#171644111 - Resume playback

[nitinl-cogapp]

PT: #171644111 - Resume playback

[neilh-cogapp]

Is there a URL where I can have a look at this?

[nitinl-cogapp]

Yep: https://dev.video.hammer.cogapp.com/

[neilh-cogapp]

This works nicely. Good work.

Couple of things:

1. I haven't really looked into this, but are there any potential performance issues with updating localStorage every time timeupdate fires? This event is fired every 15-250ms during playback according to the videojs docs! I am thinking more on mobile where this might potentially increase battery usage?

2. I thought it would be a nice UX addition to add an overlay on top of the player to signpost to users "Resume or Restart?" if the app finds a local storage item. (this might be a separate story enhancement depending on how much work is involved)

[nitinl-cogapp]

Re 1, I did look into this and MDN suggests that the user agent manages this:

The event frequency is dependent on the system load, but will be thrown between about 4Hz and 66Hz (assuming the event handlers don't take longer than 250ms to run). User agents are encouraged to vary the frequency of the event based on the system load and the average cost of processing the event each time, so that the UI updates are not any more frequent than the user agent can comfortably handle while decoding the video.

Re 2, good idea, seems easy enough so I'll take a look as part of this PR.

[neilh-cogapp]

Re 1, I did look into this and MDN suggests that the user agent manages this:

The event frequency is dependent on the system load, but will be thrown between about 4Hz and 66Hz (assuming the event handlers don't take longer than 250ms to run). User agents are encouraged to vary the frequency of the event based on the system load and the average cost of processing the event each time, so that the UI updates are not any more frequent than the user agent can comfortably handle while decoding the video.

I was thinking more along the lines of is it performant to call localStorage.set() every few milliseconds given it's a file I/O operation? Perhaps it is, but would it be better to write the value only every second for example?

[nitinl-cogapp]

I found mixed things on how resource intensive it actually is, but agree that it's overkill to do so frequently.

I've added an interval with 4b1945f which updates localstorage once per second.

I've updated the preview too: https://dev.video.hammer.cogapp.com