- Include `resolvedWebcamVideoUrl` in the dependency arrays for
`captureProjectThumbnail` and `handleExport` so thumbnail capture and
export settings stay in sync when the webcam URL refreshes.
- Clear `VideoMuxer.streamSink` before awaiting `closeIpcExportStream`
in `finalize()` to close the race where a concurrent `destroy()` →
`abortStream()` could try to close the same stream ID a second time.
Long recordings (35-minute screencaps were the motivating case) fail at
the 99% "Finalizing" step with a RangeError once the muxed MP4 would
exceed V8's ~2 GiB per-ArrayBuffer limit. Both export paths accumulate
the whole file in renderer memory and round-trip it through IPC, so no
output size past that point can complete:
- Legacy: src/lib/exporter/muxer.ts uses mediabunny's BufferTarget,
which holds the entire MP4 in a single ArrayBuffer. finalize() → Blob
→ blob.arrayBuffer() → ipcRenderer.invoke('write-exported-video-to-
path', arrayBuffer, path) — every step wants a ≥2 GiB contiguous
allocation.
- Lightning: native-video-export-finish did fs.readFile(finalizedPath)
and shipped the bytes back to the renderer, which re-serialized them
again. Same ceiling.
This change moves the finished MP4 across the renderer↔main boundary
via a temp file instead of an ArrayBuffer:
- New electron/ipc/export/exportStream.ts manages streaming temp files
via fh.write(buf, 0, len, position) so out-of-order writes (moov box
rewrites, etc.) stay safe. Each session lives in a 0700 mkdtemp()
directory opened with O_CREAT | O_EXCL so a hostile local user on a
shared tempdir cannot pre-plant a symlink at the predicted path.
- New renderer-facing IPCs: export-stream-open/write/close,
finalize-exported-video (renames temp to final path, copy+unlink
fallback on EXDEV/EPERM/ENOTEMPTY with console.warn on leaked bytes),
mux-exported-video-audio-from-path (FFmpeg audio fallback that takes
a path instead of an ArrayBuffer), and discard-exported-temp. Every
handler validates the caller-supplied path against an owned-export-
paths registry before touching disk, so a compromised renderer cannot
route arbitrary filesystem paths into main-process deletes/moves.
- The muxer now picks mediabunny's StreamTarget automatically when the
Electron bridge is available (BufferTarget stays for tests and any
non-Electron callers). finalize() returns { mode, tempFilePath,
bytesWritten } or { mode, blob } so the exporter can branch.
- Exporters forward tempFilePath through ExportResult. Lightning's
finish returns the ffmpeg temp path directly; the FFmpeg audio
fallback forks on the muxer result type. modernVideoExporter's
Lightning success branch now accepts tempFilePath (previously it
checked blob only, which regressed every native export).
- VideoEditor.tsx dispatches on tempFilePath: finalize via the new IPC,
keep the temp in place when the save dialog is canceled so "Save
Again" still works without re-rendering, keep the pending-save entry
alive on non-canceled save failures, and discard the temp on unmount
or explicit clear. GIF and smoke-test code paths still use the
legacy Blob path unchanged.
- app.on('before-quit') also reaps any open streaming sessions via
cleanupAllExportStreams().
Chunk size is 16 MiB — well under Electron/Mojo IPC message limits
while keeping total writes low (~160 for a 2.5 GB export).
Tested locally: exported a 35:13 source (~2.7 GiB H.264 input) at
Original 1920×1080 + Balanced. Previously failed on finalize with a
RangeError; with this patch the Legacy pipeline produced a valid 3.7
GiB MP4 whose ffmpeg -i duration/streams match the source.
Addresses #194.
