Convert REPLAY to MP4

A game replay must be converted to MP4 when footage needs to be shared, edited, uploaded, or played on devices without the original game. Because .replay usually stores match data rather than video frames, the reliable method is to play it in the game and record the playback.

What the REPLAY format is

.replay is a game-specific format used by titles such as Fortnite and Rocket League. It normally stores player actions, timing, camera state, and game-state information that the original game engine reconstructs in its replay viewer.

There is no universal .replay specification: two games can use the same extension for incompatible data. A replay may depend on the game version, platform, map, installed assets, and online services that created it. It generally contains no encoded video frames, standard audio track, or conventional video metadata.

Open the file with the game that created it, not with VLC, HandBrake, or a browser. Renaming .replay to .mp4 only changes the filename and does not create a video.

What the MP4 format is

MP4 is a standard multimedia container based on ISO Base Media File Format. It can contain video, audio, subtitles, and metadata; H.264 video with AAC audio is a widely compatible combination for phones, browsers, media players, editors, and video platforms.

An MP4 recording is independent of the game’s replay system, so it can be edited in DaVinci Resolve or Adobe Premiere Pro and played after the game no longer supports the replay.

How to convert REPLAY to MP4

1. Install the game that created the file and update it only as far as necessary to load the replay. A later game version may no longer reproduce an older replay correctly.
2. Use the game’s replay browser or copy the file into the title’s replay directory if it has no import command. The directory and import procedure vary by game.
3. Open the replay and set the camera, playback speed, HUD, graphics quality, resolution, and frame rate. Disable notifications, chat overlays, and other elements that should not appear in the recording.
4. Install OBS Studio and add a Game Capture source for the game. If that source produces a black screen or does not detect the game, use Window Capture or Display Capture. Xbox Game Bar and NVIDIA’s in-game recording tool are simpler alternatives on supported Windows systems.
5. In OBS, open Settings → Output → Recording and choose H.264 video with AAC audio if those encoders are available. Match the capture resolution to the game output and use 30 or 60 fps according to the replay’s motion and the intended destination.
6. Start recording, play the replay from the required point, stop recording at the end, and test the resulting video in a media player and editor.

OBS recommends recording to .mkv because an interrupted recording is less likely to become unusable. After recording, use File → Remux Recordings in OBS to create an MP4 without re-encoding. The equivalent FFmpeg command is:

ffmpeg -i recording.mkv -c copy recording.mp4

Remuxing works only when the existing video and audio codecs are supported by the MP4 container and target software. If they are not, re-encode the captured video:

ffmpeg -i input.mkv -c:v libx264 -preset medium -crf 18 -c:a aac -b:a 192k output.mp4

For a browser-based conversion, first create a normal video file from the replay, then upload that file to a reputable service such as CloudConvert or Zamzar and select MP4. These services cannot normally run a game engine to interpret a proprietary replay, and uploading a replay may fail or disclose match data; check the service’s file-retention policy before uploading private footage.

Quality and compatibility limits

The recording quality depends on the game’s rendered resolution, graphics settings, frame rate, capture settings, and encoder. Increasing the output resolution cannot restore detail that the game did not render.

Replay playback can differ from the original match after a game update, physics change, missing asset, or server-side change. Some replay systems omit voice chat, spectator-camera data, licensed music, or other synchronized content.

If the MP4 has no sound, check the game’s selected output device, the OBS audio mixer, desktop-audio permissions, and per-application privacy settings before recording again. If the video stutters, lower the game or capture resolution, reduce the frame rate, or use hardware H.264 encoding when available.