I recommend using potplayer to play this video and HEVC in general: https://potplayer.daum.net if you use potplayer by default it has an audio normalizer on, this ruins the audio, to disable it Shift + N inside the player THIS IS A NATIVE 4K, NOT RE-SCALEED OR NOTHING OF THAT, IS NOT DOWNLOADED FROM YOUTUBE.  Unique ID : 188764959256555652490659602970233017159 (0x8E02CF0A21510422AD5DEF6B4D701347) Complete name : [ShukaShuu] Twice - Feel Special 4K HEVC 10Bits Flac 48KHz 24Bits [Multi-Subs].mkv Format : Matroska Format version : Version 4 File size : 1.63 GiB Duration : 3 min 38 s Overall bit rate mode : Variable Overall bit rate : 64.3 Mb/s Encoded date : UTC 2019-12-30 22:47:07 Writing application : mkvmerge v37.0.0 ('Leave It') 64-bit Writing library : libebml v1.3.9 + libmatroska v1.5.2 Cover : Yes Encoding Gui : Hybrid 2019.08.26.1 Video ID : 1 Format : HEVC Format/Info : High Efficiency Video Coding Format profile : Main 10@L5@Main Codec ID : V_MPEGH/ISO/HEVC Duration : 3 min 38 s Bit rate : 62.4 Mb/s Width : 3 840 pixels Height : 2 160 pixels Display aspect ratio : 16:9 Frame rate mode : Constant Frame rate : 23.976 (24000/1001) FPS Color space : YUV Chroma subsampling : 4:2:0 Bit depth : 10 bits Bits/(Pixel*Frame) : 0.314 Stream size : 1.59 GiB (97%) Writing library : x265 3.1+11-de920e0a3183:[Windows][GCC 9.2.0][64 bit] 10bit Language : Korean Default : Yes Forced : Yes Color range : Limited Matrix coefficients : BT.709 Audio ID : 2 Format : FLAC Format/Info : Free Lossless Audio Codec Codec ID : A_FLAC Duration : 3 min 26 s Bit rate mode : Variable Bit rate : 1 932 kb/s Channel(s) : 2 channels Channel layout : L R Sampling rate : 48.0 kHz Frame rate : 11.722 FPS (4095 SPF) Bit depth : 24 bits Compression mode : Lossless Delay relative to video : 6 s 560 ms Stream size : 47.6 MiB (3%) Writing library : libFLAC 1.3.1 (UTC 2014-11-25) Language : Korean Default : Yes Forced : Yes Text #1 ID : 3 Format : UTF-8 Codec ID : S_TEXT/UTF8 Codec ID/Info : UTF-8 Plain Text Duration : 2 min 49 s Bit rate : 87 b/s Count of elements : 56 Stream size : 1.80 KiB (0%) Language : Japanese Default : No Forced : No Text #2 ID : 4 Format : UTF-8 Codec ID : S_TEXT/UTF8 Codec ID/Info : UTF-8 Plain Text Duration : 2 min 49 s Bit rate : 221 b/s Count of elements : 56 Stream size : 4.57 KiB (0%) Language : Hindi Default : No Forced : No Text #3 ID : 5 Format : UTF-8 Codec ID : S_TEXT/UTF8 Codec ID/Info : UTF-8 Plain Text Duration : 2 min 49 s Bit rate : 76 b/s Count of elements : 56 Stream size : 1.59 KiB (0%) Language : English Default : Yes Forced : No Text #4 ID : 6 Format : UTF-8 Codec ID : S_TEXT/UTF8 Codec ID/Info : UTF-8 Plain Text Duration : 2 min 49 s Bit rate : 72 b/s Count of elements : 56 Stream size : 1.49 KiB (0%) Language : Chinese Default : No Forced : No Text #5 ID : 7 Format : UTF-8 Codec ID : S_TEXT/UTF8 Codec ID/Info : UTF-8 Plain Text Duration : 2 min 49 s Bit rate : 110 b/s Count of elements : 56 Stream size : 2.28 KiB (0%) Language : Vietnamese Default : No Forced : No Text #6 ID : 8 Format : UTF-8 Codec ID : S_TEXT/UTF8 Codec ID/Info : UTF-8 Plain Text Duration : 2 min 49 s Bit rate : 81 b/s Count of elements : 56 Stream size : 1.68 KiB (0%) Language : Spanish Default : No Forced : No