- Change ?? 99 fallback to ?? 100 in finalizing progress label
- Add editor.export.processingAudioEdits i18n key to all 5 locales
- Tighten sourceTimeToOutputTime return type to number (was number|null)
- Remove now-unused totalOutputDurationMs param from scheduleRegionForChunk
- Remove ?? fallbacks at call sites (function always returns a number)
- Fall back to video container duration when mainBuffer is null but
audioRegions are present (prevents empty output)
- Use data.numberOfChannels as deinterleave stride instead of capped
dataChannels (fixes garbled audio for 5.1+ sources)
- Fix .coderabbit.yaml: '*' is not valid regex, use '.*'
- Add encoderError check after awaiting pendingMuxing to prevent
finalization of corrupt exports (both exporters)
- Remove unreachable synchronous fast-path in getMediaDurationSec
- Set preload='metadata' before src for correct browser behavior
- Localize audio processing status text with t()
Major rewrite of the audio export pipeline for stability and memory efficiency:
## Streaming Decode
- Primary decode path uses WebDemuxer + AudioDecoder (WebCodecs streaming)
- Falls back to bulk decodeAudioData if streaming fails
- Avoids holding full compressed file + decoded PCM simultaneously
## Chunked Offline Rendering
- Processes timeline in 30-second OfflineAudioContext chunks
- Memory bounded to ~30s of PCM per chunk regardless of recording length
## Chunked WAV Writing
- Writes PCM in ~256KB chunks instead of single massive ArrayBuffer
- Eliminates OOM for long recordings on the native/FFmpeg export path
## Chunked Encoding
- Single AudioEncoder kept alive across all chunks (clean AAC stream)
- Proper backpressure and error propagation per chunk
## scheduleBufferThroughTimeline chunk windowing
- Clips source nodes to chunk boundaries for correct cross-chunk audio
- Backwards compatible defaults when no chunk params provided
## Other export fixes
- Progress cap: 99% -> 100% in both exporters and UI
- Muxing errors: propagated instead of silently swallowed
- Mac recording: enhanced warning when no audio files for muxing
- Export timeout: eliminated by removing real-time rendering
- IPC get-local-media-url now checks both fs.realpath and path.resolve forms
against approvedLocalReadPaths, so symlinks approved via approveUserPath work
- Extract duplicated sync correction parameters into shared constants in
audioEncoder.ts (SYNC_SEEK_THRESHOLD_SEC, SYNC_PLAYBACK_RATE_OPTIONS)
- Fix telemetry drift reset: use nextExpectedMs - now for delay instead
of stale drift value after baseline reset (avoids 1ms rapid sample)
- Use RECORDER_TIMESLICE_MS for mic fallback recorder (was hardcoded 1000)
- Return requested timeMs in extensionHost getCursorAt boundary clamps
- Remove premature null of webcam URL to prevent flicker on path change
- Use fs.realpath in IPC get-local-media-url to match media server check
- Replace setInterval with drift-compensating recursive setTimeout for
cursor sampling. Under CPU load setInterval bunches or skips callbacks,
creating irregular gaps in telemetry data.
- Add binary search + linear interpolation to export cursor lookup
(modernFrameRenderer) matching the playback path. Was using O(n)
nearest-neighbor which caused visible cursor jumping in exports.
- Apply same interpolation fix to extension API getCursorAt().
- Always route audio through aresample=async=1:first_pts=0 filter during
muxing on both macOS and Windows, even when duration delta is small.
Previously skipped when delta ≤50ms, which left progressive clock drift
(from CPU load) completely uncorrected.
- Lower sync detection threshold from 50ms to 20ms so tempo correction
kicks in earlier.
- Use explicit 48kHz AudioContext sample rate in both browser recording
and export rendering to prevent sample rate mismatch drift.
- Reduce MediaRecorder timeslice from 1000ms to 250ms to reduce chunk
loss under CPU pressure.
- Tighten export audio sync: seek threshold 300ms→150ms, tolerance
15ms→8ms, correction window 2s→0.5s, max adjustment ±8%→±12%.
- Lower companion audio start delay threshold from 50ms to 25ms.
- Integrate extension render hooks into frameRenderer and modernFrameRenderer
- Add modernFrameRenderer for compositing extensions during export
- Wire extension audio processing in audioEncoder
- Support extension hooks in gif and video export paths
- Extension loader with manifest validation, ID sanitization, and path traversal protection
- Permission-gated runtime API (render, cursor, audio, timeline, ui, assets, export)
- Extension host with lifecycle management (activate/deactivate)
- Marketplace client for browsing, downloading, and installing extensions
- Extension Manager UI panel with enable/disable/uninstall
- IPC bridge for extension discovery, management, and marketplace operations
- Proxy guard on window.electronAPI to block extension access to privileged IPC
- Zip-slip protection via post-extraction directory traversal validation
- Safe PowerShell invocation for Windows zip extraction (no string interpolation)
- File URL resolution with path escape prevention
Align decoded frame timestamps with the media timeline so trimmed exports do not end early on recordings whose video stream starts after the container timeline.
Instead of freezing at 'Finalizing 99%' while audio renders in real-time,
the export UI now shows 'Rendering audio XX%' with a live progress bar and
an explanatory note about why real-time playback is required.
Progress is reported every 250ms from the RAF tick loop in AudioProcessor
and piped through VideoExporter to the UI via the existing onProgress callback.
The zoom spring animation in both frameRenderer and modernFrameRenderer
was using performance.now() (wall-clock time) to compute spring deltas.
During export, wall-clock time and content time are decoupled — a frame
representing 33ms of video may render in 3ms or 500ms. This caused zoom
animations to appear choppy/laggy in exports while previews were smooth.
Switched to content-time deltas (timeMs) so the spring advances at the
same rate as the video regardless of actual render speed.
Also bumps version to 1.1.20.
webadderall