How can I add text overlays at different time intervals to a video clip?

Cloudinary supports adding text overlays to an uploaded video asset, and also setting the start point and the end point (or the duration) for each text overlay to appear and then disappear.

Different methods are available for setting the start/end point for the text overlays. Further information can be found in the following docs (under "Trimming and Overlay offsets"):

https://cloudinary.com/documentation/video_transformation_reference

Below is an example video asset with 4 back-to-back overlaid text lines, lasting 4 seconds each:
http://res.cloudinary.com/demo/video/upload/w_700/l_cloudinary_icon,g_north_east,e_brightness:200,o_40,x_5,y_5,w_120/l_text:Roboto_34px_bold:First%20text,co_white,g_west,x_10,eo_3/l_text:Roboto_34px_bold:Second%20text,co_white,g_west,x_10,so_3,eo_6/l_text:Roboto_34px_bold:Third%20text,co_white,g_west,x_10,so_6,eo_9/l_text:Roboto_34px_bold:Fourth%20text,co_white,g_west,x_10,so_9,eo_12/dog.mp4

Such URLs can sometimes grow to be fairly long, and possibly exceed the character limit determined by browsers. This can be solved by using a pre-uploaded subtitles file (SRT) as an overlay for the video clip. This will result in a shorter URL, but the same text overlaid on the video asset.

An example of a pre-uploaded (resource-type:raw) subtitles file:
http://res.cloudinary.com/demo/raw/upload/sample_sub_en.srt

Applying the subtitles file over a video clip is as easy as using one overlay transformation, e.g.:
http://res.cloudinary.com/demo/video/upload/w_700/l_subtitles:sample_sub_en.srt/dog.mp4