Convert 3G2 to WTV — Free Online Tool
Convert 3G2 mobile video files to WTV format for playback and archiving in Windows Media Center. This tool re-encodes the H.264 video and AAC audio streams from the compact CDMA-era mobile container into a Windows Television container that supports subtitles, multiple audio tracks, and broadcast metadata embedding.
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FFmpeg Command
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Note: Browser-based encoding uses approximate quality targets. For precise CRF compression, copy the FFmpeg command above and run it on your desktop.
Estimated output:
Conversion Complete!
DownloadHow It Works
3G2 is a heavily constrained container developed for CDMA mobile networks, optimized for low-bitrate transmission and small file sizes. WTV is a far richer container used by Windows Vista/7/8 Media Center for storing digital broadcast recordings with full DVR metadata. Since both formats share H.264 (libx264) and AAC as their default codecs, the video and audio streams are re-encoded rather than simply remuxed — the 3G2 source is typically low resolution and low bitrate, so the encoder rebuilds the stream at the target quality settings (CRF 23 for video, 128k for audio). The output WTV file will be larger than the source because the container overhead, default quality floor, and DVR-oriented structure differ significantly from the mobile-optimized 3G2 layout. The -movflags +faststart flag used in 3G2 output is not needed for WTV, so it is dropped in the output.
What Each Flag Does
| Flag | What it does |
|---|---|
ffmpeg
|
Invokes the FFmpeg program, which handles all decoding, re-encoding, and container remuxing for this 3G2 to WTV conversion. |
-i input.3g2
|
Specifies the input 3G2 file — a mobile container from the 3GPP2 standard, typically containing H.264 video and AAC audio recorded on a CDMA-era mobile device. |
-c:v libx264
|
Re-encodes the video stream using the libx264 H.264 encoder, which is the default and most compatible video codec for the WTV container — the same codec family used in the source 3G2 but rebuilt at the target quality level. |
-c:a aac
|
Re-encodes the audio stream using the AAC codec, matching the WTV container's default audio format and ensuring compatibility with Windows Media Center playback. |
-crf 23
|
Sets the Constant Rate Factor for the H.264 video encode to 23, the default quality level — a balanced setting that works well for upscaling the quality slightly from a low-bitrate 3G2 mobile source without generating an excessively large WTV file. |
-b:a 128k
|
Sets the AAC audio bitrate to 128 kbps, which is sufficient for typical speech and ambient audio found in mobile 3G2 recordings and matches the WTV container's default audio quality setting. |
output.wtv
|
Specifies the output filename with the .wtv extension, instructing FFmpeg to mux the re-encoded H.264 and AAC streams into a Windows Television container suitable for Windows Media Center. |
Common Use Cases
- Archiving old mobile phone video recordings from CDMA-era devices (e.g., early Verizon or Sprint smartphones) into a Windows Media Center library for organized DVR-style browsing
- Importing 3G2 clips captured on legacy 3GPP2 devices into a Windows Media Center collection alongside recorded TV episodes for unified playback
- Preserving low-resolution 3G2 news clips or field recordings in a format that supports embedded broadcast metadata for cataloging purposes in a WTV-based archive
- Preparing 3G2 video content for editing workflows that begin with a WTV ingest step, such as those used with older Windows-based video production pipelines
- Converting 3G2 footage to WTV so that Windows Media Center's DVR interface can display it alongside recorded television, enabling consistent subtitle and multi-audio-track support in the output
- Migrating a library of 3G2 videos from a CDMA carrier-locked device to a Windows Home Server Media Center setup that indexes WTV files natively
Frequently Asked Questions
Yes, some quality loss is inevitable because this conversion re-encodes both the video and audio streams rather than copying them. However, since 3G2 files from mobile devices are typically already low resolution (often 176x144 or 320x240) and low bitrate, the output WTV file at CRF 23 will often look identical or even marginally cleaner due to the re-encode. The bigger concern is that you are transcoding a lossy source to another lossy format, so repeated conversions should be avoided.
3G2 was purpose-built for CDMA mobile networks where minimizing file size and bitrate was critical — files are often encoded at very low bitrates like 64–256 kbps total. WTV is a broadcast-recording container designed for full-resolution TV capture with richer metadata structures, and the default CRF 23 quality setting allocates significantly more bits than a typical mobile-encoded 3G2 source. The size increase reflects the shift from a transmission-optimized format to an archival/DVR-optimized one.
WTV natively supports subtitle tracks, but since 3G2 does not carry subtitle data, the output WTV file will have no subtitle streams. You would need to add subtitle tracks separately using an additional FFmpeg step or a tool like MKVToolNix after the conversion. The WTV container is ready to hold them, but there is nothing in the 3G2 source to carry over.
Yes — adjust the -crf value in the command to control video quality. Lower CRF values mean higher quality and larger files: use -crf 18 for near-visually-lossless output or -crf 28 for a smaller, lower-quality file. For a low-resolution 3G2 source, values between 18 and 23 are recommended since pushing beyond CRF 28 can introduce visible blocking artifacts on already-compressed mobile footage.
Yes. On Windows you can use a for loop in Command Prompt: 'for %f in (*.3g2) do ffmpeg -i "%f" -c:v libx264 -c:a aac -crf 23 -b:a 128k "%~nf.wtv"'. On Linux or macOS, use: 'for f in *.3g2; do ffmpeg -i "$f" -c:v libx264 -c:a aac -crf 23 -b:a 128k "${f%.3g2}.wtv"; done'. This is especially useful when migrating a large archive of legacy mobile recordings.
3G2 carries minimal metadata — typically just basic container-level timestamps — while WTV supports rich broadcast metadata fields like program title, channel, air date, and series information. FFmpeg will attempt to copy any metadata tags present in the 3G2 source, but most mobile-recorded 3G2 files contain very little, so the WTV output's metadata fields will largely be empty unless you populate them manually using -metadata flags in the FFmpeg command.
Technical Notes
Both 3G2 and WTV use libx264 for video and AAC for audio as their default codecs, but the two containers serve fundamentally different purposes that affect the conversion outcome. 3G2 uses the ISO Base Media File Format (like MP4) and was constrained by CDMA network bandwidth limits — most real-world 3G2 files are sub-VGA resolution with total bitrates under 500 kbps. WTV is a Microsoft-proprietary container based on the Advanced Systems Format (ASF) family and is designed to hold full broadcast-quality recordings with embedded EPG (Electronic Program Guide) metadata, multiple audio tracks (e.g., for SAP/secondary audio programming), and subtitle streams. FFmpeg's WTV muxer has reasonable but not complete compatibility with all WTV features — advanced DVR metadata fields may not be fully populated. The -movflags +faststart flag that optimizes 3G2 for progressive streaming is not applicable to WTV and is correctly omitted. Audio quality can be increased up to 320k in the WTV output (the maximum supported), which is a meaningful upgrade option if the source audio is at a higher quality than the default 128k. One known limitation: WTV files produced by FFmpeg may not always be recognized by all versions of Windows Media Center due to slight variations in container structure compared to files recorded natively by the platform.