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* media: look up the track of each traf in a hash map * media: bound Matroska indexing by a file-wide frame budget Every indexed frame claims its stored bytes and at least one, so fixed-size laces of empty frames cannot describe more frames than the file has bytes. The frame count across tracks is capped at 2^26, the TrackEntry count at 2^16, and blocks find their track through a hash map. * media: keep the spec spellings of Colour, ColourSpace and colourPrimaries * media: PCM chunks stay bounded in MOV and MP4 The writer ends a PCM chunk at 1 MiB or half a second, and returns an error past 2^32 - 1 samples in a track instead of clamping the stsz count. The reader splits a PCM chunk above 16 MiB into several samples, so files from writers without chunk limits read whole past 4 GiB. A sparse output lets the tests write past 4 GiB, which also exercises the writer's co64 path. * media: clamp max_lace_frames to 256 and round BlockDuration * media: level-1 Matroska elements read at most the file's length in all SeekHead entries pointing at nested elements made each one read the rest of the file. * media: set_sample_entry rejects a codec change * media: the mux oracle compares stream counts before streams * ci: media checkout does not persist credentials * media: README lists the renames from FilmCraft and the output that differs on valid input * media: rustfmt * media: the stream count comparison leaves out timecode streams * media: PCM chunks end at 1 MiB only, as ffmpeg's do ffmpeg's PCM chunks run past half a second, so a duration limit split remuxed chunks the source kept whole. * media: frames and samples indexed scale with the file's length Matroska indexes at most one frame per 8 bytes of file and ISO BMFF at most one sample per 4 bytes, beyond the first 2^20 of each, so the sample tables stay within about ten times the file's size. Empty fixed-size laces and one-byte constant-size samples could make them 40 to 76 times its size. * media: clamp the frame and sample allowances