MyMediaTools

Convert DVR to 3GPP — Free Online Tool

Convert DVR recordings to 3GPP (.3gp) format for playback on mobile devices and 3G-compatible platforms. This tool re-encodes the DVR source using H.264 video and AAC audio at a low bitrate profile optimized for mobile streaming, running entirely in your browser with no file uploads required.

FFmpeg Command

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Estimated output:

Conversion Complete!

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How It Works

DVR files typically store H.264 or MJPEG video alongside AAC or MP3 audio in a proprietary container used by digital video recorders. During conversion, this tool re-encodes the video stream using the libx264 encoder at CRF 23 — a visually balanced quality level — and transcodes the audio to AAC at 64k bitrate, which is the standard low-bitrate target for 3GPP's mobile-first design. The output is wrapped in the 3GPP container (.3gp) with the -movflags +faststart flag applied, which repositions the MP4/3GP metadata atom to the beginning of the file so it can begin streaming or playing before the entire file is downloaded. Because DVR is a proprietary format with no standardized codec mapping, full re-encoding is always performed rather than a simple remux.

What Each Flag Does

Flag What it does
ffmpeg Invokes the FFmpeg binary, the open-source multimedia processing engine that handles demuxing the proprietary DVR container, decoding its video and audio streams, re-encoding them, and muxing the result into the 3GPP output file.
-i input.dvr Specifies the input DVR file. FFmpeg probes the file to identify its internal container structure, video codec (typically H.264 or MJPEG), and audio codec (typically AAC or MP3) before beginning the conversion.
-c:v libx264 Encodes the output video stream using the libx264 H.264 encoder, which is the standard video codec for 3GPP files and is universally supported by mobile devices that play 3GP content.
-c:a aac Transcodes the audio stream to AAC using FFmpeg's native AAC encoder, matching the 3GPP format's default audio codec and ensuring compatibility with mobile players that expect AAC in 3GP containers.
-crf 23 Sets the Constant Rate Factor for the H.264 encode to 23, the midpoint of 3GPP's supported quality range (18–28). This balances visual quality and file size, suitable for surveillance and broadcast DVR footage being adapted for mobile viewing.
-b:a 64k Sets the AAC audio bitrate to 64 kilobits per second, which is the 3GPP format's default audio target, designed for the bandwidth constraints of 3G mobile networks and sufficient for speech and surveillance audio from DVR recordings.
-movflags +faststart Relocates the 3GP file's moov metadata atom to the start of the file, enabling progressive playback on mobile devices — critical for 3GPP files that may be streamed over slow mobile connections rather than fully downloaded first.
output.3gp Specifies the output filename with the .3gp extension, which signals FFmpeg to mux the re-encoded H.264 video and AAC audio into the 3GPP container format standardized for mobile multimedia delivery.

Common Use Cases

  • Transferring surveillance or security DVR footage to a mobile phone for review in the field without needing a desktop DVR player application
  • Sharing short clips from a TV recording or broadcast capture with colleagues using older 3G mobile devices that only support 3GPP playback
  • Archiving timestamped DVR security footage in a smaller, mobile-compatible format for submission to law enforcement or insurance providers via mobile upload portals
  • Preparing DVR footage for upload to legacy video platforms or MMS messaging systems that still require 3GPP-formatted video
  • Reducing the file size of DVR recordings from home security systems so they can be stored on memory-constrained mobile devices
  • Previewing surveillance footage clips on a mobile handset while on-site, converting segments locally without sending sensitive recordings to a cloud server

Frequently Asked Questions

Yes, some quality reduction is expected. DVR files are already lossy, and re-encoding to 3GPP introduces a second generation of compression loss. The default CRF 23 setting produces visually acceptable quality for surveillance and broadcast footage, but fine detail — particularly in fast-moving scenes — may degrade slightly. The 64k audio bitrate is also quite low by modern standards, though it is appropriate for the 3GPP mobile-streaming context.
3GPP was designed for 3G mobile networks with limited bandwidth, so its audio quality defaults are intentionally conservative. The 64k AAC bitrate is the 3GPP format standard default and is sufficient for speech, surveillance audio, or TV dialogue. If your source DVR recording contains music or requires higher fidelity, you can modify the FFmpeg command to use -b:a 96k or -b:a 128k instead.
The -movflags +faststart flag moves the moov atom — the container's metadata index — from the end of the file to the beginning. In 3GPP files, which share the ISO base media file format with MP4, the moov atom must be at the start for progressive streaming and fast playback initiation on mobile devices. Without it, a 3GP player would need to download the entire file before it could begin decoding, which is problematic on slow 3G connections.
No. Neither the DVR input format nor the 3GPP output format supports subtitles, chapters, or multiple audio tracks in this conversion pipeline. Only the first video stream and first audio stream from your DVR file will be included in the 3GP output. If your DVR recording has embedded text overlays baked into the video (such as timestamps from a security camera), those will be preserved since they are part of the video pixels, not a separate subtitle stream.
Video quality is controlled by the -crf value. Lower numbers mean higher quality and larger files — use -crf 18 for near-lossless quality or -crf 28 for aggressive compression and smaller output. For 3GPP, valid CRF values range from 18 to 28. To reduce file size for very small storage or slow connections, also lower the audio bitrate with -b:a 48k or -b:a 32k. For example: ffmpeg -i input.dvr -c:v libx264 -c:a aac -crf 28 -b:a 48k -movflags +faststart output.3gp
Yes. On Linux or macOS, you can use a shell loop: for f in *.dvr; do ffmpeg -i "$f" -c:v libx264 -c:a aac -crf 23 -b:a 64k -movflags +faststart "${f%.dvr}.3gp"; done. On Windows Command Prompt, use: for %f in (*.dvr) do ffmpeg -i "%f" -c:v libx264 -c:a aac -crf 23 -b:a 64k -movflags +faststart "%~nf.3gp". This is particularly useful for batch-exporting clips from a security DVR system, and since the browser tool has a 1GB file limit, the command-line approach is recommended for large recordings.

Technical Notes

DVR is a proprietary container format with no single standardized specification — different manufacturers (Dahua, Hikvision, standalone DVR units) may produce DVR files with varying internal structures, codec wrapping, and timestamp encoding. FFmpeg can parse most common DVR variants, but some highly proprietary implementations may require manufacturer-specific demuxers or format probing. The video stream in DVR files is commonly H.264 (libx264-compatible) or MJPEG; both are supported codec paths for 3GPP output. The 3GPP container itself is an ISO base media file format derivative, closely related to MP4, which is why -movflags +faststart works identically to how it functions with MP4 outputs. One key limitation is that the 3GPP format cap on resolution — while not enforced by FFmpeg — is practically designed for sub-HD dimensions (typically 176x144 QCIF or 320x240 QVGA for original 3G-era compatibility). Modern 3GP players on smartphones handle HD resolutions, but if targeting legacy 3G devices, consider adding -vf scale=320:240 to the FFmpeg command. Metadata such as recording timestamps embedded in DVR proprietary headers will not transfer to the 3GP output, though timestamp overlays burned into the video frames will remain visible.

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