Convert 3GPP2 Multimedia (.3g2) to Flash Video (.flv) online for free. Fast, secure video conversion with no watermarks or registration.
Upload your .3g2 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.
FLV (Flash Video) was the dominant web video format during the mid-2000s, powering YouTube, Dailymotion, and virtually every web video player before HTML5 adoption. Converting 3G2 to FLV transforms old CDMA phone recordings into the Flash container format using Sorenson Spark (H.263) or VP6 video with MP3 audio. While FLV is now obsolete for web delivery — Adobe discontinued Flash Player in December 2020 — it remains relevant for archival access to legacy Flash-based media systems.
This conversion is a niche operation suited for specific legacy scenarios: maintaining compatibility with old Flash-based CMS platforms, preparing content for archived Flash video players, or converting files for systems that only accept FLV input. For any modern use case, MP4 or WebM are universally better choices.
The primary reason to convert 3G2 to FLV today is backward compatibility with legacy systems. Some enterprise intranets, archived websites, and older content management platforms still run Flash-based video players that only accept FLV input. Certain RTMP streaming workflows also expect FLV as input format.
FLV is also used as an intermediate format in some live-streaming pipelines. OBS Studio and other broadcasting tools use FLV internally for RTMP output. If you need to feed legacy phone recordings into an RTMP-based streaming workflow, FLV is the expected container format for that pipeline stage.
FFmpeg re-encodes the 3G2 video to Sorenson Spark (FLV1) or H.264 inside the FLV container. Audio is transcoded from AMR to MP3 at 128 kbps or AAC (supported in FLV since Flash Player 9). The FLV container uses a simple tag-based structure with video, audio, and metadata tags. FFmpeg adds proper onMetaData injection with duration, width, height, and keyframe index for accurate seeking.
Sorenson Spark is an older codec with lower efficiency than H.264, so FLV files tend to be larger at equivalent quality. For 3G2 source material at QCIF/CIF resolution, the quality difference is negligible since the source detail is already very limited. Using H.264 inside FLV produces better quality but requires Flash Player 9+ on the playback side.
| Device | 3G2 | FLV |
|---|---|---|
| Windows PC | Partial | Partial |
| macOS | Partial | Partial |
| iPhone/iPad | Partial | Partial |
| Android | Native | Partial |
| Linux | Partial | Partial |
| Web Browser | No |
Resolution: 1920x1080
Bitrate: 8-12 Mbps
H.264 recommended for fast processing
Resolution: 1080x1080
Bitrate: 3.5 Mbps
Square or 9:16 for Reels
Resolution: 1080x1920
Bitrate: 4 Mbps
9:16 vertical, under 60s ideal
Resolution: 1280x720
Bitrate: 5 Mbps
Under 140s, 512MB max
Resolution: 960x540
Bitrate: 2 Mbps
16MB limit for standard, 64MB for document
Resolution: 1280x720
Bitrate: 4 Mbps
Converting 3G2 to FLV is only warranted for specific legacy or streaming scenarios. For all general-purpose use, MP4 or WebM are superior alternatives that offer better codec support and universal modern playback.
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| Egenskap | 3G2 | FLV |
|---|---|---|
| Fullt navn | 3GPP2 Multimedia | Flash Video |
| Filendelse | .3g2 | .flv |
| Best egnet for | Mobile optimized | Small file size |