Opening movies in place (#796) skipped the whole-file bytes #827 read the
track matrix from, so the pool and the probe lost the turn for movies on
disk. stream::movie_header reads just the ftyp and moov boxes (bounded,
positional reads) and both in-place paths derive the orientation from it.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Problem: probe() and MediaPool's movie sources called std::fs::read and then
filmcraft_codecs::open_bytes, so a clip cost its full size in memory, twice
while probing (a 245 MiB MP4 peaked at 494 MiB just to import).
Fix: container footage on disk is opened through a positional-read
ByteReader (stream::FileReader) and FilmCraft's reader openers
(filmcraft_media::reader::open_reader; MP4/MOV, Matroska/WebM, MXF, Ogg,
MPEG-PS/TS), which read the index and then single samples. Probing takes this
path only when nothing probed before containers (still/model extensions,
PSD/SVG/PDF, image magic) claims the file; everything else, whole-file audio
formats, in-memory files (add_bytes) and wasm32 builds keep the byte path.
Regression test: probing and decoding a frame and audio of a movie with a
256 MiB tail grows peak RSS by <64 MiB (512 MiB before), same results.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
