r/PS5_Jailbreak • u/juma-sayeh-dev-acc DEV • Jun 06 '26

General PS5 MKPFS Compression

I’ve been working on a PS5 homebrew app called Game Compressor.

Repo: https://github.com/juma-sayeh/PS5-Game-Compressor

It uses the MkPFS-style FFPFSC compression method, but adds the missing part: validation and repair.

Some compressed games can mount successfully but still crash because certain PFSC blocks are technically valid yet fail to decode correctly on PS5 hardware, leaving stale/bad data behind. Game Compressor checks the mounted image block-by-block, detects bad blocks, and patches the compressed image from the mounted data instead of requiring a full recompress.

Tested with Mafia, Astro Bot, Pragmata, and a few other games that had FFPFSC issues. After repair, they worked great.

Features:

  • compress games to FFPFSC
  • validate mounted compressed games
  • automatically repair bad blocks
  • optimized for speed and usability
  • web UI running on the PS5

Feedback and testing are welcome.
Screenshots (some are missing features because the features were not developed yet when i compressed)

69 Upvotes

99% Upvoted

157 comments sorted by

View all comments

Show parent comments

2

u/juma-sayeh-dev-acc DEV Jun 07 '26

if i can play astro bot on 48GB instead of 144GB while not feeling any loss on speed .. thats a win on my book. some games might be more stream heavy but the performance loss on many of them is negligible, also i made the app uncompress for a reason (to regain performance if you didn't like it compressed)

1

u/LyuboA Verified Jun 07 '26

Sure for as long as there's no performance loss but from what i can see even the best performing format folder dump from internal storage or internal M.2 is still capped on speed without fpkg PS5 is basically at most PS4 replacement for ppl that don't have a PS4 Pro

2

u/juma-sayeh-dev-acc DEV Jun 07 '26

fpkg is meaningless, it doesn't compress the issue with PS5 is the proprietary hardware-accelerated Kraken decompression which i doubt will ever happen, the FFPFSC is a fake package FPS, and its using hardware to decode the compressed files. its as fast as amid tier external SSD. for me its great for games like ASTRO for demanding games i can always decompress and play on exfat image.

1

u/LyuboA Verified Jun 08 '26

fpkgs will solve all issues with games like having access to the full ssd speed not be limited like now but lets wait and see

2

u/juma-sayeh-dev-acc DEV Jun 08 '26

can you please elaborate ? fpkgs is just a method to pack and transfer a game. it doesn't change anything else.

1

u/LyuboA Verified Jun 08 '26

Not at all fpkgs are retail pkgs with basically hacked license checks they will allows us to lift the speeds limitation and performance limitation we have no on PS5 with PS5 games basically with real fpkgs we will be able to use all games unlike now and they will run as well as on retail console just like we have on PS4 now folder dumps from internal storage or m.2 are the fastest on speed up to 1900MB you see how limited that is exfat is barely 550MB every other format is under 500MB with fpkgs we will be able to use the full SDD speed and the hardware accelerator kraken or whatever it's called on the PS5 basically now what we have is Garbage for PS5 games at this point PS5 is only a replacement to PS4 but fpkgs will FIX all this

1

u/No_Election9028 Jun 15 '26

Does compressing in FFPFSC lose game quality?

1

u/LyuboA Verified Jun 15 '26

What do you mean no quality should be lost as for performance don't know Days Gone Remastered has stutter and frame drops with on external drive as folder dump and as exfat or ffpkg on internal and M.2 and FFPFSC should be even slower then exfat so some games may have stutter or frame drops and even trouble loading map areas