Free online M4V to DAT converter

What the M4V format is

M4V is an Apple-associated variant of the MPEG-4 Part 14 container, usually containing H.264 or, less often, H.265 video with AAC audio. Apple TV, iTunes Store downloads, QuickTime-based applications, video editors, and some screen-recording tools create or export M4V files. The container is structurally close to MP4, but some M4V files carry FairPlay DRM and cannot be converted unless the file is supplied without copy protection.

What the DAT format is

In the Video category, DAT normally means the MPEG program-stream file stored on a Video CD (VCD), commonly under the disc's MPEGAV directory as AVSEQ01.DAT. VCD video uses MPEG-1 at 352×288 pixels and 25 fps for PAL or 352×240 pixels and approximately 29.97 fps for NTSC. Audio is normally MPEG-1 Layer II at 44.1 kHz.

DAT is useful when feeding a VCD authoring workflow or a legacy player that expects the VCD directory and filename convention. It is not a newer or smaller codec: conversion from H.264 M4V to MPEG-1 usually increases the file size at comparable visual quality and reduces resolution.

How to convert M4V to DAT

Using FFmpeg for a VCD-compatible MPEG stream

1. Install FFmpeg on the desktop computer and confirm that the M4V file plays without DRM.
2. Choose the television standard used by the destination player. Run the PAL preset for most of Europe and many other regions:

ffmpeg -i input.m4v -target pal-vcd output.mpg

For NTSC equipment, use:

ffmpeg -i input.m4v -target ntsc-vcd output.mpg

These presets select MPEG-1 video, VCD-compatible dimensions and frame rate, 44.1 kHz audio, and the usual VCD bit rates. If the receiving application only checks the extension, make a copy with a DAT extension after conversion:

copy output.mpg output.dat

On macOS or Linux, use cp output.mpg output.dat. Renaming does not add the sector structure of a physical VCD, so this copy is suitable only for software that accepts a standalone MPEG stream under the DAT name.

Creating an actual VCD image

For a disc or an exact VCD layout, keep the FFmpeg output as output.mpg and author it with the desktop utility VCDImager:

vcdimager -t vcd2 -c disc.cue -b disc.bin output.mpg

Write disc.bin and disc.cue with a CD-image utility. The resulting VCD contains the expected MPEGAV track and DAT file structure. For multiple videos, author all compliant MPEG files together instead of concatenating them with a binary file copy.

Using the online converter

You can convert the file on 101convert.com for free without installing software. Upload a non-DRM M4V file, select DAT as the output format if available, start the conversion, and download the result. Check whether the output is intended as a standalone MPEG stream or as a VCD image before transferring it to a disc or legacy device.

Quality, compatibility, and limitations

The conversion is normally lossy twice: the M4V is decoded, then the frames are re-encoded as MPEG-1. A high-resolution M4V cannot preserve its original detail in VCD format, whose maximum active image size is 352 pixels wide. Avoid repeated conversions and use the original M4V as the archival master.

PAL and NTSC settings must match the target player; an incorrect standard can cause playback failure or unstable video. A file named .dat may still fail on a VCD player if it lacks VCD-compliant MPEG parameters, the required disc filesystem, or the correct sector layout. DRM-protected M4V files are a source restriction rather than a format-conversion problem.