Chrome bug: Playing merged stream has a frozen frame segment

[Lirianer]

Problem Description

When merging multiple video streams, using Algora.Admin.merge_streams added in #76, into a single stream, a playback glitch occurs when playing the resulting .m3u8 in Chrome specifically after the #EXT-X-DISCONTINUITY tag.

The video freezes after the tag for the duration of the segment that follows, it then plays correctly. Video evidence by @zcesur , the glitch occurs at 0:46. The frame freezes showing the first frame of the second segment after the discontinuity tag

https://github.com/user-attachments/assets/c6ac7829-4963-4c07-9b32-708410b84512

Repro steps

• Run project
• Start streaming twice to create 2 different videos
• Execute Algora.Admin.merge_streams/1 with the created videos
• Reproduce resulting video in Chrome

Attempted solutions

• Experimented with adding and removing various tags in the .m3u8 files, both Master Playlist and Playlist
  • Experimented with removing #EXT-X-PROGRAM-DATE-TIME tags.
  • Tried replacing datetime tags with daterange tags.
• Tried different values for existing tags.
• Attempted reversing the order of segments after the discontinuity tag.
• Tested with multiple video players including videojs and vidstack.
• Used Apple's mediastreamvalidator tool to identify potential issues in the playlist.

Possible investigation

• Investigate if using MPEG-TS segments and/or separate A/V track
• When researching I've come across something mentioning keyframes at the start of the segments, I'm not very familiar with video formats but maybe something is missing or is redundant and causes the behaviour