Convert XKR to MP4

To share a Sing-Magic karaoke performance as a video, or edit it in software that accepts MP4, you need to capture the song while it plays. XKR files do not have a dependable direct conversion path; recording playback is the practical option.

What the XKR format is

XKR is a proprietary karaoke-song format used by Sing-Magic Karaoke. It stores Sing-Magic karaoke content, but its internal encoding is not a standard audio or video format, so general-purpose converters cannot reliably open or extract it. Use Sing-Magic to play the file.

What MP4 offers

MP4 is a media container commonly used with H.264 video and AAC audio. Those codecs are widely supported by phones, editors, browsers, and media players. An MP4 recording can show the karaoke lyrics while capturing the backing track; it records the playback rather than extracting the source data.

Record playback as MP4

1. Open the XKR file in Sing-Magic Karaoke and check that the song and lyrics play correctly.
2. In OBS Studio, add a Window Capture source for Sing-Magic. If the window does not display correctly, use Display Capture and crop the recording to the karaoke area.
3. Set up audio capture for the device or application playing Sing-Magic. On supported Windows versions, use OBS Application Audio Capture; otherwise select the system playback or loopback source available on your operating system. Check that the OBS audio meter moves before recording.
4. In Settings → Output → Recording, select MKV as the recording format and H.264 video with AAC audio. Choose a resolution and frame rate that keep the lyrics legible. MKV is safer during recording than writing directly to MP4 if OBS or the computer stops unexpectedly.
5. Start recording, play the song from beginning to end, and stop recording. Use File → Remux Recordings in OBS to convert the MKV container to MP4. Remuxing does not re-encode the audio or video.

If your OBS version or selected encoders do not offer H.264 and AAC, choose compatible encoders before recording; MP4 remuxing depends on the recorded codecs. Online converters generally cannot interpret proprietary XKR files, so they do not replace playback capture. Record only content you are permitted to use.

Quality and compatibility

Recording takes as long as the song plays, and the result cannot be clearer than Sing-Magic’s playback and the capture settings. Set playback volume below clipping, silence notifications and other system sounds, and avoid moving or resizing the lyrics during capture. The MP4 will contain only the audio and screen image captured by OBS, not editable lyric timing or separate karaoke tracks.