This is my MP4 playing code.

This started out as an effort to learn more about the MP4 format.  I
ended up swiping codec code from ffmpeg; it needed fairly little
hackery to adapt it to my framework.

The ffmpeg code was licensed under the LGPL v2.1 "or (at your option)
any later version".  I dislike v3 enough that for my derivative works,
I've removed the later-version option.  (I dislike v2 as well, for
reasons this is not an appropriate place to go into, but, as the
copyright notices say, I decided accepting it was the lesser price.)  I
was careful to preserve any "Copyright (year) by (entity)" notices when
updating the license terms.

There are a handful of files that are entirely my work; they are in the
public domain.  (In jurisdictions where it is not possible for a
copyright owner to deliberately release a work into the public domain,
this should be interpreted as the closest available approximation,
probably something like "you have an unlimited license to use this file
any way you see fit".)  At this writing, these are: Makefile,
codecintf.c, codecintf.h, dump.c, mp4.c, mp4.h, and play.c.  Taking a
relatively distinctive string (such as "ffmpeg and modified") from the
stereotyped copyright-notice header and using a tool such as grep to
identify files which do not contain it is a reasonable way to find such
files.  There are also a very few files which are under some other
license; the only example at this writing is jrevdct.c - if the license
for any particular file matters to you, look at that file.

This code is definitely deficient in some respects; notably, it is very
restricted in what codecs it supports, and play makes some grossly
nonportable assumptions about the X server it's talking to.  It needs
more attention to synchronizing video and audio and it badly needs more
of a user interface than it's got.

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