I save thumbnail. subtitle is not appear




MediaInfo

General
Unique ID : 98542588349362187832023627913658597158 (0x4A229CB72B6A434A37885D44EE477F26)
Complete name : Z:E1 - Gojo Satoru.mkv
Format : Matroska
Format version : Version 4
File size : 525 MiB
Duration : 23 min 55 s
Overall bit rate : 3 067 kb/s
Frame rate : 23.976 FPS
Description : Packed by Bilibili XCoder v2.0.2
Writing application : Lavf60.3.100
Writing library : Lavf60.3.100
ErrorDetectionType : Per level 1

Video
ID : 1
Format : HEVC
Format/Info : High Efficiency Video Coding
Format profile : Main@L5.1@Main
Codec ID : V_MPEGH/ISO/HEVC
Duration : 23 min 55 s
Width : 3 840 pixels
Height : 2 160 pixels
Display aspect ratio : 16:9
Frame rate mode : Constant
Frame rate : 23.976 (23976/1000) FPS
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Default : Yes
Forced : No
Color range : Limited
Color primaries : BT.709
Transfer characteristics : BT.709
Matrix coefficients : BT.709
VENDOR_ID : [0][0][0][0]

Audio
ID : 2
Format : AAC LC
Format/Info : Advanced Audio Codec Low Complexity
Codec ID : A_AAC-2
Duration : 23 min 55 s
Channel(s) : 2 channels
Channel layout : L R
Sampling rate : 48.0 kHz
Frame rate : 46.875 FPS (1024 SPF)
Compression mode : Lossy
Default : Yes
Forced : No
VENDOR_ID : [0][0][0][0]

Text
ID : 3
Format : ASS
Codec ID : S_TEXT/ASS
Codec ID/Info : Advanced Sub Station Alpha
Duration : 23 min 54 s
Compression mode : Lossless
Language : ENG
Default : No
Forced : No