https://github.com/eduidl/mcapdecode-rs

Converting MCAP data into Apache Arrow representations
https://github.com/eduidl/mcapdecode-rs

apache-arrow mcap rust

Last synced: 22 days ago
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Converting MCAP data into Apache Arrow representations

• Host: GitHub
• URL: https://github.com/eduidl/mcapdecode-rs
• Owner: eduidl
• License: apache-2.0
• Created: 2026-02-14T06:20:03.000Z (3 months ago)
• Default Branch: main
• Last Pushed: 2026-04-29T07:51:53.000Z (26 days ago)
• Last Synced: 2026-04-29T08:29:05.749Z (26 days ago)
• Topics: apache-arrow, mcap, rust
• Language: Rust
• Homepage:
• Size: 239 KB
• Stars: 1
• Watchers: 0
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE.md

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README

          
# mcapdecode-rs

[![CI](https://github.com/eduidl/mcapdecode-rs/actions/workflows/ci.yml/badge.svg)](https://github.com/eduidl/mcapdecode-rs/actions/workflows/ci.yml)

[![crates.io](https://img.shields.io/crates/v/mcapdecode.svg)](https://crates.io/crates/mcapdecode)

Rust workspace for decoding MCAP data into a normalized schema/value model, with optional Apache Arrow integration.

## Crates

- [`mcapdecode`](mcapdecode/mcapdecode): library entry point for decoding MCAP into structured messages, with optional Arrow `RecordBatch` output

- [`transmcap`](tools/transmcap): CLI for converting MCAP to `jsonl/csv/parquet`

- [`mcaptui`](tools/mcaptui): terminal UI for browsing topics, decoded messages, and derived schemas interactively

- `mcapdecode-*`: internal/support crates used by `mcapdecode`

## Start Here

- CLI usage and options: [`tools/transmcap/README.md`](tools/transmcap/README.md)

- TUI usage and key bindings: [`tools/mcaptui/README.md`](tools/mcaptui/README.md)

- Library usage and feature flags: [`mcapdecode/mcapdecode/README.md`](mcapdecode/mcapdecode/README.md)

`mcapdecode` defaults to the schema/value API plus built-in decoders. Arrow support is opt-in via the `arrow` feature.

## Quick CLI Usage (`transmcap`)

```bash

cargo run -p transmcap -- convert  --topic  --format jsonl

cargo run -p transmcap -- schema  --topic 

```

Use `-o/--output` to write files (`parquet` requires `-o`).

## Quick Commands

```bash

cargo build -p transmcap

cargo build -p mcaptui

cargo test --workspace

```