do not convert pts/dts of prerolled samples
decoder: fixed ES_OUT_SET_NEXT_DISPLAY_TIME implementation (improved seek)
         proper handling of DISCONTINUITY
         reset video picture heap on seek/pause/rate change (avoid old
         pictures)
Please report any regression.

(I do not reset timestamp on purpose, it will at least break demuxer using
packetizer)

* Added Loop and Repeat methods in /TrackList
* Added GetMetadata method in /Player
* Fixed "length" metadata item to fit the spec (It should be expressed
        in seconds)

Sharpen performance improvement by precalculating some values. Patch by Jérémy DEMEULE, author of the filter.

* src/input/input.c: don't use input_EsOutDiscontinuity() on pause for now since this isn't properly supported by decoders yet and can thus corrupt the decoded stream.

vlcInstance reference in MediaControl object (patch by Jan David Mol)

vlc_instance pointer to MediaControl object
by Jan David Mol)

by Jan David Mol)

Revert back mp4 r20330 !

* prefer playlist item's meta title over its name, if available. This work-arounds a rare bug: VLC sometimes tends to show a previous item's name instead of the current one.

* revert the rewrite of MP4_GETSTRINGZ in the previous commit, as strnlen is a GNU-extension and therefore unavailable on Mac OS X and other platforms. I think this way is easier than writing an own implementation for OSX, but feel free to tell me otherwise. (closes #1213)

Fixed a few invalid access on broken files.
Fixed compilation warnings.