AVI (Audio Video Interleave) is Microsoft's classic multimedia container from 1992, still widely used in legacy Windows environments, surveillance systems, and older video editing software. Converting 3G2 to AVI transforms mobile phone recordings from the CDMA2000 container into the RIFF-based AVI format, ensuring compatibility with Windows-centric playback and editing workflows that do not support mobile video containers.

While AVI is an aging format, it remains the expected input for many industrial and enterprise video systems. Surveillance DVRs, medical imaging viewers, and legacy video editing suites like VirtualDub often require AVI input. Converting old 3G2 phone recordings to AVI makes them accessible in these specialized environments.

AVI enjoys near-universal support on Windows systems going back to Windows 3.1, and many legacy applications only accept AVI input. If you need to import old CDMA phone recordings into VirtualDub, Windows Movie Maker (legacy), industrial monitoring software, or any system built around the RIFF/AVI container, this conversion is necessary.

AVI also supports uncompressed video streams, making it useful when you need a codec-neutral intermediate format. Some video processing pipelines — particularly in forensics and medical imaging — prefer uncompressed AVI because it eliminates all codec dependencies and produces deterministic output for analysis.

FFmpeg re-encodes the 3G2 H.263 or MPEG-4 Part 2 video to MPEG-4 Part 2 (or optionally DivX/XviD) inside the AVI RIFF container. Audio is transcoded from AMR to MP3 at 128 kbps, since AVI does not natively support AMR audio. The AVI container uses interleaved audio/video chunks with an index at the end of the file. For maximum compatibility with legacy players, the output uses the standard AVI 1.0 format rather than OpenDML (AVI 2.0).

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

8MB free, 50MB Nitro

AVI is outdated for general use — MP4 or MKV are better choices for modern playback. However, AVI remains necessary for specific legacy systems, forensic tools, and industrial applications that require it.

MPEG-4 Part 2 (XviD) for legacy compatibility, or H.264 via the ffdshow codec pack for better quality. For maximum universality, MPEG-4 Part 2 is the safest choice.

Typically yes, because AVI overhead is larger than 3G2 and the video is re-encoded at higher bitrates for quality. An uncompressed AVI can be 100x larger than the source.

Yes. VLC, Windows Media Player, MPC-HC, and most modern players handle AVI without issues. macOS QuickTime may require additional codecs depending on the video stream.

AVI has very limited subtitle support compared to MKV or MP4. External SRT files can be used alongside AVI, but embedded subtitles are not well supported.

Device	3G2	AVI
Windows PC	Partial	Native
macOS	Partial	Partial
iPhone/iPad	Partial	Partial
Android	Native	Partial
Linux	Partial	Partial
Web Browser	No	No

Egenskap	3G2	AVI
Fullt navn	3GPP2 Multimedia	Audio Video Interleave
Filendelse	.3g2	.avi
Best egnet for	Mobile optimized	Windows native

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