- 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
New L0 crate filmcraft-flac, a FLAC encoder written from RFC 9639:
constant / verbatim / fixed / LPC subframes (Levinson-Durbin on Tukey-
windowed autocorrelation, up to order 12), partitioned Rice residuals,
left/side, side/right and mid/side stereo, CRC-8/CRC-16, STREAMINFO with
MD5 (RFC 1321, own implementation), levels 0-8, all lossless.
Export:
- Format::Flac, an audio-only .flac (16/24-bit), streamed one second at
a time like WAV/AIFF; STREAMINFO is rewritten at the end with frame
sizes, total samples and MD5. Preset "FLAC 48 kHz 24-bit".
- AudioCodec::Flac in MP4 and QuickTime (fLaC + dfLa), one frame per
sample with the short last frame timed exactly; the dfLa STREAMINFO
is replaced before the moov is written (Mp4Writer::set_sample_entry).
MXF stays PCM.
- AudioSettings::flac_level (default 5); Export panel: FLAC (lossless)
audio format and Compression Level; file.exportMedia `format: "flac"`,
`audioCodec`, `flacLevel`. Spanish and Japanese strings.
ffmpeg oracle: every stream decodes bit-exactly with the STREAMINFO MD5
equal to ffmpeg's hash; .flac and FLAC-in-MP4/MOV exports decode to the
same samples as a WAV export of the range.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude
JordyUSA