Free online AVC to DAT converter

What the AVC format is

AVC usually refers to H.264/MPEG-4 AVC, a video compression standard used by cameras, screen-recording software, phones, Blu-ray sources, and video containers such as MP4, MTS, and MKV. A file named .avc is often a raw H.264 elementary stream rather than a container, so it may contain video without audio, timestamps, or metadata. FFmpeg, VLC, and many professional video editors can decode it; some applications require the stream to be wrapped in a container before editing.

What the DAT format is

For Video-category files, .dat commonly means the MPEG-1 program stream stored on a Video CD, usually in the disc's MPEGAV folder. It is designed for VCD players and authoring software, not for general-purpose data storage. A compliant VCD stream normally uses MPEG-1 video at 352×288 pixels for PAL or 352×240 for NTSC, with MPEG-1 Layer II audio at 44.1 kHz. DAT can improve compatibility with legacy VCD hardware, but MPEG-1 is much less efficient than AVC and normally produces a larger file at comparable visual quality.

How to actually convert AVC to DAT

For a quick conversion without installing software, use the converter on 101convert.com: upload the AVC file, choose DAT as the output format, start the conversion, and download the generated file. The result may be a playable MPEG-1 DAT stream, but disc-authoring software is still required if you intend to create a standards-compliant Video CD.

FFmpeg provides more control and is suitable when the source is a raw AVC stream:

1. Install FFmpeg and identify the video standard required by the target player: PAL for 25-fps/50-Hz regions or NTSC for 29.97-fps/60-Hz regions.
2. Run the appropriate command:

ffmpeg -i input.avc -target pal-vcd output.dat

ffmpeg -i input.avc -target ntsc-vcd output.dat

The -target preset selects VCD-compatible MPEG-1 video, audio, resolution, bitrate, mux rate, and packet sizing. If FFmpeg cannot detect a raw AVC stream, specify its demuxer explicitly:

ffmpeg -f h264 -i input.avc -target pal-vcd output.dat

If the AVC contains no audio, FFmpeg cannot create an audio track; use a separate audio source with matching duration, for example:

ffmpeg -f h264 -i input.avc -i audio.wav -target pal-vcd -map 0:v:0 -map 1:a:0 output.dat

For disc creation, import the resulting file into VCD-authoring software and let that program validate the stream before burning. Do not merely rename an AVC file to .dat; the extension does not change the codec or container.

Quality and compatibility limitations

Because AVC is decoded and re-encoded as MPEG-1, some detail is lost and compression artifacts can increase; converting to DAT cannot improve the source quality. The VCD presets impose low resolution and bitrate limits, so widescreen material may be padded, cropped, or resized. Choose PAL or NTSC consistently with the player and authoring project, and verify that the source frame rate is compatible to avoid judder or audio synchronization errors.

Some modern players can open an MPEG-1 DAT file even when it is not a complete VCD, while older hardware may require the exact VCD directory structure and sector format. Test the output with VLC or the intended player before burning a disc.