I am trying to download videos of a channel which has subtitle. There are more than thousands files, but only a few has subtitle.
youtube-dl --all-subs -ciw -o "./tmp/%(playlist_index)s - %(title)s.%(ext)s" https://www.youtube.com/watch?v=eVW0Xz85qSA&list=PLElG6fwk_0UmBgC02jKJePx
If I can run a command after every url download, it can be good enough. In this case I will check existence of any subtitle file and decide to keep it or remove it.
maybe --exec is good, but it did not work for me as I expected.
This could be probably done in more elegant way. But it works for me.
First extract urls that have subtitles (replace "playlist_url" with actual url of a playlist, of course)
youtube-dl --write-sub -ij playlist_url | jq -r ".subtitles" \
| grep -Eo "v=[^\&]+" | sort -u > urls.txt \
&& sed -i -e s7^7https:\/\/www\.youtube\.com\/watch\?7 urls.txt
and then download those files with a batch input
youtube-dl -cia urls.txt
* notice that proper playlist_url for channel adress you provided is "https://www.youtube.com/user/SonechkoProject/videos"