the Open button
  4. Click on the Convert button. The website will start the FLV to MP4 conversion.
  5. Once the conversion is done, you'll get a link to download your new MP4 file.
  6. Click on the link to download the file to your computer.

Using online converters is really fast and simple. But be careful about what videos you upload, because these converters send your files over the internet. This might not be safe for private or important videos.

Method 3: Convert FLV to MP4 using FLV to MP4 Converter

For a more reliable and efficient way to convert FLV files to MP4, consider using the SysCurve Video Converter tool. This software offers a straightforward solution with additional features that might not be available in other methods. Here's how you can use it:

  1. Download and install the SysCurve Video Converter tool.
  2. Launch the software and click on the Add file option.
  3. Select the FLV file you want to convert and select it.
  4. Look for the 'Output Format' option in the software.
  5. Click on it and choose 'MP4' from the dropdown list of formats. Here, you can also pick the video resolution that suits your needs.
  6. After selecting, click on the 'Okay' button to confirm your choice.
  7. Click on the 'Convert' button to start converting FLV to MP4 format.
  8. Pick a location on your computer where you want the file saved.
  9. Finally, click the 'OK' button to begin the FLV to MP4 conversion process.

Using the SysCurve Video Converter tool is recommended for its ease of use and additional functionalities. It provides a more controlled environment for conversion, better handling of large files, and often better quality output compared to online converters or basic media players. This makes it a great choice if you frequently need to convert video files.

Other helpful features

  1. Supports conversion between numerous video formats, including MP4, FLV, AVI, and MKV.
  2. Also capable of converting between various popular audio formats, such as MP3, M4A, WAV, FLAC, and WMA.
  3. Provides editing tools to merge, trim, and crop audio and video files.
  4. Preview option allows users to view selected files before converting.
  5. Capability to merge an audio track into a video.
  6. Add subtitles to videos for improved accessibility.
  7. Free demo version allows users to save one-third of the video.
  8. Compatible with Windows operating systems.

Frequently Asked Questions

What are the key differences between FLV and MP4 files?

FLV files are optimized for online streaming with compact file sizes but have limited compatibility. MP4 files, on the other hand, offer wider compatibility across devices and platforms, making them more versatile for various uses.

Why is MP4 preferred over FLV for most users?

MP4 is preferred due to its universal playback across different devices and systems, efficient compression without significant loss in quality, and its versatility in handling not just video and audio, but also subtitles and images.

Can VLC Media Player convert large FLV files to MP4 without losing quality?

Yes, VLC can convert large FLV files to MP4 while maintaining the quality. However, the conversion time may increase with the size of the file.

Are online FLV to MP4 converters safe to use?

While convenient, online converters pose risks, especially for private or sensitive videos, as your files are uploaded to a server. It's important to use trusted websites and avoid converting confidential content.

Why is SysCurve Video Converter recommended for FLV to MP4 conversion?

SysCurve Video Converter is recommended for its user-friendly interface, additional features like format versatility and editing tools, and its ability to handle large files efficiently, making it suitable for both casual and professional use.

How do I ensure the converted MP4 file maintains its quality?

To maintain quality, choose a converter that allows you to customize the output settings like resolution and bitrate, and avoid excessive compression.

How can I optimize the file size of an MP4 video after conversion?

You can optimize the file size by adjusting the resolution, bitrate, and compression settings during the conversion process. Lowering these settings can reduce file size, but be mindful of the potential impact on video quality.

The Final Word

In this guide, we've explored three effective methods to convert FLV to MP4: the versatile VLC Media Player, convenient online converters, and the feature-rich SysCurve FLV to MP4 Converter. Each option offers unique benefits. VLC is a free, manual solution perfect for those who prefer a hands-on approach. Online converters provide a quick and easy solution without any software installation, but it's important to be cautious with sensitive videos. For those seeking a more robust and reliable conversion, particularly for large-scale projects, the SysCurve Video Converter tool stands out with its advanced features and ease of use.

Ultimately, converting FLV to MP4 enhances your media's flexibility, making it easier to play and share across various devices and platforms. We hope this guide empowers you to effortlessly manage your FLV to MP4 conversions, ensuring a smoother, more enjoyable video experience.

The Author

Deepak Singh Bisht

Deepak Singh Bisht

Content Lead |

Deepak Singh Bisht is a dedicated IT professional with over 9 years of experience, is a key member at SysCurve Software for the last 5 years. His expertise lies in email migration and data recovery, with a focus on technologies like MS Outlook and Office 365. Deepak, who also delves into front-end technology and software development, holds a Bachelor's degree in Computer Applications.

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