Are the parameters for www.youtube.com/watch documented?

Question

The youtube watch page can accept a staggeringly high number of parameters, but various Google searches on the topic only resulted in every blogger and their dog announcing the #t quasi-parameter for linking to a specific moment.

Is there an at least partial but official documentation on the parameters www.youtube.com/watch accepts?

Answer 1

An attempt to provide the basic queries available for YouTube urls.

Usage: http://www.youtube.com/watch?[Queries]

v=

The v parameter specifies the VIDEO_ID. This field contains an 11-character value that YouTube uses to uniquely identify a video. You can find the video ID for a video in the URL of the web page where you watch that video.

&fmt=

The fmt parameter specifies the return format for the video resolution

&t=

The t parameter allows for deep-linking in the form of #t=1m15s

&hl=

The hl parameter prompts the user(host) to a specific the indicated language

Chinese (Traditional) &hl=zh-TW
Czech &hl=cs-CZ
Dutch &hl=nl-NL
English (Great Britain, Ireland, Australia and New Zealand) &hl=en-GB
English (United States and Canada)* default value &hl=en-US
French &hl=fr-FR
German &hl=de-DE
Italian &hl=it-IT
Japanese &hl=ja-JP
Korean &hl=ko-KR
Polish &hl=pl-PL
Portuguese (Brazil) &hl=pt-BR
Russian &hl=ru-RU
Spanish (Spain) &hl=es-ES
Spanish (Mexico) &hl=es-MX
Swedish &hl=sv-SE

&gclid=

The gclid parameter is used in auto-tagging for Google Ad Words and will show up in the landing page URL when a user arrives at the page from the ad.

&feature=

The feature parameter is assigned within Youtube to describe certain videos and where display

&feature=watch_response

Any videos in response to a video will have this parameter linked to it. (Assigned within youtube)

&feature=watch_response_rev

The reverse of the above. The "child" video page will have a link to the "parent" page (Assigned within youtube)

&feature=pyv

Promoted Youtube Video (pyv) on a watch page (Must be entered within Google AdWords Editor destination url)

?feature=pyv

Promoted Youtube Video (pyv) on a channel page (Must be entered within Google AdWords Editor destination url)

&kw=

The kw parameter is an indication of keyword insertion. Keyword insertion is an advanced feature that can help make an ad more relevant to a diverse audience. Each time the ad shows, AdWords will automatically replace the code with the keyword that triggered the ad. (Must be entered within Google AdWords Editor destination url)

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Unfinished section

&ad= Advertisement Id assigned to an advertisement ?
&feature=recent_shows
&feature=recentu
&feature=recentlik Recently Liked ?
&feature=spotlight
&feature=related
&feature=channel
&feature=branded
&feature=aso
&feature=sub
&feature=fvw
&feature=fvwk
&feature=fvhl
&feature=BF
&feature=topvideos
&feature=more_related
&feature=list_related
&feature=player_embedded
&feature=artistob
&playnext=[1 or 0]
&list=[LIST_ID]
&list=QL Queue List ?
&index=[INDEX_NO] Index of list
&shuffle=
&videos=
&playnext_from=
&force_ap=

_{Sources
How can I link to a youtube video at a specific point in the video?
http://youtube-global.blogspot.com/2008/10/link-to-best-parts-in-your-videos.html
http://en.wikipedia.org/wiki/YouTube#Quality_and_codecs
http://code.google.com/apis/youtube/2.0/reference.html#Localized_Category_Lists
http://www.google.com/support/adwordseditor/bin/answer.py?hl=en&answer=57752
http://adwords.google.com/support/aw/bin/answer.py?hl=en&answer=74996}

Answer 2

This isn't an offical link but there plenty of tips and tricks here.

You might want to try the Official API page for further information.

Answer 3

Since Youtube removed the button to show all the videos from an uploader, this might come in useful.

If you use the parameter &list=UL you'll get a playlist with all the uploaded videos from that particular channel.

That's very useful when you're watching though older videos, and don't want to have to go to the channel and click "show more" a bunch of times every time you'll want to resume from where you got to.

This way you can bookmark the page and resume from that point later. The parameter watch?v=[VIDEO_ID] defines where you've gotten to in the playlist.

Example

http://www.youtube.com/watch?v=[VIDEO_ID]&list=UL