multiyoutube

Maybe this one can be counted as a tool to mashup? Though its original intent is for educational purpose.

Interpretations of variables

Variable	Default value	Units
start	An array of 0	Second
end	An array of Infinity	Second
current	0	Second

Each element of the array start and end is used to specify the interval of the respective video you want to play within.

The variable current is used to save your watching progress.

Example

https://ntvy95.github.io/multiyoutube/#!?youtube=q0LILXfwhdk,9UUPEo849_s&start=40,2&end=59.25732426303855,22.561&current=10

Let's break down the above URL:

youtube	start	end	current
q0LILXfwhdk	40	59.25732426303855	10
9UUPEo849_s	2	22.561

The first time you click Play button, the two youtube videos q0LILXfwhdk and 9UUPEo849_s will be played, starts from the second 40+10 and 2+10, respectively and ends at the second 59.25732426303855 and 22.561, respectively.

If you click Stop button, the two videos will be ready to play starting from the second 40 and 20, respectively.

In Stop mode (before you click the Play button for the first time and right after you click the Stop button), you are able to adjust the variable start by tuning time slider of each video. There is no way to adjust the variable end on the website, you have to manually set it for your self as I do not think the usage of end is common.

You can use the Get URL button to save and share your combination (in youtube, start, end) along with your watching progress (in current).

For the purpose of sharing, you may want to manually delete the part &current=10 from the retrieved URL.