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mcap-ros1-support

library0.7.4pypypi✓ verified 84d ago

ROS1 support for the Python MCAP library. Provides utilities for reading and writing ROS1 messages in MCAP files, including conversion between ROS1 message definitions and MCAP schemas. Current version 0.7.4, compatible with Python >=3.7.

storage devops

pip install mcap-ros1-support

github ↗homepage ↗

INSTALL

IMPORT

SIG · MCAP-ROS1-SUPPORT

mcap-ros1-support

storagepythonv0.7.4

harness data pending

Install & Compatibility

Where this runs

No compatibility data collected yet for this library.

Code

Verified usage

Verified import paths — ran on the pinned version, not inferred.

Ros1Reader

✓ from mcap_ros1.reader import read_ros1_messages

✗ from mcap_ros1 import Ros1Reader

Reader is not a class; use read_ros1_messages function

Ros1Writer

✓ from mcap_ros1.writer import Ros1Writer

Writer is available as a class

Read ROS1 messages from an MCAP file.

from mcap_ros1.reader import read_ros1_messages from mcap.reader import make_reader with open('file.mcap', 'rb') as f: reader = make_reader(f) for schema, channel, message in read_ros1_messages(reader): print(schema.name, channel.topic, message.ros_msg)

Debug

Known issues

gotcharead_ros1_messages expects an MCAP reader, not a file path. Always wrap with make_reader first.

fix

Use make_reader on the file object, then pass to read_ros1_messages.

affects: all

deprecatedSome older versions used mcap_ros1.msg module which is now deprecated in favor of mcap_ros1.reader/writer.

fix

Update imports to use mcap_ros1.reader and mcap_ros1.writer.

affects: <0.6.0

gotchaRos1Writer requires message definitions (definitions) to be passed; otherwise schemas may be missing.

fix

Provide message definitions via definitions parameter when creating Ros1Writer.

affects: all

Errors

Common errors & fixes

ModuleNotFoundError: No module named 'mcap_ros1'

Package not installed

fix

Run 'pip install mcap-ros1-support'

AttributeError: module 'mcap_ros1' has no attribute 'read_ros1_messages'

Incorrect import: trying to access function from top-level module

fix

Use 'from mcap_ros1.reader import read_ros1_messages'

Upgrade

Version history

0.7.4latest on PyPI · released Dec 24, 2025

Audit

Dependencies

mcaprequiredCore MCAP library required for reading/writing MCAP files

rosbagsoptionalUsed for ROS1 serialization/deserialization

Agent activity

34 hits · last 30 days

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OpenAI (training)

Resources

githubhttps://github.com/foxglove/mcap ↗

homepagehttps://github.com/foxglove/mcap ↗