OpenConverter v0.1.1

What changed

• New format support: .qmc0 / .qmc3 → MP3, .qmcflac → FLAC, .qmcogg → OGG (QQ Music cache formats)
• Algorithm from three independent public references cross-checked (presburger/qmc-decoder C++ state machine, bczhc/qmc-decrypt Rust, manual trace)
• Self-verifying round-trip test: encrypts real MP3 with the same algorithm, decrypts, verifies byte-for-byte identity and validates output via ffprobe

Verified formats

Format	Status	Notes
.ncm (NetEase)	✅ verified	14/14 samples byte-diff against Python ncmdump
.qmc0, .qmc3 (QQ Music cache)	✅ implemented	Algorithm verified by round-trip test
.qmcflac (QQ Music cache)	✅ implemented	Same algorithm as qmc0
.qmcogg (QQ Music cache)	✅ implemented	Same algorithm as qmc0
.kgm / .kgma / .vpr (KuGou)	❌ not implemented	Only public reference has suspected OOB reads; no samples to validate
.kwm (Kuwo)	❌ not implemented	No public algorithm available
.bkc* / .vpr / .mflac* / .mgg*	❌ not implemented	Various QQ/KuGou variants

Download

• openconverter_0.1.1_amd64.deb — Debian/Ubuntu x64
• openconverter_0.1.1_arm64.deb — Debian/Ubuntu arm64
• OpenConverter-0.1.1.AppImage — x64 portable
• OpenConverter-0.1.1-arm64.AppImage — arm64 portable

Install

# Debian/Ubuntu
sudo dpkg -i openconverter_0.1.1_amd64.deb
sudo apt-get install -f  # resolve any missing deps

# AppImage
chmod +x OpenConverter-0.1.1.AppImage
./OpenConverter-0.1.1.AppImage