precise timestamps for freeze events

[huxiaoyi520]

Hi ,

First, thank you for developing this great tool! I'm exploring its functionality for behavioral analysis and had a specific question:

Does ezTrack support extracting precise timestamps for freeze events (e.g., from video tracking or motion data)? If so:

If this isn't currently implemented, would you consider it as a feature request?

Thanks for your time!

[ZachPenn]

As indicated in the manuscript, ezTrack outputs frame by frame freezing (0=No Freezing, 100=Freezing). However, most videos do not provide timestamps so this information has to be acquired in some other way by the user. Some acquisition softwares (e.g., UCLA Miniscope acquisition software) provide a csv of timestamps for each frame. Alternatively, provided you are confident in the sampling rate of your camera (e.g., 30 fps), frame times can sometimes be deduced from the start-time of the video. However, note that video frame rates often vary considerably from the nominal frame rate (for a video with nominal frame rate of 30 frames per sec, interframe intervals often fluctuate between 31-35 milliseconds in a single recording). Additionally, the timestamp associated with video file creation can reflect a number of different things (when a video file is initiated, when the first frame is saved, when the last frame is saved).