Convert 3GP to WTV — Free Online Tool
Convert 3GP mobile video files to WTV format for use with Windows Media Center, re-encoding the low-bandwidth H.264 stream from your 3G-era recordings into a broadcast-compatible WTV container with AAC audio at higher bitrates suited for DVR playback.
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FFmpeg Command
Copy this command to run the same conversion locally with FFmpeg on your desktop. Download FFmpeg
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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
3GP files are designed for 3G mobile networks, typically storing H.264 (libx264) video and AAC audio at very low bitrates and small resolutions to minimize file size. WTV is Windows Vista Media Center's native DVR container, designed for full-resolution broadcast recordings with richer audio and metadata support. During this conversion, FFmpeg re-encodes both the video and audio streams: the video is encoded using libx264 with CRF 23 (a balanced quality setting), and the audio is re-encoded to AAC at 128k — a significant step up from the 64k default commonly found in 3GP files. Because 3GP often contains low-resolution video (e.g., 176×144 or 320×240), the output WTV file will preserve whatever resolution the source contains; no upscaling is applied. The special dimension-rounding filter required for 3GP input (to ensure even pixel dimensions for H.264 encoding) is handled automatically. The result is a WTV file playable in Windows Media Center with improved audio fidelity and full DVR metadata embedding capability.
What Each Flag Does
| Flag | What it does |
|---|---|
ffmpeg
|
Invokes the FFmpeg binary, the open-source multimedia processing engine that powers this conversion entirely within your browser via WebAssembly (FFmpeg.wasm). |
-i input.3gp
|
Specifies the input file — a 3GP mobile video container, typically carrying H.264 video and AAC audio at low bitrates designed for 3G network transmission. |
-c:v libx264
|
Re-encodes the video stream using the libx264 H.264 encoder, which is required for WTV output. Since both 3GP and WTV support H.264, this produces a stream compatible with Windows Media Center playback. |
-c:a aac
|
Re-encodes the audio stream to AAC using FFmpeg's native AAC encoder. The 3GP source already contains AAC audio, but re-encoding is necessary to apply the higher 128k bitrate target and ensure proper muxing into the WTV container structure. |
-crf 23
|
Sets the Constant Rate Factor for libx264 to 23, a balanced quality level. For low-resolution 3GP source material, this setting preserves the available detail without producing unnecessarily large WTV output files. |
-b:a 128k
|
Sets the AAC audio bitrate to 128k for the WTV output — double the 64k default of the 3GP source — improving audio clarity for home theater playback in Windows Media Center. |
output.wtv
|
Specifies the output filename with the .wtv extension, which tells FFmpeg to mux the re-encoded streams into the Windows Television container format recognized by Windows Vista and Windows 7 Media Center. |
Common Use Cases
- Archiving old 3G mobile phone recordings into a Windows Media Center library where WTV is the native playback format
- Importing field footage shot on early Nokia or Sony Ericsson 3G phones into a Windows Vista/7 Media Center DVR collection
- Upgrading the audio bitrate of 3GP clips from 64k to 128k AAC for better sound quality when viewed on a home theater PC running Windows Media Center
- Consolidating a mixed media library of 3GP clips alongside broadcast TV recordings stored as WTV files for unified Media Center management
- Preparing 3GP video evidence or reference footage for playback on a Windows-based DVR appliance that only accepts WTV input
- Converting archived 3GP news or sports clips captured on mobile devices into a WTV format compatible with Windows Media Center's metadata and chapter browsing interface
Frequently Asked Questions
No — converting 3GP to WTV will not improve the original video quality. The source 3GP file typically contains video recorded at low resolutions (often 176×144 or 320×240) and low bitrates designed for 3G networks. The conversion re-encodes with CRF 23, which preserves quality faithfully at that source resolution, but it cannot recover detail that was never captured. The WTV container is simply a different wrapper suited for Windows Media Center, not a quality enhancement tool.
The default audio bitrate for this tool's 3GP input profile is 64k, which reflects the bandwidth constraints 3GP was designed for on 3G mobile networks. WTV, as a broadcast DVR format, uses 128k AAC as its default because it's intended for home theater playback where audio fidelity matters more. FFmpeg re-encodes the AAC audio stream at the higher 128k rate, so your output WTV file will sound noticeably cleaner, especially for speech and music content that suffered compression artifacts at 64k.
WTV does support subtitles, but 3GP does not — so there is no subtitle stream to carry over. If your 3GP file somehow contained a text track, it would not be mapped into the WTV output by this command, since 3GP's subtitle support is not part of the conversion profile. If you need to add subtitles to the resulting WTV file, you would need to do so as a separate step using FFmpeg's subtitle mapping flags.
Yes. On Windows, you can batch process using a simple loop in Command Prompt: `for %f in (*.3gp) do ffmpeg -i "%f" -c:v libx264 -c:a aac -crf 23 -b:a 128k "%~nf.wtv"`. On Linux or macOS with FFmpeg installed, use `for f in *.3gp; do ffmpeg -i "$f" -c:v libx264 -c:a aac -crf 23 -b:a 128k "${f%.3gp}.wtv"; done`. This is especially useful for files over 1GB, which exceed the browser tool's limit.
Change the `-crf` value in the command. CRF (Constant Rate Factor) controls libx264 quality on a scale where lower numbers mean better quality and larger files. The default is 23. For higher quality, try `-crf 18`; for smaller files at reduced quality, try `-crf 28` or higher. Because your source is a 3GP file that was already heavily compressed, setting CRF below 18 will produce diminishing returns — you'll get a larger WTV file without recovering any lost detail from the original.
Yes, Windows Media Center (on Windows Vista or Windows 7) will recognize and play the WTV file since it uses libx264 video and AAC audio, both of which are compatible with the WTV container spec. However, because the source is a 3GP mobile recording rather than an actual broadcast capture, Media Center may not populate DVR metadata fields like channel name, program title, or broadcast date. The video will play correctly, but it will appear as an unrecognized recording without broadcast metadata.
Technical Notes
3GP files impose strict constraints inherited from the 3GPP standard: video dimensions must be even numbers (hence the `scale=trunc(iw/2)*2:trunc(ih/2)*2` filter applied on input), and the format deliberately limits audio bitrates and video resolution to fit within 3G network bandwidth. When repackaging into WTV, FFmpeg must fully re-encode both streams — there is no possibility of stream copying here, because WTV is a broadcast DVR container with different structural requirements than the 3GP MPEG-4 Part 12 derivative. The WTV format supports multiple audio tracks and subtitle streams, but these capabilities are irrelevant for 3GP sources since 3GP carries only a single video and single audio track with no subtitle support. Metadata embedding is a WTV strength, but automatically generated metadata will be minimal without broadcast source information. File sizes will generally increase relative to the 3GP source, since the audio bitrate doubles (64k to 128k) and the WTV container overhead is larger than the minimal 3GP structure. There is no lossless path between these two formats — both are lossy-only containers, and every conversion introduces a generation of re-encoding loss on top of the existing 3GP compression.