Display subtitles from SRT file

[jo-elimu]

Description

If the video comes with subtitles attached, extract the words from the SRT file and display at the bottom of the video.

Sample format:

1
00:00:00,080 --> 00:00:01,680
Akiri Akiri

2
00:00:01,680 --> 00:00:03,520
Akiri

3
00:00:05,640 --> 00:00:08,560
This is number one The special number

4
00:00:08,560 --> 00:00:11,520
one Her shape is like a stick Say

5
00:00:11,600 --> 00:00:14,400
one everyone One, one,

6
00:00:14,400 --> 00:00:16,600
one, one There is one sound

Why?

This feature is needed because subtitles improve learning outcome.

---

• Depends on Add video subtitles webapp#2061

[tuancoltech]

@jo-elimu Can you modify the web app to allow uploading SRT for a video?
http://tgl.elimu.ai/content/multimedia/video/create

[jo-elimu]

@tuancoltech Yes. First, do you know what data format you will be needing implementing subtitles in the Android app? Just a regular .srt text file, or some other format? And perhaps the default Android media player supports the display of subtitles already?

[tuancoltech]

@tuancoltech Yes. First, do you know what data format you will be needing implementing subtitles in the Android app? Just a regular .srt text file, or some other format? And perhaps the default Android media player supports the display of subtitles already?

@jo-elimu We're using ExoPlayer in Android Filamu app. And it does support playing video along with subtitles.
Please refer to the supported subtitle formats here: https://developer.android.com/media/media3/exoplayer/supported-formats#standalone-subtitle (.srt is one of the supported formats, yes)

[jo-elimu]

@tuancoltech Thank you. Yes, looks like this is the exact code we need: https://developer.android.com/media/media3/exoplayer/media-items#sideloading-subtitle-tracks

So then I guess we can just refer to an .srt file stored somewhere on the filesystem.

Added an issue for implementing this in the backend: elimu-ai/webapp#2061

[tuancoltech]

@tuancoltech Thank you. Yes, looks like this is the exact code we need: https://developer.android.com/media/media3/exoplayer/media-items#sideloading-subtitle-tracks

So then I guess we can just refer to an .srt file stored somewhere on the filesystem.

Added an issue for implementing this in the backend: elimu-ai/webapp#2061

@jo-elimu Yes.
Further on this: When we have .srt files provided from backend, we can implement a separate provider for subtitles in content-provider, and links to it via a subtitleId column in Video table.
Then, before playing video we need to load both video data stream and subtitle stream from physical files.