Convert MPG to FLV — Free Online Converter
Convert MPEG Video (.mpg) to Flash Video (.flv) online for free. Fast, secure video conversion with no watermarks or registration....
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Upload your .mpg file by dragging it into the upload area or clicking to browse.
Choose your output settings. The default settings work great for most files.
Click Convert and download your .flv file when it's ready.
About MPG to FLV Conversion
MPG is the legacy disc and broadcast format using MPEG-1/MPEG-2 codecs, while FLV (Flash Video) was Adobe's proprietary streaming format that dominated web video from roughly 2005 to 2015. FLV supported Sorenson Spark, VP6, and eventually H.264 video with MP3 or AAC audio. While Flash Player has been discontinued since 2020, FLV files are still encountered in legacy web archives, old content management systems, and RTMP streaming infrastructure.
Why Convert MPG to FLV?
Converting MPG to FLV serves legacy scenarios where FLV format is specifically required. Older content management systems, Flash-based e-learning platforms, and RTMP streaming servers may still need FLV input. Some digital media archives also contain large FLV collections, and adding MPG content requires format consistency. While no one should start new FLV projects, maintaining existing Flash-era infrastructure sometimes necessitates this conversion.
Common Use Cases
- Adding broadcast recordings to existing FLV-based content management systems
- Feeding DVD rip content into legacy RTMP streaming servers that require FLV
- Maintaining format consistency in Flash-era digital media archives
- Converting TV capture recordings for playback in legacy corporate intranet systems
- Producing FLV files from MPG sources for Flash-based e-learning modules still in use
How It Works
FFmpeg decodes MPEG-1/2 video and MP2 audio from the MPG container, then re-encodes to H.264 (or H.263 for strict Flash 7 compatibility) with AAC or MP3 audio in the FLV container. The FLV container supports H.264+AAC since Flash Player 9 Update 3. Injecting onMetaData events ensures proper seeking in Flash-based players. Keyframe placement every 2 seconds supports RTMP stream switching.
Quality & Performance
Using H.264 inside FLV produces quality equivalent to or better than the original MPEG-2 at the same bitrate, thanks to H.264's superior compression. Using Sorenson Spark (for very old Flash compatibility) results in quality comparable to MPEG-1 — acceptable for standard definition only.
Device Compatibility
| Device | MPG | FLV |
|---|---|---|
| Windows PC | Partial | Partial |
| macOS | Partial | Partial |
| iPhone/iPad | Partial | Partial |
| Android | Partial | Partial |
| Linux | Partial | Partial |
| Web Browser | No | No |
Recommended Settings by Platform
YouTube
Resolution: 1920x1080
Bitrate: 8-12 Mbps
H.264 recommended for fast processing
Resolution: 1080x1080
Bitrate: 3.5 Mbps
Square or 9:16 for Reels
TikTok
Resolution: 1080x1920
Bitrate: 4 Mbps
9:16 vertical, under 60s ideal
Twitter/X
Resolution: 1280x720
Bitrate: 5 Mbps
Under 140s, 512MB max
Resolution: 960x540
Bitrate: 2 Mbps
16MB limit for standard, 64MB for document
Discord
Resolution: 1280x720
Bitrate: 4 Mbps
8MB free, 50MB Nitro
Tips for Best Results
- 1Use H.264+AAC inside FLV for the best quality and smallest files — only use older codecs for Flash 7/8 compatibility
- 2Inject FLV metadata (onMetaData) for proper seeking and duration display in legacy players
- 3For RTMP streaming, set keyframe interval to 2 seconds and use constant bitrate (CBR) mode
- 4Deinterlace MPG sources before encoding to FLV — interlaced content renders poorly in Flash players
- 5Consider migrating FLV archives to MP4 rather than creating new FLV content
Related Conversions
MPG to FLV conversion exists purely for legacy compatibility. For any new project, use MP4 or WebM instead. But for maintaining Flash-era infrastructure, this conversion provides reliable, correctly-formatted FLV output.