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Generally, they use an extra track within the video file to carry the URLs.
This may or may not be part of the official specification for the various formats (most container formats permit tracks containing arbitrary data). A given player may or may not support this, and would almost certainly permit the user to turn them off.
Most of the video sharing sites convert your uploaded video to a site-common format. In the process, they will remove the URLs, since they just extract the video and audio tracks from your upload and then convert to their site-common format.
Again.I want to make clickable link on video and to post it on many video sites.
Again, that isn't going to work.
I simply explained, to satisfy everyone's curiosity, how this is possible in some limited cases.
The major sites all convert your video to a common format. (For example, YouTube converts to .flv.) In the process of doing that conversion, they are going to throw away your URLs, because they extract the video and audio tracks, ignoring anything else.
The only way this would work would be on video sites that simply store your upload unchanged. I don't know any major site that does that.
As an example, QuickTime supports this. But when you upload a QuickTime video to YouTube, etc. they extract the video and audio tracks, and convert to .FLV. The hotspots are in another track. Your URLs get left on the floor.
I've seen myspace profiles with clickable link, so is it difference between videos on myspace profile and myspace video?
Myspace users are able to insert any HTML they want into their profiles. That would include embedding videos that are hosted elsewhere. Or placing layers over videos hosted either at Myspace or on other sites.
I'd imagine one or more sites offer widgets and hosting space for doing this.
Examine the HTML source for the profiles where you see this being done, and that should tell you where they are hosting, what kind of video format, etc.
Why youtube, myspace want to ignore url.What are their interests?
They may or may not want to ignore URLs.
I think, though, the main reason is twofold:
(1) They need to convert from many video/audio codecs/container formats to their site-standard format. (In the case of YouTube, .flv). Most container formats permit the inclusion of arbitrary data in addition to video and audio tracks for all sorts of purposes. In many cases, they simply don't know what this data might represent, and, in any case, don't care.
(2) It's not a feature that is universally or even widely supported between different formats and on different players.
Is it possible to accept url in somecases(example: paying them money)?
YouTube has been experimenting with ways to monetize the site by inserting ads of one kind or another into videos. I believe they have experimented with an additional area that appears at the bottom of the video for the first few seconds.
Why not make a proposal to them?