Support for Real-Time Playback from File

[DanieleFila]

Hi, I tested the driver with the Prophesee EVK4, and it works normally. However, when I try to read from a file, the playback is not in real-time.

From your README, I found this statement:
"from_file: path to Metavision raw file. Instead of opening the camera, the driver plays back data from this file. This will not be in real time, usually faster."

Is there a solution to achieve real-time playback?

The only method I found to slow down the video was to modify line 319 in src/metavision_wrapper.cpp:

const auto cfg = Metavision::FileConfigHints().real_time_playback(true);

replacing it with:

const auto cfg = Metavision::FileConfigHints().max_read_per_op(40);

However, this obviously limits operations, causing event stream distortion.

Would you suggest a better approach to enable real-time playback?

[berndpfrommer]

I really don't know of a clean way. One would have to decode the events in the driver to get to the time stamps in order to publish in real time. What is the real_time_playback flag good for? It does not seem to work. I posed your question on the Prophesee community support forum.

[berndpfrommer]

Unfortunately, no reply on the community support forum to my question.
The only work-around I can think about is to convert the raw data to a ROS2 bag using raw_to_bag from the
event_camera_tools repo, then ros2 bag play the so-created bag.