Can this tool actually convert FLV files to MPEG?

No — conversion requires decoding video frames, which browsers do not allow for arbitrary files. This tool estimates output file size and guides you on the best conversion software to use.

What is the difference between MPEG-1, MPEG-2, and MPEG-4?

MPEG-1 targets up to 1.5 Mbps (VCD quality). MPEG-2 targets 3–15 Mbps (DVD/broadcast). MPEG-4 Part 2 or H.264 covers modern streaming at higher quality per bit. For most conversions from FLV, MPEG-4 (H.264) is recommended.

What bitrate should I use?

For 480p video, 1–2 Mbps video bitrate is typical. For 720p, 2.5–5 Mbps. For 1080p, 5–8 Mbps. These presets are built into the estimator above.

Which software can convert FLV to MPEG?

FFmpeg is the most powerful free option (command-line). HandBrake provides a GUI. VLC can also convert using its transcode feature. All three are free and open-source.

Will the output file size match exactly?

The estimate assumes constant bitrate (CBR) encoding. Real encoders often use variable bitrate (VBR), so actual sizes may differ by 5–15%. Add a 15% buffer when planning storage.

Does the audio bitrate affect quality significantly?

For most content 128 kbps stereo AAC or MP3 is transparent. Only increase above 192 kbps for music-heavy or broadcast-quality productions.

FLV to MPEG Converter

Estimate the output file size and bitrate when converting an FLV video to MPEG format — no upload required.

Bitrate & File Size Estimator

Enter your FLV video details to estimate the MPEG output size.

Video Duration

Hours

Minutes

Seconds

Quality Preset

Video Bitrate (kbps)

Min: 100Max: 50,000

Audio Bitrate (kbps)

Estimated Output

Fill in the fields and click Calculate to see your estimate.

How to Convert FLV to MPEG

FFmpeg (Recommended — Free, All Platforms) Best Quality

Convert to MPEG-2 (DVD-compatible):

ffmpeg -i input.flv -c:v mpeg2video -b:v 5000k -c:a mp2 -b:a 192k output.mpg

Convert to MPEG-4 / H.264 (modern, smaller file):

ffmpeg -i input.flv -c:v libx264 -b:v 4000k -c:a aac -b:a 192k output.mp4

HandBrake (GUI — Windows / Mac / Linux)

Open HandBrake and click Open Source, select your FLV file.
Under Summary, set the format to MPEG-4 or MKV.
In the Video tab, choose H.264 codec and set Average Bitrate (kbps) to your target.
In the Audio tab, select AAC or MP3 and set your audio bitrate.
Click Start Encode.

VLC Media Player (Quick Convert)

In VLC, go to Media > Convert / Save.
Add your FLV file and click Convert / Save.
Select the Video - H.264 + MP3 (MP4) profile or create a custom MPEG profile.
Set the destination file and click Start.

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Summary

FLV (Flash Video) is a legacy container format once dominant for web video. Converting to MPEG gives you a widely compatible format supported by nearly every media player, smart TV, and editing suite. This tool lets you estimate the output file size and choose the right bitrate before you run your conversion software, saving you from trial-and-error re-encodes.

How it works

Enter your FLV video duration in hours, minutes, and seconds.
Set your desired video and audio bitrates (or use the presets).
The estimator instantly calculates the expected MPEG output file size.
Choose a recommended conversion method from the guide below.
Run the conversion with FFmpeg, HandBrake, or any MPEG-compatible encoder.

Use cases

Estimate storage requirements before batch-converting an archive of FLV files.
Select the right bitrate for a target file size (e.g., email or upload limits).
Compare MPEG-1 vs MPEG-2 vs MPEG-4 bitrate trade-offs before encoding.
Plan bandwidth and storage for video hosting workflows.
Determine suitable quality settings for DVD or broadcast delivery.
Plan conversion settings for legacy Flash Video archives prior to encoding.

Frequently Asked Questions

Last updated: 2026-06-11 · Reviewed by Nham Vu