Embeded audio and text tracks switching for mp4 and mkv format videos

[officialmmt]

Hi, I did many searches and code inspections to learn how to deal with "Embedded multiple audio and text tracks switching for mp4 and mkv format videos." I want to process videos from URLs and need to switch these tracks.

I tried something with fluent-ffmpeg to convert videos to HLS format but the video not load fully so I was not able to go back/forward the timeline and also not able to play any of the formats without mp4 type

[welcome]

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