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Replay a recording

Play back an MCAP file or a ROS 2 bag and scrub through it. Use it to review a run or build tests on real data.

Before you start

  • The recording on this computer: a .mcap file, a folder of them, or a ROS 2 bag folder.
  • To install a connector, sign this computer in.

Steps

  1. Open Inputs and press Add input.
  2. Search for mcap, or ros2 for a ROS 2 bag. If it shows Install, select it to install it.
  3. Fill the fields for your connector:
Connector
FieldSet to
Recording/data/run_42.mcap, or a folder of them
TimeAs recorded
Speed1 plays at recorded speed; 0 loads as fast as the disk allows
Loopleave off
  1. In Topics, tick the topics to bring in. The table shows what each one becomes.
  2. Press Add & start.
  3. Open Replay. In the time control, choose All history or the day of the recording.
  4. Press /, type part of a topic name, and tick its channels.
  5. Drag the playhead along the scrubber, or press Space to play.

Check it worked

On Inputs the row counts samples, then shows finished. On Replay the scrubber shows bands where there is data, and the charts move as you scrub.

Note

With Loop on, the file replays over and over, timed as if it were arriving now. It shows on Live, not on Replay.

ReplayThe scrubber, channel search and keyboard keysFiles & recordingsEvery recording type you can addVerify that your data is arrivingRead an input's row when nothing shows

Updated