[video_player_avplay] Fixed an issue where subtitles for content with pre-roll/insesrted ads in DASH could not be rendered.

[gin7773]

No description provided.

[gemini-code-assist]

Code Review

This pull request updates the caption selection logic in video_player.dart to include start-time checks for both text and picture captions. A logic error was identified in the picture caption implementation where the greater-than operator was used instead of the less-than operator for the start time check, which would cause captions to be hidden incorrectly during their display window.

[gemini-code-assist]

The logic for picture captions uses the wrong operator for the start time check. It should use the less-than operator (<) to hide the caption if the playback position is before the start time. Currently, it uses the greater-than operator (>), which will cause the caption to be hidden as soon as the playback reaches its intended start time.

Suggested change

	position > captions.pictureCaption!.end ||
	position > captions.pictureCaption!.start)
	position > captions.pictureCaption!.end ||
	position < captions.pictureCaption!.start)