Convert 3GPP to DVR — Free Online Tool
Convert 3GPP mobile video files to DVR format using H.264 video and AAC audio encoded directly in your browser. This tool re-encodes your 3GP footage — originally compressed for 3G mobile networks — into a DVR-compatible container suitable for digital video recorder archiving and surveillance system integration.
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FFmpeg Command
Copy this command to run the same conversion locally with FFmpeg on your desktop. Download FFmpeg
Drop your 3GPP file here
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Free — no uploads, no signups. Your files never leave your browser.
Settings
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
3GPP files use a mobile-optimized container derived from MPEG-4 Part 12, typically carrying H.264 or older MPEG-4 video alongside AAC or AMR audio. Because DVR format also uses H.264 and AAC as its primary codecs, the video stream is re-encoded using libx264 at CRF 23 (a balanced quality setting) and the audio is re-encoded to AAC at 128k bitrate — a step up from the 64k default bitrate common in 3GPP files. The 3GP container's mobile-streaming metadata and faststart flags are stripped, and the content is repackaged into the DVR container structure expected by digital video recorder systems. Since 3GPP files often originate from low-resolution mobile captures, the output quality is bounded by the source, regardless of the target bitrate settings.
What Each Flag Does
| Flag | What it does |
|---|---|
ffmpeg
|
Invokes the FFmpeg binary — the open-source multimedia processing engine that powers this conversion both in the browser (via FFmpeg.wasm) and on the desktop command line. |
-i input.3gp
|
Specifies the input file: a 3GPP container (commonly carrying H.264 or MPEG-4 video and AAC or AMR audio) as recorded by mobile devices on 3G networks. |
-c:v libx264
|
Re-encodes the video stream using the libx264 H.264 encoder, which is natively compatible with the DVR format's expected video codec and produces highly compressed, broadly decodable output. |
-c:a aac
|
Re-encodes the audio stream to AAC using FFmpeg's built-in AAC encoder — upgrading from the 3GP's potentially low-bitrate or AMR-encoded audio to a standard AAC track suited to DVR playback systems. |
-crf 23
|
Sets the Constant Rate Factor for the H.264 encoder to 23, the default balanced quality level. Lower values (e.g., 18) yield better quality and larger files; higher values (e.g., 28–36) reduce file size at the cost of quality. The actual perceived quality ceiling is limited by what the source 3GP already contains. |
-b:a 128k
|
Sets the AAC audio bitrate to 128 kilobits per second — double the 64k default used in 3GPP mobile files — providing cleaner audio reproduction in the DVR output, appropriate for local storage playback rather than bandwidth-constrained mobile streaming. |
output.dvr
|
Defines the output filename and tells FFmpeg to write the result into a .dvr container, repackaging the re-encoded H.264 video and AAC audio into the file structure expected by digital video recorder systems. |
Common Use Cases
- Archiving dashcam or older mobile phone footage captured in 3GP format into a DVR system that only accepts its proprietary container format
- Integrating video clips recorded on 3G-era mobile devices into a surveillance or security system's DVR library for centralized playback and review
- Converting field-recorded 3GPP inspection or site-survey videos into DVR format for ingestion into broadcast-capture or facility management software
- Repurposing low-bitrate 3GP security footage from legacy mobile cameras into a DVR-compatible format with higher audio fidelity (64k to 128k AAC)
- Preparing archived 3GPP news or event footage for storage within DVR-based broadcast capture systems used by television production facilities
Frequently Asked Questions
No — re-encoding cannot recover detail that was discarded when the original 3GPP file was created. 3GPP files are designed for 3G mobile networks and often carry video at low resolutions (e.g., 176x144 or 320x240) with high compression. The libx264 encoder at CRF 23 will faithfully reproduce whatever quality exists in the source, but the output DVR file will not look sharper or more detailed than the original 3GP.
3GPP files default to 64k AAC audio because mobile 3G bandwidth constraints made low bitrates essential. DVR systems are typically used in local storage environments with no such bandwidth restrictions, so the default audio quality is set to 128k AAC — double the bitrate — for better clarity during playback and review. If your source 3GP file already had audio at or below 64k, the re-encoded 128k output will sound slightly cleaner due to the more generous encoding budget, though the original recording limitations still apply.
DVR is a proprietary container format, and compatibility depends heavily on the specific DVR hardware or software vendor involved. Because this tool encodes the content using standard H.264 and AAC codecs, some DVR software that accepts generic H.264 streams within a .dvr wrapper will play the file correctly. However, manufacturer-specific DVR systems using encrypted or proprietary bitstream extensions may not recognize the output. Check your DVR system's documentation for supported codec profiles before converting.
No. 3GPP containers can embed mobile-specific metadata including capture timestamps, GPS coordinates, and device information in their atom-based structure. This metadata is not mapped to the DVR container format during conversion, and FFmpeg does not preserve 3GP-specific mobile metadata tags when re-encoding to DVR. If this metadata is important, extract it from the 3GP file using a separate tool before converting.
Adjust the -crf value in the command to control video quality. The scale runs from 0 (lossless) to 51 (worst quality), with 23 as the default balanced setting. For a higher-quality DVR output — useful if your 3GP source is higher resolution — try -crf 18. For a smaller file size where quality is less critical, try -crf 28 or -crf 36. Run: ffmpeg -i input.3gp -c:v libx264 -c:a aac -crf 18 -b:a 128k output.dvr
Yes. On Linux or macOS, use a shell loop: for f in *.3gp; do ffmpeg -i "$f" -c:v libx264 -c:a aac -crf 23 -b:a 128k "${f%.3gp}.dvr"; done. On Windows Command Prompt, use: for %f in (*.3gp) do ffmpeg -i "%f" -c:v libx264 -c:a aac -crf 23 -b:a 128k "%~nf.dvr". This applies the same encoding settings to every 3GP file in the current directory. The browser-based tool processes one file at a time, so the FFmpeg command is the recommended approach for batch workloads.
Technical Notes
Both 3GPP and DVR rely on H.264 (libx264) for video and AAC for audio, which means there is no codec-level incompatibility during this conversion — but full re-encoding still occurs rather than a lossless remux, because the container structures and metadata layouts are incompatible. The 3GPP format uses an ISO Base Media File Format (ISOBMFF) atom hierarchy with mobile-specific extensions (including '-movflags +faststart' for streaming), none of which are applicable or preserved in the DVR output. CRF 23 is a visually transparent setting for typical content, but because 3GP source files are often already heavily compressed artifacts may be amplified if the source CRF-equivalent was higher than 23. The DVR format does not support subtitles, chapters, or multiple audio tracks — matching the 3GPP source's own limitations in this regard. Transparency is unsupported in both formats. One notable difference: 3GPP historically supported AMR-NB and AMR-WB audio codecs common in voice-optimized mobile recordings; if your 3GP file uses AMR audio (rather than AAC), FFmpeg will transcode it to AAC as part of this conversion, which may introduce a minor quality change in speech audio.