chore: show subtitles for videos in full-screen mode

[shafqat-muneer]

LEARNER-10236: iOS - videos do not show captions when viewed full-screen

In the current implementation, subtitles are displayed only in full-screen mode, whether in landscape or portrait orientation. Subtitles are not shown in non-full-screen mode for two reasons. First, we cannot control the default caption on/off option provided by AVPlayer. Second, in normal mode, users can already view captions in any language, making it unnecessary to display additional subtitles. However, in full-screen mode, the option to view captions is unavailable, which is why we ensure subtitles are shown in that mode.

Note: Currently, there is no option to hide subtitles in full-screen mode. To enable this functionality, we would need to design a solution for it or opt for a fully custom implementation by hiding the default AVPlayer control bar.

Demo Downloaded Video	Demo Streaming Video
Demo.Downloaded.Video.mov	Demo.Streaming.Video.mov

[saeedbashir]

@forgotvas It would be nice if you could also look as you did most of the work with videos.

[rnr]

Hello @shafqat-muneer
On both videos you show in the PR description, the previously added subtitles (below the video) stop working (are not highlighted and do not auto-scroll) after exiting full screen mode. Could you please fix it. Thank you

[shafqat-muneer]

Hello @shafqat-muneer On both videos you show in the PR description, the previously added subtitles (below the video) stop working (are not highlighted and do not auto-scroll) after exiting full screen mode. Could you please fix it. Thank you

Hi @rnr,
I was considering that auto-scrolling to the highlighted part might be intentionally disabled, as users may scroll up or down on their own to view previous or upcoming subtitles. If auto-scrolling is enabled, it could interrupt their navigation. I wanted to confirm if this is an intentional implementation. @saeedbashir or @forgotvas can confirm on it.

Once clarified, and if we decide to implement auto-scrolling to the highlighted content, I will handle it in a separate PR since it falls outside the scope of this one.

[rnr]

Hello @shafqat-muneer On both videos you show in the PR description, the previously added subtitles (below the video) stop working (are not highlighted and do not auto-scroll) after exiting full screen mode. Could you please fix it. Thank you

Hi @rnr, I was considering that auto-scrolling to the highlighted part might be intentionally disabled, as users may scroll up or down on their own to view previous or upcoming subtitles. If auto-scrolling is enabled, it could interrupt their navigation. I wanted to confirm if this is an intentional implementation. @saeedbashir or @forgotvas can confirm on it.

Once clarified, and if we decide to implement auto-scrolling to the highlighted content, I will handle it in a separate PR since it falls outside the scope of this one.

@shafqat-muneer I'd like to point out that auto-scrolling now works in the 2U/develop branch (even after exiting fullscreen mode). Why did we decide to disable it? So other words it was working before this PR.

[shafqat-muneer]

@shafqat-muneer I'd like to point out that auto-scrolling now works in the 2U/develop branch (even after exiting fullscreen mode). Why did we decide to disable it? So other words it was working before this PR.

@rnr It seems that the functionality may occasionally work, but not consistently. On the 2U/develop branch, it’s currently not working on my end, whether in portrait or landscape mode. 😕

Landscape	Portrait
Landscape.mp4	Portrait.mp4

[rnr]

@shafqat-muneer I'd like to point out that auto-scrolling now works in the 2U/develop branch (even after exiting fullscreen mode). Why did we decide to disable it? So other words it was working before this PR.

@rnr It seems that the functionality may occasionally work, but not consistently. On the 2U/develop branch, it’s currently not working on my end, whether in portrait or landscape mode. 😕

Landscape Portrait
Landscape.mp4
Portrait.mp4

I see what you mean - yes, it is broken when the user rewinds in fullscreen mode even in 2U/develop - I think we need to create a separate issue for this. Thank you.

[saeedbashir]

LGTM 👍