CONVERT
MPG → FLV
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Fast, secure MPG to FLV conversion. No registration required.
MPG is the classic MPEG-1/2 video container common on VCDs and early DVDs. That is why users land on this page looking for a FLV copy. Repackaging a MPG file into FLV is one of the fastest video jobs there is. When the codecs already match the target container specification, the bytes are literally copied across — no re-encoding, no quality drop, no long wait. Upload above and watch the progress bar usually fly. Background. MPG is the classic MPEG-1/2 video container common on VCDs and early DVDs. Destination side, FLV is the Adobe Flash Video container, now deprecated but still lingering in archives.
MPEG Video (short)
Source formatMPG is a short extension for MPEG video files, commonly used for MPEG-1 and MPEG-2 video content.
Flash Video
Target formatFLV was the dominant web video format during the Flash era. While Flash is now deprecated, many legacy video files still exist in FLV format and need conversion to modern formats.
Why convert MPG to FLV
Flash Video is better supported than MPEG Video (short) across web uploads, social networks and consumer devices. Converting trades the niche advantages of MPG for broad playback and fewer "file type not supported" messages. Stream copy (when codecs match) keeps the video bit-identical to the source.
HOW TO CONVERT
MPG → FLV
Upload the MPG
Drop your MPG onto the uploader. Files up to 25 MB run on the free tier without registration; paid plans go up to 2 GB.
Stream-copy or re-encode
FFmpeg probes the codecs; if compatible, it stream-copies (no quality loss). Otherwise it transcodes at matching bitrate.
Download the FLV
Fetch the converted FLV as soon as it is ready. Both files auto-delete within two hours.
Common Use Cases
Share across platforms
Send FLV files to anyone without worrying about whether they have the right software for MPG.
Embed in documents
Drop FLV output into Word, Google Docs, PowerPoint, Notion or a website without conversion warnings.
Optimize size
FLV often produces smaller files than MPG for web, email and storage.
Archive & future-proof
Store in a widely-supported format that will still open on future operating systems without legacy plugins.
MPG vs FLV — Strengths and limitations
What each format does best, and where it falls short.
MPG Strengths
- Universal legacy support.
- Trivially rewrappable to .mp4 without re-encoding.
- Low decoding overhead.
Limitations
- Aging codec — larger files than modern alternatives.
- No HDR, no modern audio, no modern subtitles.
- Mostly legacy — not used for new production.
FLV Strengths
- Low overhead — the container is extremely compact.
- Designed for streaming — progressive download and seeking work well.
- Decoded natively by Flash Player on every OS for 20 years.
Limitations
- Flash Player is dead — no modern browser can play FLV without conversion.
- Legacy codecs (Sorenson, VP6) are poorly supported in modern tooling.
- Hardware video decoders never added FLV support.
MPG vs FLV — Technical specifications
Side-by-side comparison of the technical details.
MPG
- MIME types
- video/mpeg
- Extensions
- .mpg
- Container
- MPEG Program Stream
- Codecs
- MPEG-1 or MPEG-2 video + MP1/MP2 audio
FLV
- Extensions
- .flv, .f4v
- MIME type
- video/x-flv
- Video codecs
- Sorenson Spark, VP6, H.264 (F4V)
- Audio codecs
- MP3, Nellymoser, AAC
- Status
- Deprecated since December 31, 2020
| Specification | MPG | FLV |
|---|---|---|
| MIME types | video/mpeg | — |
| Extensions | .mpg | .flv, .f4v |
| Container | MPEG Program Stream | — |
| Codecs | MPEG-1 or MPEG-2 video + MP1/MP2 audio | — |
| MIME type | — | video/x-flv |
| Video codecs | — | Sorenson Spark, VP6, H.264 (F4V) |
| Audio codecs | — | MP3, Nellymoser, AAC |
| Status | — | Deprecated since December 31, 2020 |
MPG vs FLV — Typical file sizes
Approximate file sizes for common scenarios.
MPG
- 5-min camcorder clip (MPEG-2) 40-60 MB
- 2-hour DVD rip 4-7 GB
FLV
- 10-min YouTube 2008-era video 40-80 MB
- 45-min TV show (FLV H.264) 200-500 MB
Quality & Compatibility
Stream-copy is bit-perfect: when the codecs inside MPG match what FLV can carry, the frames are copied across without re-encoding and the output is visually identical to the source. When transcoding is required, we target CRF 20–23 H.264 — visually transparent for most content — and keep audio bitrate at 192 kbps AAC.
Tips for Best Results
- Stream-copy beats re-encoding by orders of magnitude — check if your MPG already uses FLV-compatible codecs before picking Advanced settings.
- For social uploads, 1080p at 30 fps strikes the best quality-to-size ratio; 4K is often downscaled server-side anyway.
- Keep the MPG if you plan further editing — transcoded FLV is fine for final delivery but not for intermediate edits.
Frequently Asked Questions
Only when it has to. If the codecs inside MPG (usually H.264 or H.265 for video, AAC for audio) are accepted by FLV, we stream-copy — the bytes are repackaged into the new container with zero re-encoding and no quality loss. When the source uses a codec the target does not support, we transcode at a matching bitrate to keep the visual quality close to the original.
With stream copy, expect the job to finish in seconds to tens of seconds regardless of video length — the work is mostly rewriting the container. Transcoding is slower (roughly real-time: a ten-minute clip takes about ten minutes) because every frame must be decoded and re-encoded. The progress bar shows which mode applies.
Yes. Resolution, frame rate, colour space and bit depth are preserved by default; stream copy is literally bit-identical on these parameters. If you explicitly pick a lower bitrate or a different codec in Advanced, the output is rebuilt to those settings, but the default is always "match the source".
Related comparisons
See these formats side by side to understand which fits your use case best.
Related Guides
FLV Files: Flash Video Format History, Codecs, and Conversion Guide
Complete guide to FLV (Flash Video) files — Sorenson/VP6/H.264 codecs, file structure, YouTube history, FFmpeg conversion to MP4/WebM, batch processing, and digital preservation.
Read guideMPEG / MPG Format: Complete Guide — MPEG-1, MPEG-2 and Conversion
What are MPEG and MPG files, the difference between MPEG-1 and MPEG-2, how to play them and how to convert MPEG to MP4.
Read guideSecure & Private Conversion
Your files are encrypted during transfer, processed in isolated containers, and automatically deleted within 60 minutes. We never read, share, or store your data.