Mona,
I don't know what specific video that pka4916 is talking about but I ran a test on a randomly selected Tubi video. The selection pop-up left a lot to be desired with only allowing the selection of the resolution and bitrate. See below.
So, in that respect there is no way to select a sub (other than what is preset in the Settings.) I did the download as shown and had no problem. Listening to the playback I had to actually turn down the volume. It definitely did NOT sound in mono. When I looked at the MediaInfo report I was not surprised to see it was in Stereo because that is my preset. I just don't have the physical room required for a multichannel audio system to sound the way it should. What did surprise me was that there was built into the MKV a subtitle listed as "unknown." My preset for subtitles is "None" since I am an English speaker. When the "unknown" subtitle was turned on on my player, it turned out to be an English (CC).
General
Unique ID : 295450163921782365772915349913874021139 (0xDE45A1BC25005FE8BA34DAF407553B13)
Complete name : R:\AFAB_Out\Tubi\Coyote Ugly.mkv
Format : Matroska
Format version : Version 4
File size : 1.38 GiB
Duration : 1 h 40 min
Overall bit rate : 1 957 kb/s
Movie name : Coyote Ugly
Encoded date : UTC 2022-09-08 00:16:27
Writing application : mkvmerge v68.0.0 ('The Curtain') 64-bit
Writing library : libebml v1.4.2 + libmatroska v1.6.4
Video
ID : 1
Format : AVC
Format/Info : Advanced Video Codec
Format profile : High@L4
Format settings : CABAC / 4 Ref Frames
Format settings, CABAC : Yes
Format settings, Reference : 4 frames
Codec ID : V_MPEG4/ISO/AVC
Duration : 1 h 40 min
Bit rate : 1 829 kb/s
Width : 1 024 pixels
Height : 576 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 : 8 bits
Scan type : Progressive
Bits/(Pixel*Frame) : 0.129
Stream size : 1.29 GiB (93%)
Writing library : x264 core 157
Encoding settings : cabac=1 / ref=4 / deblock=1:0:0 / analyse=0x3:0x113 / me=umh / subme=8 / psy=1 / psy_rd=1.00:0.00 / mixed_ref=1 / me_range=16 / chroma_me=1 / trellis=0 / 8x8dct=1 / cqm=0 / deadzone=21,11 / fast_pskip=1 / chroma_qp_offset=-2 / threads=1 / lookahead_threads=1 / sliced_threads=0 / nr=0 / decimate=1 / interlaced=0 / bluray_compat=0 / constrained_intra=0 / bframes=4 / b_pyramid=2 / b_adapt=2 / b_bias=0 / direct=3 / weightb=1 / open_gop=0 / weightp=2 / keyint=96 / keyint_min=48 / scenecut=0 / intra_refresh=0 / rc_lookahead=40 / rc=crf / mbtree=1 / crf=1.0 / qcomp=0.60 / qpmin=0 / qpmax=69 / qpstep=4 / vbv_maxrate=1800 / vbv_bufsize=1440 / crf_max=0.0 / nal_hrd=none / filler=0 / ip_ratio=1.41 / aq=1:1.00
Default : Yes
Forced : No
Audio
ID : 2
Format : AAC LC
Format/Info : Advanced Audio Codec Low Complexity
Codec ID : A_AAC-2
Duration : 1 h 40 min
Bit rate : 126 kb/s
Channel(s) : 2 channels
Channel layout : L R
Sampling rate : 44.1 kHz
Frame rate : 43.066 FPS (1024 SPF)
Compression mode : Lossy
Stream size : 90.5 MiB (6%)
Default : Yes
Forced : No
Text
ID : 3
Format : UTF-8
Codec ID : S_TEXT/UTF8
Codec ID/Info : UTF-8 Plain Text
Duration : 1 h 38 min
Bit rate : 82 b/s
Frame rate : 0.336 FPS
Count of elements : 1988
Stream size : 59.8 KiB (0%)
Default : No
Forced : No
