Although the Slomo module can be used standalone, e.g. as a broadcast delayer, it is typically the workhorse for a replay system where each camera angle is processed by one Slomo module. It can be controlled by a master controller like JLCooper I/O or through API calls. The module consists of a highly efficient audio/video recorder and a programmable number of fast video players with slomo capability. Optional OSD is available for information like timecode and slomo speed.



Right click the module to open its popup menu. The following additional menu entries are available.


Pause Recording

When checked the recording is paused. Playback remains available.


Record Drive

Select a drive for the record buffer. Preferably each Slomo module will use a dedicated NVMe or USB 3.1 SSD as record drive although fast SSDs can support multiple modules. Data rates are high, e.g. for 720p50 video the write data rate will be 69 MB/s (1280*720*1.5*50). Keep in mind that the specified write speed for an SSD drive can drop significantly when it starts overwriting old data (block erase) and/or due to thermal throttling.


Record Buffer Size

Select the percentage of free space on the record buffer drive to be used for recording. If the record buffer is full the old frames will be deleted when new frames are added. Also displays the corresponding recording time.


Clip Export Folder

Select a folder to store compressed video clips. Note saved clips are kept in the record buffer, the folder selected here is for optional (compressed) export of clips for e.g. publishing on social media.


Action > On Program > Replay

One-click instant replay. When selected a replay at half speed off the last 10 s will start when the module is selected for program output. The video below shows this feature combined with the play action and a touch screen.



Option > Alpha

When Premultiplied is selected the recorded video will include the alpha channel. Note this increases disk requirements for bandwidth and capacity by 67%.