fix: reverse playback – Android HEVC rotation & AVErrorInvalidVideoComposition

[hm21]

Summary

This branch fixes two bugs that caused reverse playback to fail.

---

1. Android – HEVC video rotation ignored during reversal

Problem: On Android, HEVC-encoded videos with a rotation metadata tag (e.g. 90°) were not correctly rotated when played in reverse. The reversed output appeared sideways or upside-down.

Fix: Applied the rotation matrix from the video's MediaFormat when writing reversed frames, so the output matches the original orientation.

---

2. iOS / macOS – AVErrorInvalidVideoComposition (-11841) during reverse playback

Problem: After AudioReverser was introduced, exporting a reversed clip failed with:

AVFoundationErrorDomain Code=-11841 "The video could not be composed."

Root cause: AudioReverser decodes audio to PCM at 44 100 Hz and produces a WAV file with duration PCMFrameCount / 44100. This value is typically a few microseconds longer than the video clip duration (which is quantised to the video frame timescale). Inserting the WAV into the AVMutableComposition audio track extended composition.duration beyond the coverage of the AVVideoComposition instructions, which is forbidden by AVFoundation.

Fix: Clamp the inserted WAV range to clipDuration using CMTimeMinimum in VideoSequenceBuilder.swift (both iOS and macOS):

// Clamp the WAV duration to clipDuration.
// AudioReverser produces PCM frames at 44 100 Hz, so
// reversed.duration (= PCMFrameCount/44100) is rarely
// equal to clipDuration (video frames / fps). Even a
// few microseconds of overhang extend composition.duration
// beyond the AVVideoComposition instruction coverage,
// triggering AVErrorInvalidVideoComposition (-11841).
let clampedDuration = CMTimeMinimum(reversed.duration, clipDuration)
let wavRange = CMTimeRange(start: .zero, duration: clampedDuration)
try sharedAudioTrack.insertTimeRange(wavRange, of: wavTrack, at: insertStart)

---

Files changed

File	Change
android/…/VideoReverser.kt	Apply HEVC rotation matrix during frame reversal
ios/Classes/…/AudioReverser.swift	New: PCM-level audio reversal for iOS
macos/Classes/…/AudioReverser.swift	New: PCM-level audio reversal for macOS
ios/Classes/…/VideoSequenceBuilder.swift	Clamp reversed WAV duration to clipDuration
macos/Classes/…/VideoSequenceBuilder.swift	Clamp reversed WAV duration to clipDuration
macos/Classes/…/RenderVideo.swift	Remove temporary debug logging