Free online MPG to FLV converter
Convert MPG recordings to legacy-compatible FLV with FFmpeg or 101convert.com.
Convert MPG to FLV online - free
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How it works
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Upload your .mpg file
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Perform .mpg to .flv conversion
After successful file upload, click to convert when you are ready.
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How to convert mpg to flv file
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Legacy Flash players, video portals, and authoring systems may accept FLV files but reject MPEG video files. Converting an MPG recording to FLV makes it usable in those systems, although MP4 is usually the better choice for modern playback.
What the MPG format is
MPG is a filename extension commonly used for files containing MPEG-1 or MPEG-2 video. MPEG-1 is associated with Video CD-era footage, while MPEG-2 is common in DVDs, digital television recordings, camcorders, broadcast captures, and older editing systems. MPG files may contain MPEG-1 Layer II or MP3 audio; the exact streams depend on the software or device that created the file.
VLC, Windows Media Player, DVD-authoring software, broadcast capture tools, and older video editors commonly open MPG files. MPG is a container-style file extension rather than a guarantee of one exact video and audio configuration.
What the FLV format is
FLV (Flash Video) is a container designed for progressive web playback and Adobe Flash Player. It can contain Sorenson Spark, VP6, or H.264 video and MP3 or AAC audio. H.264 video with AAC audio is generally the most useful combination when creating an FLV file for a legacy application.
FLV was compact and suitable for progressive downloading, but it is now a legacy format. Adobe discontinued Flash Player, and current browsers do not natively play FLV. Its practical advantage today is compatibility with older Flash-based players and content-management or authoring systems that specifically require an FLV container.
How to convert MPG to FLV with FFmpeg
FFmpeg is the most controllable desktop option for Windows, macOS, and Linux. It is preferable to tools that merely rename the extension because conversion may require re-encoding both streams.
- Install FFmpeg from a trusted package source and open a terminal or Command Prompt in the folder containing the MPG file.
- Run this command, replacing the input filename as needed:
ffmpeg -i input.mpg -c:v libx264 -pix_fmt yuv420p -preset medium -crf 23 -c:a aac -b:a 128k -ar 44100 -f flv output.flvThis encodes H.264 video and AAC audio, uses the broadly compatible 4:2:0 pixel format, and writes output.flv. Lower -crf values produce higher quality and larger files; values from about 20 to 28 are practical starting points. Keep the original MPG because re-encoding introduces generation loss.
Direct stream copying avoids re-encoding but works only when every source stream and parameter is valid for FLV:
ffmpeg -i input.mpg -c copy -f flv output.flvTypical MPEG-1 or MPEG-2 MPG video is not suitable for direct copying into FLV, so the H.264/AAC command is more reliable. If the source is interlaced and the output shows comb-like motion artifacts, add the deinterlacing filter:
ffmpeg -i input.mpg -vf yadif -c:v libx264 -pix_fmt yuv420p -preset medium -crf 23 -c:a aac -b:a 128k -ar 44100 -f flv output.flvFFmpeg retains the source dimensions and frame rate unless you add scaling or frame-rate options. Check the result for interlacing, aspect-ratio changes, audio sync, and truncated footage.
Convert with a graphical application
VLC can convert files through Media → Convert/Save → Add → Convert/Save. Choose a profile that produces H.264 video and AAC or MP3 audio, set an output filename ending in .flv, and start the conversion. FLV profiles and codec controls vary by VLC version, so verify that the resulting file actually opens in the intended legacy player.
HandBrake is useful for producing modern MP4 files, but it generally does not provide FLV output in current releases and should not be presented as an FLV conversion solution. A dedicated desktop converter can work if its documented output settings include an FLV container and compatible video and audio codecs.
Convert without installing software
You can convert the file for free on 101convert.com without installing desktop software. Upload the MPG file, select FLV as the output format, start the conversion, and download the resulting file when processing finishes. Do not upload confidential or restricted footage unless the service’s handling and retention terms are acceptable.
Quality and compatibility limits
FLV playback may require VLC or another desktop player because modern browsers and operating systems generally lack native FLV support. If the receiving system accepts MP4, H.264 video with AAC audio in an MP4 container is normally more compatible and easier to play than FLV.
Changing the container alone cannot fix unsupported codecs. When the target application requires a particular FLV profile, confirm its accepted video codec, audio codec, maximum resolution, frame rate, and audio sample rate before converting.
MPG vs FLV: format comparison
How the MPG and FLV formats compare on the properties that matter most for this conversion.
| Property | .MPG MPEG video file | .FLV Flash Video |
|---|---|---|
| Format type | Both | Container |
| Compression | Lossy | Both |
| Maximum resolution | — | 4K |
| Audio tracks | One | One |
| Subtitles | — | Embedded in the file |
| Streaming | Partial | Partial |
| Opens in a web browser | Partial | Partial |
| Typical file size | Medium | Small |
| Open standard | Yes | Partly open |
| Introduced | 1992 | 2002 |
| Developer | Moving Picture Experts Group (MPEG) | Adobe Systems / Macromedia |
| MIME type | video/mpeg | video/x-flv |
Suggested software and links: mpg to flv converters
Frequently asked questions
Is the MPG to FLV converter free?
Yes, converting MPG to FLV on 101convert.com is completely free. No registration, email address or installation is required. If you need a higher file size limit or want to convert more files at once, see our plans.
How large can my MPG file be?
You can upload MPG files up to 2000 MB and convert up to 1 files at once in a single batch.
What happens to my uploaded files?
Files are processed automatically and deleted from our servers within a few minutes after conversion. We never view or share your files.
Do I need to install any software to convert MPG to FLV?
No. The MPG to FLV conversion runs entirely online in your browser and works on Windows, Mac, Linux, Android and iPhone.
Did the conversion fail?
In most cases, the cause is an incorrect file format. Please upload a valid MPG file for this MPG to FLV conversion. Occasionally, the issue may be on our side. We analyze recurring conversion failures and disable or fix the converter if we detect a defect.
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mpg file conversion
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