- AudioSettings gains `float`; `bits` takes 16, 24 or 32. `SampleFormat` (Int16 / Int24 /
Int32 / Float32) and `ExportSettings::supports_sample_format` decide what each codec and
container stores: WAV, AIFF and QuickTime PCM all four, MXF integers, FLAC integers.
`validate` refuses float without 32 bits and float in FLAC or MXF.
- WAV float is WAVE_FORMAT_IEEE_FLOAT (EXTENSIBLE for more than two channels) with a `fact`
chunk; AIFF float is AIFF-C `fl32`; QuickTime float is `lpcm` with the float flag; MXF writes
32-bit integers. Float keeps the mix as it is, peaks above 0 dBFS included; 16 and 24 bit
write the same bytes as before.
- FLAC encoder: 8-32 bits. 32-bit stereo is coded independently (a side channel would need 33
bits), the sample range check no longer overflows, and 32-bit frames point at STREAMINFO for
the size, which symphonia 0.5 (FilmCraft's own FLAC import) and ffmpeg both read.
- Export mode: Sample Size shows 16 bit, 24 bit, 32 bit and 32 bit float like Audio Format
does, greying out what the format cannot store with the reason on hover; a size that stops
being available (float after switching to FLAC) becomes 32-bit integer. es, fr, pt-br, id,
ja and zh-cn strings.
- Tests: writer layouts and ffprobe codecs for every new format, round trips through ffmpeg
and FilmCraft's own readers in WAV, AIFF, MOV, MXF and FLAC, headroom of a +6 dB tone,
refused combinations, full-scale 32-bit FLAC through ffmpeg (MD5 too) and symphonia, and a
UI test of the selector.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_015nzevSsTNZxHPpUngfGTAw
Premiere writes a stereo clip to FCP7 XML as two mono clip items on two
tracks (sourcetrack trackindex 1 and 2). The importer already picks
channel 0 and channel 1 for them, but left both centred, and a centred
one-channel clip plays on both sides. So both channels summed on L and
on R: +3 dB per channel for an uncorrelated stereo effect (and its L-R
doubled), +6 dB for dual-mono dialogue.
Import: a clip that plays one channel of a split two-channel file is
panned to that channel's side (channel 0 left, channel 1 right). An
Audio Pan filter on the clip item still overrides it.
Export: a one-channel clip always writes its Audio Pan, also when it is
centred, so a centred Breakout to Mono round-trips centred.
Measured with filmcraft-cli (import, export WAV): a split stereo file
and a split dual-mono file now come out at 0.00 dB and sample-identical
to the source (before: +3.01 dB and +6.02 dB per channel); a mono file
on a mono track was and stays at 0 dB.
Tests (crates/interchange/tests/fcp7.rs):
split_stereo_halves_are_panned_to_their_side and
split_stereo_half_keeps_its_audio_pan fail without the import change;
centred_mono_breakout_round_trips_centred fails without the export
change.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_012HrAqZmrrDLRpxBJatxvaJ
The OPFS recovery snapshot (apps/filmcraft-web) had two problems:
- #197: opfs::write never reported failures, and Autosave recorded the
revision as snapshotted before the write ran. A failed write was only
retried after the next edit.
- #193: the first tick of a clean session wrote {"dirty": false} to the
meta. Starting with ?norecover or ?fresh therefore discarded a
snapshot that was never reopened.
The decision of when to snapshot or mark clean moves to a pure module,
recovery_policy, tested natively in tests/recovery_policy.rs. Failed
writes (snapshot or clean meta) are retried after the 5 s interval
without another edit, and the meta is only marked clean to retire a
snapshot this session wrote. opfs::write_then reports whether a queued
write landed (coalesced writes report the newest one's result).
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_012HrAqZmrrDLRpxBJatxvaJ
Claude