CONVERT FLV → OGV (FLV to OGV)
Fast, secure FLV to OGV conversion. No registration required.
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HOW TO CONVERT FLV → OGV
Drop the video file
Select a FLV file. We read the container and stream descriptors to plan the conversion.
FFmpeg handles the repackage
When codecs align, FFmpeg rewraps the existing streams into a OGV container — no quality loss, near-instant finish.
Retrieve the OGV
The OGV download is ready in seconds for stream-copy jobs, minutes for full transcodes.
Starting point: FLV is the Adobe Flash Video container, now deprecated but still lingering in archives. Natural next step, a OGV. A FLV to OGV conversion makes a recording portable. Video containers matter more than you might expect: players that handle OGV natively sometimes stutter or flat-out reject FLV with the same codec inside. Uploading above triggers a stream-level rewrap when possible, keeping the visible quality identical to the source. In practice FLV is the Adobe Flash Video container, now deprecated but still lingering in archives. On the other end, OGV is the video profile of the OGG container, typically wrapping Theora or VP8.
Why convert FLV to OGV
Sending FLV to someone on a non-matching operating system frequently leads to "file cannot be opened". OGV avoids that by sitting in the middle of everyone's compatibility list. The repackage runs quickly and without generational loss when codecs already align.
FLV vs OGV — Technical specifications
Side-by-side comparison of the technical details.
FLV
- MIME type
- video/x-flv
- Extensions
- .flv, .f4v
- Video codecs
- Sorenson Spark, VP6, H.264 (F4V)
- Audio codecs
- MP3, Nellymoser, AAC
- Status
- Deprecated since December 31, 2020
- MIME Type
- video/x-flv
- Extension
- .flv
- Category
- Video Files
- Full Name
- Flash Video
- Conversion Engine
- FFMPEG
OGV
- MIME type
- video/ogg
- MIME Type
- video/ogg
- Extension
- .ogv
- Category
- Video Files
- Full Name
- OGV Video
- Conversion Engine
- FFMPEG
- Container
- Ogg
- Video codec
- Theora (typical); Dirac, VP8 (rare)
- Audio codec
- Vorbis, Opus, FLAC
| Specification | FLV | OGV |
|---|---|---|
| MIME type | video/x-flv | video/ogg |
| Extensions | .flv, .f4v | — |
| Video codecs | Sorenson Spark, VP6, H.264 (F4V) | — |
| Audio codecs | MP3, Nellymoser, AAC | — |
| Status | Deprecated since December 31, 2020 | — |
| MIME Type | video/x-flv | video/ogg |
| Extension | .flv | .ogv |
| Category | Video Files | Video Files |
| Full Name | Flash Video | OGV Video |
| Conversion Engine | FFMPEG | FFMPEG |
| Container | — | Ogg |
| Video codec | — | Theora (typical); Dirac, VP8 (rare) |
| Audio codec | — | Vorbis, Opus, FLAC |
FLV vs OGV — Strengths and limitations
What each format does best, and where it falls short.
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.
OGV Strengths
- Patent-free codec (Theora) and container (Ogg).
- Mandatory for Wikipedia uploads — preserves public-domain video.
- Good for small educational clips.
- Open-source reference implementations.
Limitations
- Compression lags H.264 by ~40% at equal quality.
- Hardware decoders never adopted Theora.
- WebM (VP9/AV1) is the modern open-codec choice.
Quality & Compatibility
Resolution, frame rate and colour space are preserved end-to-end. If the OGV container does not support some FLV features (chapters, multiple subtitle tracks, DRM-protected streams), those are flattened or dropped with a warning. Hard-coded subtitles in the video frames always survive.
Tips for Best Results
- Embedded subtitle tracks convert between FLV and OGV when both containers support the same subtitle codec; otherwise burn the subtitles into the video first.
- For portrait (9:16) clips, make sure the OGV encoder preserves the correct display aspect ratio — some players default to 16:9 if SAR is ambiguous.
- Long recordings (over an hour) benefit from chapter metadata; OGV may not preserve FLV chapters — check before relying on them.
Frequently Asked Questions
Only when it has to. If the codecs inside FLV (usually H.264 or H.265 for video, AAC for audio) are accepted by OGV, 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".
Flash Video
Source 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.
OGV Video
Target formatOGV (Ogg Video) is an open video format using Theora codec in an Ogg container.
Going the other way? Convert OGV back to FLV with the same engine.
Common Use Cases
Share across platforms
Send OGV files to anyone without worrying about whether they have the right software for FLV.
Embed in documents
Drop OGV output into Word, Google Docs, PowerPoint, Notion or a website without conversion warnings.
Optimize size
OGV often produces smaller files than FLV 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.
FLV vs OGV — Typical file sizes
Approximate file sizes for common scenarios.
- 10-min YouTube 2008-era video 40-80 MB
- 45-min TV show (FLV H.264) 200-500 MB
- Short educational clip (1 min, 480p) 8-15 MB
- Wikipedia demo video 5-50 MB
Working with 4K/8K Video or Files Over 100MB?
Web browsers impose strict RAM limits on media streams. For gigabyte 4K/8K footage, GPU-accelerated NVENC transcode, or batch subtitle muxing, dedicated desktop encoders deliver zero upload delays.
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High-throughput enterprise pipeline for files up to 2,048 MB, 50-file batches, ISO PDF/A, and priority processing.
Uncapped 4K/8K multi-track transcoding with hardware NVENC, VideoToolbox, and AV1/HEVC pipelines.
10-bit color grading workflows, Apple ProRes mastering, and automated watch-folder queues.
Related comparisons
See these formats side by side to understand which fits your use case best.
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