support for youtube 3d videos

[siddht4]

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Make sure you are using the latest version: run youtube-dl --version and ensure your version is 2016.10.26. If it's not read this FAQ entry and update. Issues with outdated version will be rejected.

• I've verified and I assure that I'm running youtube-dl 2016.10.26

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• [x ] At least skimmed through README and most notably FAQ and BUGS sections
• [x ] Searched the bugtracker for similar issues including closed ones

What is the purpose of your issue?

• Bug report (encountered problems with youtube-dl)
• Site support request (request for adding support for a new site)
• [x ] Feature request (request for a new functionality)
• Question
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The following sections concretize particular purposed issues, you can erase any section (the contents between triple ---) not applicable to your issue

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If the purpose of this issue is a bug report, site support request or you are not completely sure provide the full verbose output as follows:

Add -v flag to your command line you run youtube-dl with, copy the whole output and insert it here. It should look similar to one below (replace it with your log inserted between triple ```):

$ youtube-dl -v <your command line>
[debug] System config: []
[debug] User config: []
[debug] Command-line args: [u'-v', u'http://www.youtube.com/watch?v=BaW_jenozKcj']
[debug] Encodings: locale cp1251, fs mbcs, out cp866, pref cp1251
[debug] youtube-dl version 2016.10.26
[debug] Python version 2.7.11 - Windows-2003Server-5.2.3790-SP2
[debug] exe versions: ffmpeg N-75573-g1d0487f, ffprobe N-75573-g1d0487f, rtmpdump 2.4
[debug] Proxy map: {}
...
<end of log>

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If the purpose of this issue is a site support request please provide all kinds of example URLs support for which should be included (replace following example URLs by yours):

• Single video: https://www.youtube.com/watch?v=BaW_jenozKc
• Single video: https://youtu.be/BaW_jenozKc
• Playlist: https://www.youtube.com/playlist?list=PL4lCao7KL_QFVb7Iudeipvc2BCavECqzc

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Description of your issue, suggested solution and other information

Explanation of your issue in arbitrary form goes here. Please make sure the description is worded well enough to be understood. Provide as much context and examples as possible.
If work on your issue requires account credentials please provide them or explain how one can obtain them.

i want to download 3d videos from youtube , but youtube-dl doesnt seem to extract them.
so add 3d videos support too

youtube-dl -v https://www.youtube.com/watch?v=DUVHSS5yaUw -F
[debug] System config: []
[debug] User config: []
[debug] Command-line args: [u'-v', u'https://www.youtube.com/watch?v=DUVHSS5yaUw', u'-F']
[debug] Encodings: locale UTF-8, fs UTF-8, out UTF-8, pref UTF-8
[debug] youtube-dl version 2016.10.26
[debug] Python version 2.7.12 - Linux-4.4.0-21-generic-x86_64-with-LinuxMint-18-sarah
[debug] exe versions: ffmpeg 2.8.8-0ubuntu0.16.04.1, ffprobe 2.8.8-0ubuntu0.16.04.1
[debug] Proxy map: {}
[youtube] DUVHSS5yaUw: Downloading webpage
[youtube] DUVHSS5yaUw: Downloading video info webpage
[youtube] DUVHSS5yaUw: Extracting video information
[youtube] DUVHSS5yaUw: Downloading MPD manifest
[info] Available formats for DUVHSS5yaUw:
format code extension resolution note
249 webm audio only DASH audio 60k , opus @ 50k (48000Hz), 759.82KiB
250 webm audio only DASH audio 89k , opus @ 70k (48000Hz), 1013.80KiB
140 m4a audio only DASH audio 127k , m4a_dash container, mp4a.40.2@128k (44100Hz), 1.82MiB
171 webm audio only DASH audio 142k , vorbis@128k (44100Hz), 1.91MiB
251 webm audio only DASH audio 224k , opus @160k (48000Hz), 2.41MiB
160 mp4 256x144 DASH video 110k , avc1.4d400c, 13fps, video only, 1.56MiB
278 webm 256x144 DASH video 131k , webm container, vp9, 13fps, video only, 1.53MiB
242 webm 426x240 DASH video 185k , vp9, 25fps, video only, 2.03MiB
133 mp4 426x240 DASH video 251k , avc1.4d4015, 25fps, video only, 3.51MiB
243 webm 640x360 DASH video 342k , vp9, 25fps, video only, 3.69MiB
134 mp4 640x360 DASH video 423k , avc1.4d401e, 25fps, video only, 4.16MiB
244 webm 854x480 DASH video 562k , vp9, 25fps, video only, 5.97MiB
135 mp4 854x480 DASH video 762k , avc1.4d401e, 25fps, video only, 7.89MiB
247 webm 1280x720 DASH video 971k , vp9, 25fps, video only, 10.44MiB
136 mp4 1280x720 720p 1272k , avc1.4d401f, 25fps, video only, 14.52MiB
248 webm 1920x1080 DASH video 1701k , vp9, 25fps, video only, 18.64MiB
137 mp4 1920x1080 1080p 2018k , avc1.640028, 25fps, video only, 26.32MiB
298 mp4 1280x720 DASH video 2101k , avc1.4d4020, 50fps, video only, 26.60MiB
299 mp4 1920x1080 DASH video 4305k , avc1.64002a, 50fps, video only, 49.08MiB
17 3gp 176x144 small , mp4v.20.3, mp4a.40.2@ 24k
36 3gp 320x180 small , mp4v.20.3, mp4a.40.2
43 webm 640x360 medium , vp8.0, vorbis@128k
18 mp4 640x360 medium , avc1.42001E, mp4a.40.2@ 96k
22 mp4 1280x720 hd720 , avc1.64001F, mp4a.40.2@192k (best)

[dstftw]

It's not a 3D video.