ATLUS PS2 Video Format "dsi"

[AtlusBoy]

Hi everyone,
I recently encountered a video format on the PS2 that I haven't seen before: DSI. This format appears specifically in the ATLUS PS2 title, MAKEN X.
This is unusual because the DSI format is not the common PSS or SFD formats widely used on the PS2, nor is it the IPU format referenced in the PS2 SDK. I have checked other ATLUS PS2 games, and they universally utilize IPU or PSS, making the DSI format unique to MAKEN X.
Based on my preliminary analysis, I am confident that the first 64 bytes constitute the file header. The video stream immediately following this header is confirmed to be MPEG-2 Video.
The format should inherently contain an audio stream as well, but I am currently stuck on how to properly process this container. Specifically, I need help figuring out how to:
Extract the audio and video streams (demuxing).
Convert the streams into a common editable format.
After editing, re-encode and repack them back into the proprietary DSI format.
I am hoping experts familiar with video container formats, especially those related to PS2 or proprietary ATLUS implementations, might be able to offer assistance or guidance.
Any help would be greatly appreciated!

dsi_sample.zip

[ikskoks]

I had some notes on this format and according to them the format is also used in Naruto: Uzumaki Chronicles (PS2) and it can be converted with VGMToolbox video demultiplexer.

I hope it helps a little.

[AtlusBoy]

On 11/1/2025 at 6:58 AM, ikskoks said:

I had some notes on this format and according to them the format is also used in Naruto: Uzumaki Chronicles (PS2) and it can be converted with VGMToolbox video demultiplexer.

I hope it helps a little.

Thanks for the tip. I checked the DSI video from Naruto and found that its file header is different from Maken X's, which is why VGMToolbox can't process it either.
This is so weird... I have no idea why Atlus would create such a bizarre format.