For trimming (video and audio option) please use the so (start offset) and eo (end offset) parameters.
Option t (time) can be used for video to image transformation. For example, to get an image from the 3rd second of video, use t_3 as an option and set the extension to jpg in the URL:
https://media.publit.io/file/t_3,w_800/tummy.jpgTo create a 2-second long trimmed video out of the original video starting from 2nd second, use so_2,eo_2 in the URL. so_2 indicates from which second (2) to start trimming and eo_2 is making the trimmed video 2 seconds long:
https://media.publit.io/file/so_2,eo_2,h_480/tummy.mp4To create a 2 second long trimmed audio from original audio starting at 1st second, use so_1,eo_2 in the URL. so_1 indicates at which second (1) to start trimming and eo_2 makes the trimmed audio 2 seconds long:
https://media.publit.io/file/so_1,eo_2/railgun.mp3Detailed instructions can be found on the docs page