Free online DVR-MS to DAT converter

What the DVR-MS format is

DVR-MS is a Microsoft recording container used mainly by Windows XP Media Center Edition and Windows Media Center in Windows Vista and Windows 7. It stores recorded television, typically using MPEG-2 video and MPEG-1 Layer II or AC-3 audio, together with program metadata and, in some cases, broadcast copy-protection information.

You usually encounter DVR-MS files in Media Center recording folders or after copying recordings from an older Windows television PC. The container is based on Microsoft's ASF technology, so ordinary video players and editors may not recognize it even when the underlying stream is standard MPEG video.

What the DAT format is

For video conversion, DAT normally means the MPEG-1 program stream used by Video CD (VCD) discs. It is a container-like file rather than a separate video codec; the expected contents are MPEG-1 video and MPEG-1 Layer II audio.

DAT is useful for VCD authoring, legacy standalone players, and software that accepts MPEG-1 system streams. A VCD-compatible file generally uses 352×240 at 29.97 fps for NTSC or 352×288 at 25 fps for PAL, with approximately 1,150 kbit/s MPEG-1 video and 224 kbit/s, 44.1 kHz stereo audio. Simply renaming a DVR-MS file to .dat does not perform this conversion.

How to convert DVR-MS to DAT

For a no-install conversion, use the converter on 101convert.com: upload the DVR-MS file, select DAT as the output format, start the conversion, and download the resulting file. This is suitable when the recording is not protected and the destination only requires a playable MPEG video file.

For local processing, FFmpeg can read many DVR-MS recordings and encode a VCD-style MPEG-1 DAT file. The following command creates an NTSC-compatible output:

ffmpeg -i recording.dvr-ms -vf "scale=352:240:flags=lanczos,setsar=1" -r 30000/1001 -c:v mpeg1video -b:v 1150k -minrate 1150k -maxrate 1150k -bufsize 327k -g 18 -c:a mp2 -b:a 224k -ar 44100 -ac 2 -f mpeg recording.dat

For PAL material, use -vf "scale=352:288:flags=lanczos,setsar=1", -r 25, and -g 15 instead. Keep the source's television standard; changing NTSC to PAL or PAL to NTSC changes frame timing and may introduce motion artifacts.

If you only need a DAT-named MPEG file and not strict VCD compatibility, a less restrictive command avoids forced resizing:

ffmpeg -i recording.dvr-ms -c:v mpeg1video -q:v 2 -c:a mp2 -b:a 224k -ar 44100 -ac 2 -f mpeg recording.dat

Check the output with a media player before burning a disc. A VCD authoring program may require a compliant MPEG-1 stream and may create the disc's MPEGAV\AVSEQ01.DAT file itself rather than accepting a manually renamed file.

Quality and compatibility limitations

Converting an MPEG-2 DVR-MS recording to MPEG-1 DAT is a lossy re-encode. The lower VCD resolution and bitrate reduce detail, and interlaced television footage can show combing unless the encoder or a deinterlacing filter handles it.

Some DVR-MS recordings contain DRM or broadcast copy restrictions. FFmpeg and online converters cannot legitimately bypass protected content; a failed read, missing audio stream, or permission error may indicate encryption or unsupported protection rather than a bad filename.

DAT has no single universal video specification outside the VCD context. Confirm whether the receiving device expects VCD-compliant MPEG-1, MPEG-2 in a proprietary DAT container, or merely an MPEG file with a .dat extension before choosing the encoding settings.