Thanks for the pointing out the issues. My current inquiry is actually
unrelated to OLPC but since there might be some overlap it's useful to
know these issues. What libraries/frameworks would you recommend using?
You mention GStreamer, how mature is it?
Jim Gettys wrote:
> Here be licensing dragons, folks, at a minimum when you go from one
> codec to N codecs.
> Be very careful on the selection of multimedia codec frameworks, as
> they get you into licensing hades more often than not, and many people
> don't see it coming.
> Here's the problem:
> You want to plug in a commercial licensed codec into a codec framework,
> to get at a patented algorithm (of which there are many in the media
> area, and software patents cannot, unfortunately, just be ignored,
> despite most of our beliefs the current system is badly broken)
> But the license of the framework's codec interface has terms that
> conflict with the commercial codec's license terms (typically around
> patent issues).
> Net result: no legal combination.
> This may be ok from an end user's point of view when they put their
> system together out of pieces, as they usually ignore the legal
> problems, but it is a showstopper for re-distributors (e.g. Linux
> distributions, OLPC downstream consumers), who might like/need things to
> work "out of the box" for the end user.
> As an example of lack of care about this is the Xine player libraries,
> which would have been perfectly adequate several years before the
> gstreamer library was built. Gstreamer was explicitly written and care
> taken in its licensing to allow for such combinations to be possible,
> and arguably would not have been necessary had the licensing issue been
> thought through in advance (it was infeasible to get Xine's libraries
> re-licensed, due to the number of contributors).
> I have no information about mplayer's licensing situation.
> Once burned (actually, free software has been burned multiple times on
> this topic), twice shy. Please be *very* careful in this area so you
> (and we) don't get burned too.
> Best regards,
> - Jim