mpv does not autoload subtitles from folder set by --sub-file-paths when playing from youtube

[krem]

mpv version and platform

mpv 0.27.0+git10~xenial1
LinuxMint 18

Reproduction steps

For example, I have downloaded (by youtube-dl) vtt subtitles (auto-generated) from https://www.youtube.com/watch?v=L_uW0_OvEkk
$ ls /tmp
The Future of Trucking.vtt

Playing video from youtube mpv misses local subtitles
$ mpv --no-terminal --msg-level=all=debug --log-file=/tmp/log --sub-file-paths=/tmp https://www.youtube.com/watch?v=L_uW0_OvEkkv=L_uW0_OvEkk

Expected behavior

mpv should autoload local subtitles playing youtube URL as it does for local mp4
Downloaded mp4 file works fine
$ mpv --no-terminal --msg-level=all=debug --log-file=/tmp/log --sub-file-paths=/tmp "The Future of Trucking.mp4"

mpv recognizes subtitles
[ 0.100][v][find_files] Loading external files in /tmp/
[ 0.100][d][find_files] Potential external file: "The Future of Trucking.vtt" Priority: 3

Actual behavior

playing URL, though mpv sets right video title
[ 1.784][v][cplayer] Set property: file-local-options/force-media-title="The Future of Trucking" -> 1

but does not recognize subtitles name
[ 1.980][v][find_files] Loading external files in /tmp
[ 1.980][d][find_files] Potential external file: "The Future of Trucking.vtt" Priority: 0

Log file

https://ptpb.pw/VTH-

Sample files

https://www.youtube.com/watch?v=L_uW0_OvEkk

[wiiaboo]

Can you test with 0.28 or git?

[wiiaboo]

Nevermind, I can reproduce it with git master.

[wiiaboo]

Right, it doesn't use the media-title when searching for subtitles, it uses the filename. So you'd have to name your subtitles watch?v=l_uw0_ovekk.vtt for them to be autodetected.

[krem]

So mpv force us to rename "The Future of Trucking" to "watch?v=l_uw0_ovekk"? it is very "meaningful" name. It's ridiculous to have a bunch of such filenames in the folder for youtube videos with auto-generated subtitles - how do you discern them?
Why just not make mpv friendlier and for playing URL just match title?

[wiiaboo]

It's not meaningful for many "web" URLs, you mean. For local files with the same title (quite common) it wouldn't make sense.

[kevmitch]

a bunch of such filenames in the folder for youtube videos

This is a pretty weird use case. Why not just download the whole video with youtube-dl if you have a folder of stuff for them already?

[wiiaboo]

Or just use --ytdl-raw-options=write-sub=,write-auto-sub=,sub-lang=en and mpv will load them from youtube-dl directly, unless you're modifying them yourself locally.

[krem]

I just wanted mpv to peek up manually downloaded auto-generated subtitles from --sub-file-paths folder.
I have tried --ytdl-raw-options=write-sub=,write-auto-sub= but in case on youtube there are both static and auto-generated subtitles it seems mpv does not load auto-generated, but only static one.

[wiiaboo]

Can you give an example url?

[krem]

This video has both static and auto-generated subs, loaded is only static one.
$ mpv --ytdl-raw-options=write-auto-sub=,write-sub=,sub-lang=en https://www.youtube.com/watch?v=MhVw-MHGv4s
It seems that youtube-dl does not fetch both subs
$ youtube-dl --skip-download --write-sub --write-auto-sub -- https://www.youtube.com/watch?v=MhVw-MHGv4s
[youtube] MhVw-MHGv4s: Downloading webpage
[youtube] MhVw-MHGv4s: Downloading video info webpage
[youtube] MhVw-MHGv4s: Extracting video information
[youtube] MhVw-MHGv4s: Looking for automatic captions
[info] Writing video subtitles to: How a Retractable Ballpoint Pen Works-MhVw-MHGv4s.en.vtt
One downloaded, and it's static one.

[wiiaboo]

It seems to be a youtube-dl "issue" where it doesn't give us auto-generated subs if there already exists non-generated for that language.

[krem]

ok, could you please point me how to make easier playing youtube with auto-generated and other subs available? Is there some scripting method I could tell mpv to pick up auto-generated subs? or at least auto-save subs as ...watch?v=[...] for --sub-file-paths autoloading.

[wiiaboo]

Don't use write-sub= then, only write-auto-sub=.

[ghost]

any one able to load subtitles from youtube. Tried this

mpv  --ytdl-raw-options=write-auto-sub=,sub-lang=en  https://www.youtube.com/watch?v=MhVw-MHGv4s

but nothing seems to work also tried this youtube video also https://www.youtube.com/watch?v=pHxlZ4dTXug

[wiiaboo]

@potholiday Works fine here. With --no-config you also need --slang=en for it to auto-choose that subtitle, but it's there anyway.

[ghost]

@wiiaboo yep worked; Thank you

mpv --no-config --slang=en -ytdl-raw-options=write-auto-sub=,sub-lang=en  https://www.youtube.com/watch?v=pHxlZ4dTXug