Translate subtitles (captions) option

[beltex]

First off, thanks for the awesome project! :)

I’m running into a case were the video in question only has subtitles in a single language and no automatic captions. YouTube provides the option to automatically translate the subtitles to another language (Translate captions option under settings). Adding the option to invoke the auto-translator for subtitles would be handy.

From an options perspective, one possibility could be that when --sub-lang is invoked, if the desired language is not available natively, then the auto-translator is used. Otherwise, something like a --sub-trans option could be added.

[jaimeMF]

You can use the --write-auto-sub option, for example: youtube-dl '8YoUxe5ncPo' --write-auto-sub --sub-lang 'es,it'

[beltex]

That doesn't work in my case though unfortunately. As mentioned, the video doesn't have automatic captions, it only has subtitles in a single language (which I want to invoke translate on). Thus, the following is output (using the above commands)

WARNING: Video doesn't have automatic captions

[phihag]

@beltex Can you post the full output you get when you run youtube-dl with -v? I suspect that you're either using an outdated verison or not using the example video that @jaimeMF mentioned.

[beltex]

@phihag I’m running the latest version, installed via Homebrew yesterday. The example given by @jaimeMF is different than my case, it has automatic captions, but no subtitles. Here's my case:

$ youtube-dl -v --write-auto-sub --sub-lang en https://www.youtube.com/watch?v=Ky9eprVWzlI
[debug] System config: []
[debug] User config: []
[debug] Command-line args: ['-v', '--write-auto-sub', '--sub-lang', 'en', 'https://www.youtube.com/watch?v=Ky9eprVWzlI']
[debug] Encodings: locale UTF-8, fs utf-8, out UTF-8, pref UTF-8
[debug] youtube-dl version 2014.12.17.2
[debug] Python version 2.7.5 - Darwin-13.4.0-x86_64-i386-64bit
[debug] exe versions: ffmpeg 2.2.4, ffprobe 2.2.4
[debug] Proxy map: {}
[youtube] Ky9eprVWzlI: Downloading webpage
[youtube] Ky9eprVWzlI: Extracting video information
[youtube] Ky9eprVWzlI: Looking for automatic captions
[youtube] Ky9eprVWzlI: Downloading XML
WARNING: Video doesn't have automatic captions
[youtube] Ky9eprVWzlI: Downloading DASH manifest
[debug] Invoking downloader on u'https://r8---sn-gvbxgn-tt1z.googlevideo.com/videoplayback?mm=31&key=yt5&expire=1419457043&id=o-ACK96ozbPuoVz8ziDXZCGk8ZKazQ4P_XiO_2xtxW1hLy&initcwndbps=2102500&ipbits=0&sparams=dur%2Chightc%2Cid%2Cinitcwndbps%2Cip%2Cipbits%2Citag%2Cmime%2Cmm%2Cms%2Cmv%2Cratebypass%2Crequiressl%2Csource%2Cupn%2Cexpire&mv=m&hightc=yes&ms=au&requiressl=yes&source=youtube&ratebypass=yes&sver=3&mt=1419435379&signature=92E2FF0EEAE8DF328C26F32DA8FA563CC8D7ADD9.36BDA6B7EE5EE45FB515B93EBC77187FC7D72BDB&ip=&dur=2665.418&mime=video%2Fmp4&itag=18&fexp=900718%2C904833%2C927622%2C932404%2C9405911%2C943917%2C945091%2C946008%2C947209%2C947218%2C947602%2C948124%2C949427%2C952302%2C952605%2C952901%2C955301%2C957103%2C957105%2C957201%2C959701&upn=Fn1XE-UIMcI'
[download] Ky9eprVWzlI.mp4 has already been downloaded

[jaimeMF]

It will work in the next version, thanks for the report.

As you have seen, not posting even the url makes it really hard to give good answers or fix the issue.

[beltex]

Awesome, thank you very much @jaimeMF!

My apologies, I will make sure to do so next time! :)