So first, video playback on Chrome is forcing server to transcode subs from SRT to ASS and also sound from EAC3 5.1 to AAC, the video file is 4K HDR10 (HEVC Main 10)
Those transcode is fine for me, but it only trys to transcode sub and sound, I think that causes incorrect playback(black screen with sound and subs), when I manually change bitrate, which trigers video transcode, the playback is normal.