Assassin's Creed game data container (generic)
Writableother
file format
Identify it
| Extensions | .ac1.ac2.ac3.ac3mp.ac3sp.ac4.ac4mp.ac4sp.acb.acl.acre.acro.acu |
|---|---|
| MIME types | application/octet-stream |
| Signatures | 7363696d69746172 at byte 0 |
| Wikidata | Q105855198 |
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Open it
- FFmpegOpen source
Convert it
| To | With | Fidelity | Command and losses |
|---|---|---|---|
| FLAC (Free Lossless Audio Codec) 1.2.1 | FFmpeg | Partial | ffmpeg -i in.ac4 out.flacAudio track only: the video is dropped. |
| Waveform Audio | FFmpeg | Partial | ffmpeg -i in.ac4 out.wavAudio track only: the video is dropped. |
| Matroska 1-4 | FFmpeg | Lossy | ffmpeg -i in.ac4 out.mkvRe-encoded with lossy codecs by default; try `-c copy` to remux without re-encoding when the codecs fit the container. |
| MPEG 1/2 Audio Layer 3 | FFmpeg | Lossy | ffmpeg -i in.ac4 out.mp3Lossy re-encoding. |
| MPEG-4 Part 14 | FFmpeg | Lossy | ffmpeg -i in.ac4 out.mp4Re-encoded with lossy codecs by default; try `-c copy` to remux without re-encoding when the codecs fit the container. |
| Ogg | FFmpeg | Lossy | ffmpeg -i in.ac4 out.oggLossy re-encoding. |
| WebM | FFmpeg | Lossy | ffmpeg -i in.ac4 out.webmRe-encoded with lossy codecs by default; try `-c copy` to remux without re-encoding when the codecs fit the container. |
Sources
From Converters (FFmpeg, ImageMagick, Pandoc, LibreOffice), Wikidata. Updated 2026-10-20.