alpha blending broken on Android / SSA subtitles
SSA subtiles are not appearing properly in VLC for android. I'm facing this issue since last 6-7 months. Here is the sample info as given by Mediainfo:
General
Unique ID : 245266110294539071929189907607656083031 (0xB88488DC977F46C7366BAF69A1C02E57)
Complete name : /home/jj/Videos/NCED - Driver - KANABOON (1).mkv
Format : Matroska
Format version : Version 4 / Version 2
File size : 23.9 MiB
Duration : 5 min 35 s
Overall bit rate : 598 kb/s
Movie name : NCED - Driver - KANABOON
Encoded date : UTC 2018-08-13 05:52:48
Writing application : mkvmerge v25.0.0 ('Prog Noir') 64-bit
Writing library : libebml v1.3.6 + libmatroska v1.4.9 / Lavf57.75.100
Attachments : ufonts.com_vadims-writing.ttf
Video
ID : 1
Format : HEVC
Format/Info : High Efficiency Video Coding
Format profile : Main@L3@Main
Codec ID : V_MPEGH/ISO/HEVC
Duration : 4 min 34 s
Bit rate : 601 kb/s
Width : 720 pixels
Height : 480 pixels
Display aspect ratio : 1.85:1
Frame rate mode : Constant
Frame rate : 23.976 (24000/1001) FPS
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Bits/(Pixel*Frame) : 0.073
Stream size : 19.6 MiB (82%)
Writing library : x265 2.6:[Linux][GCC 5.4.0][64 bit] 8bit+10bit+12bit
Encoding settings : cpuid=1173503 / frame-threads=3 / wpp / no-pmode / no-pme / no-psnr / no-ssim / log-level=2 / input-csp=1 / input-res=720x480 / interlace=0 / total-frames=0 / level-idc=0 / high-tier=1 / uhd-bd=0 / ref=4 / no-allow-non-conformance / no-repeat-headers / annexb / no-aud / no-hrd / info / hash=0 / no-temporal-layers / open-gop / min-keyint=24 / keyint=240 / bframes=4 / b-adapt=2 / b-pyramid / bframe-bias=0 / rc-lookahead=25 / lookahead-slices=0 / scenecut=40 / no-intra-refresh / ctu=64 / min-cu-size=8 / rect / no-amp / max-tu-size=32 / tu-inter-depth=1 / tu-intra-depth=1 / limit-tu=0 / rdoq-level=2 / dynamic-rd=0.00 / no-ssim-rd / signhide / no-tskip / nr-intra=0 / nr-inter=0 / no-constrained-intra / strong-intra-smoothing / max-merge=3 / limit-refs=3 / limit-modes / me=3 / subme=3 / merange=57 / temporal-mvp / weightp / no-weightb / no-analyze-src-pics / deblock=0:0 / sao / no-sao-non-deblock / rd=4 / no-early-skip / rskip / no-fast-intra / no-tskip-fast / no-cu-lossless / no-b-intra / no-splitrd-skip / rdpenalty=0 / psy-rd=2.00 / psy-rdoq=1.00 / no-rd-refine / analysis-reuse-mode=0 / no-lossless / cbqpoffs=0 / crqpoffs=0 / rc=abr / bitrate=600 / qcomp=0.60 / qpstep=4 / stats-write=0 / stats-read=2 / cplxblur=20.0 / qblur=0.5 / ipratio=1.40 / pbratio=1.30 / aq-mode=1 / aq-strength=1.00 / cutree / zone-count=0 / no-strict-cbr / qg-size=32 / no-rc-grain / qpmax=69 / qpmin=0 / no-const-vbv / sar=255 / sar-width / : / sar-height=16:13 / overscan=0 / videoformat=5 / range=0 / colorprim=1 / transfer=1 / colormatrix=1 / chromaloc=0 / display-window=0 / max-cll=0,0 / min-luma=0 / max-luma=255 / log2-max-poc-lsb=8 / vui-timing-info / vui-hrd-info / slices=1 / no-opt-qp-pps / no-opt-ref-list-length-pps / no-multi-pass-opt-rps / scenecut-bias=0.05 / no-opt-cu-delta-qp / no-aq-motion / no-hdr / no-hdr-opt / no-dhdr10-opt / analysis-reuse-level=5 / scale-factor=0 / refine-intra=0 / refine-inter=0 / refine-mv=0 / no-limit-sao / ctu-info=0 / no-lowpass-dct / refine-mv-type=0 / copy-pic=1
Default : Yes
Forced : No
Color range : Limited
Color primaries : BT.709
Transfer characteristics : BT.709
Matrix coefficients : BT.709
Audio [#1](https://code.videolan.org/videolan/vlc/-/issues/1)
ID : 2
Format : Opus
Codec ID : A_OPUS
Duration : 4 min 34 s
Bit rate : 64.0 kb/s
Channel(s) : 2 channels
Channel positions : Front: L R
Sampling rate : 48.0 kHz
Frame rate : 16.670 FPS (2879 SPF)
Compression mode : Lossy
Delay relative to video : -22 ms
Stream size : 2.08 MiB (9%)
Writing library : Lavc57.100.102 libopus
Language : Japanese
Default : Yes
Forced : No
Audio [#2](https://code.videolan.org/videolan/vlc/-/issues/2)
ID : 3
Format : Opus
Codec ID : A_OPUS
Duration : 4 min 34 s
Bit rate : 64.0 kb/s
Channel(s) : 2 channels
Channel positions : Front: L R
Sampling rate : 48.0 kHz
Frame rate : 16.670 FPS (2879 SPF)
Compression mode : Lossy
Delay relative to video : -22 ms
Stream size : 2.06 MiB (9%)
Writing library : Lavc57.100.102 libopus
Language : Japanese
Default : No
Forced : No
Text
ID : 4
Format : ASS
Codec ID : S_TEXT/ASS
Codec ID/Info : Advanced Sub Station Alpha
Duration : 5 min 33 s
Bit rate : 138 b/s
Count of elements : 61
Compression mode : Lossless
Stream size : 5.63 KiB (0%)
Writing library : Lavc57.100.102 ssa
Language : English
Default : Yes
Forced : No
Edited by François Cartegnie