dthd-mac2linux

Build the macOS x86-64 dee_dthd_encoder as a Linux ELF executable. dthd-mac2linux builds the executable; dthd-darwin-abi contains the runtime compatibility code. You supply the Dolby payload, Linux MediaInfo library and valid license. Tested with DEE 6.7.0+8e353f99. Other versions need testing.

Copyright 2026 Rainbaby. Code licensed under Apache-2.0.

Build

Build on Ubuntu 24.04 x86-64 with Rust 1.97.1 from rust-toolchain.toml. The pinned toolchain uses GCC/G++ 13.3, binutils 2.42 and LLVM 18.1.3. Builds use a pinned glibc 2.34 sysroot. Exact versions and input hashes are in config/inputs.lock. Run commands from a Git checkout with its release tags.

sudo apt-get install build-essential binutils git curl xz-utils ca-certificates \
  rpm2cpio cpio
cargo run --locked --release -- fetch-sources inputs/sources
cargo run --locked --release -- build \
  --payload /path/to/dee_dthd_encoder --sources inputs/sources --verify

To build the Rust builder executable:

cargo run --locked --release -- build-builder --sources inputs/sources

--verify compares two isolated builds. dist/ contains the executable, symbol binary, checksums and BUILDINFO.json. Place the executable beside Linux DEE's libmediainfo.so.0 and license.lic. Both binaries require glibc 2.34 or newer and an x86-64-v2 CPU, matching native Linux DEE 6.7.

Use --allow-unpinned-payload to try another encoder payload. It must pass check-payload screening; encoding still needs validation. Source archives remain pinned; the Unicode snapshot is bundled in data/. BUILDINFO.json records the actual payload hash.

Validation

Encoding comparisons use the public Sol Levante DAMF (Netflix and Production I.G, 2020; CC BY 4.0), with 16 elements, legacy_authoring=0 and skip:dialnorm=-31. We compare the 16-channel presentation and OAMD from macOS and Windows DEE 6.7 and this Linux port, decoded in strict mode. Encoded files can differ between runs.

Master preprocessing

The full 263.08-second master requires clustering into 16 elements and metadata smoothing. These runs use normal preprocessing. The macOS/Windows comparison shows differences between the native encoders; Linux matches macOS exactly. Audio differences are in 24-bit PCM units. Means use all samples and channels.

Difference	Linux / macOS	macOS / Windows
PCM max absolute	0	16
PCM mean absolute	0	0.000161
PCM RMS	0	0.050752
PCM samples differing	0%	0.001006%
OAMD	Identical	Identical

Re-encoding decoded input

All three encoders use the same decoded Sol Levante input: LFE plus 15 objects, with metadata aligned to frames. dee-shim (dthd_encoder --oamd-as-is on --as-is on) turns off clustering, smoothing and noise shaping, and corrects PCM scaling and timing. We compare the output with the input, using the same channel mapping for audio and OAMD IDs.

Difference from input	Linux / macOS / Windows	All three, with dee-shim
PCM max absolute	143040	0
PCM mean absolute	4.674614	0
PCM 99.9th percentile absolute	32	0
PCM RMS	190.843884	0
PCM RMS (dBFS)	-92.86	−∞
PCM samples differing	23.995806%	0%
OAMD events changed	15,279	0
OAMD events added	3,962	0
OAMD events removed	288	0

99.80% of squared PCM error is in the 64 ms from 61.408 to 61.472 seconds.

Input and normal re-encoding for objects 24 and 15. The bottom plot shows each object's PCM error and their sum.

Changed OAMD events have the same object ID and sample timestamp but different positions. The input has 32,579 events.

Input and normal re-encoding, 97.520–98.000 s at 0.1× speed. DAMF origin: bottom centre.

Benchmark

Full Sol Levante with normal preprocessing: Linux port v0.1.1 and Windows DEE 6.7. Xeon Platinum 8480+, affinity set to 32 logical CPUs. Times are the median (minimum–maximum) of three runs after a warm-up. The two hosts are measured separately. Temporary files were in RAM except on native Windows, which used its virtual disk.

Ubuntu 24.04 container

Encoder	Execution	Time (s)
Linux port	Native Linux	100.9 (100.5–101.0)
Windows DEE 6.7	Wine 9.0	186.1 (185.2–186.9)

Windows 11 VM

Encoder	Execution	Time (s)
Linux port	Ubuntu 24.04 in WSL2	201.0 (162.0–205.9)
Windows DEE 6.7	Native Windows	212.6 (203.8–223.6)