MPD Live Stream: Subtitles Skipped When Intervals Are Short

[microka]

Describe the bug
When playing an MPD live stream using the "VideoPlayer MPD/M3U8/M3U/EPG" extension, subtitles are intermittently skipped. Specifically, if the time interval between the end of one subtitle cue and the beginning of the next is very short, the second subtitle cue often fails to display. The subtitle cue after the skipped one will then appear correctly later. This results in missing dialogue or information conveyed through subtitles. This issue does not occur when playing the identical stream URL with other media players; they display all subtitles sequentially as expected.

To Reproduce
Steps to reproduce the behavior:

1. Open the following M3U playlist URL using the extension.

#EXTM3U

#EXTINF:-1 tvg-id="jade" tvg-name="jade", jade
#KODIPROP:inputstream.adaptive.manifest_type=mpd
#KODIPROP:inputstream.adaptive.license_type=clearkey
#KODIPROP:inputstream.adaptive.license_key={"keys": [{"kty": "oct", "k": "LS/XsWYbHijeOCaIcrSEgA", "kid": "CVi5xldiLEZaYgXrIlK47Q"}], "type": "temporary"}
http://edgeware-live.edgeware.tvb.com/__cl/slocalr43/__c/ott_J_hevc/__op/cenc_m/__f/index.mpd?sig=f23e45b805d3c4103619adb5871b65e2&ext_start_limit=1743627610&int_start_limit=1743627610&ts=1743627610&c=339313918

2. Ensure playback starts and select the subtitle track.
3. Wait for or seek (using time-shifting) to a program segment that contains subtitles. Note: Subtitles are optional and only present during certain programs on this channel.
4. Observe the subtitle display carefully, paying attention to moments with rapid dialogue or quick transitions between subtitle cues.
5. Notice instances where a subtitle line disappears, and the immediately following line (which should appear very quickly) is skipped, with the next line appearing later.

Desktop (please complete the following information):

• OS: Windows 11
• Browser: Google Chrome (Version 134.0.6998.166, Stable, 64-bit)
• Version: 8.27.1.40205

Additional context

• The provided stream URL is time-sensitive and will expire. I will update the issue with a new URL if it becomes invalid.

• Reproducing the issue requires finding a program segment on the live stream that actively uses subtitles.