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это наверное от сплиттера зависит

вот mpv открывает поток, в котором 4 видео-дорожки и 4 аудио-дорожки, и выбирает лучший из доступных
и даже дает их переключать

     Video --vid=1 'bitrate 698000' (h264)
     Video --vid=2 'bitrate 1300000' (h264)
     Video --vid=3 'bitrate 1999000' (h264)
 (+) Video --vid=4 'bitrate 3593000' (h264)
     Audio --aid=1 'bitrate 698000' (aac)
 (+) Audio --aid=2 'bitrate 1300000' (aac)
     Audio --aid=3 'bitrate 1999000' (aac)
     Audio --aid=4 'bitrate 3593000' (aac)

ffmpeg при скачивании, наверное, аналогично

а MPC-HC видит только одну аудио и одну видео дорожки

===
PotPlayer видит все дорожки и дает выбирать на лету

(kind of) fixed in rev.96 - in case VLC reports zero source frame rate, SVP will use value from "main.setup.vlc_force_rate"

> Every option with no check for "DXVA" worked well.
...
> I simply deleted the vo and hwdec settings from mpv's custom settings file.

bottom line it's a DXVA decoder issue with Kaby Lake drivers

> I applied the "hwdec=videotoolbox-copy" but mpv still has some bad performance. I think I am giving up on mpv as VLC support seems to be much better on MAC. I can get smooth video but audio desyncs sometimes.
> I want to confirm is this the correct way to apply the arg?

nope, you should enter "--hwdec=videotoolbox-copy" in the player_args option
OR put it right into ~/.config/mpv/mpv.conf

> If almost all Apple hardware even 2016 hardware has bad incompatible processor then what was the motivation making SVP 4 Mac? I am just curious.

yours MB Air with i7-3667U can't handle 1080p because of overheating (temp >100 degrees is not good), NOT because of it's too slow
mine Mini with pretty much the same CPU - i5-4278U - can play 1080p, staying at 75 degrees

and if you read through those two URLs I gave, there's another possible flaw with recent Apple laptops

overall I think that Apple laptops are just "too handsome" to do real job

> what was the motivation making SVP 4 Mac?
well, you know, money

fixed in rev.97

regarding "hwdec", just tested on my Mac Mini, the following works and reduces CPU load:

hwdec=videotoolbox-copy

at which point it crashes? right after playback start, or occasionally after some time?
does it crash with any video file / any video resolution or not?

Try this - https://software.intel.com/en-us/articl … -gadget-20

PMP 1.1.6, Win 10, libmpv 0.21 - work for me

well, at least IPC is working...