Brandon ThomasandClaude Opus 5.5
59bf7cc21f
A tiny header naming ~1000 channels on a 64M-pixel line sized each chunk buffer at hundreds of GB and Vec::with_capacity aborted the process. Chunks over 256 MB are refused, and the RLE / zlib buffers reserve with try_reserve_exact. Regression test: huge_scan_lines_are_refused_before_allocating. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
6.2 KiB
6.2 KiB
File format parity
Last reviewed: 2026-10-10 · Last updated: 2026-10-10 · Change: major (new file: every file type Premiere Pro 26.5.2 reads or writes, against ours) · Target: Adobe Premiere Pro 2026 (26.5.2) and Media Encoder 2026
Containers, stills, audio files, project and interchange files, captions and presets. Codecs inside
the containers are in codec-parity.md. Our import list is
filmcraft_media::{VIDEO,AUDIO,STILL}_EXTENSIONS plus the openers in filmcraft_codecs::openers();
our export list is filmcraft_export::Format. Premiere's list is from Adobe's supported-formats
documentation and the exporter folders in the installed bundle's MediaIO/systempresets (names
only). "Tested" names the evidence.
Project and interchange
| Format | Premiere | Read | Write | Tested | % |
|---|---|---|---|---|---|
Premiere project .prproj |
native | no | no | — | 0% (G2) |
Our project .fcproj |
— | yes, schema migrations | yes, atomic, auto-save, recovery journal | migration tests | — |
FCP7 XML (xmeml) |
read + write | yes | yes | round-trip tests; Premiere-exported XML slow (#461) | 75% |
| FCPXML | read (via XtoCC) | yes | yes | round-trip tests | 80% |
| AAF (Edit Protocol) | read + write | yes | yes (embedded / linked / consolidated) | own CFB; never opened in Media Composer / Pro Tools | 55% |
| OMF 2.0 | write | no | yes | never opened in Pro Tools | 50% |
| EDL (CMX 3600) | read + write | yes | yes | tests | 85% |
| OpenTimelineIO | read + write (26.0) | yes | yes | tests | 80% |
| Avid Log Exchange (ALE) | write | no | yes | — | 70% |
| Marker CSV / text | write | — | yes (#454) | — | 80% |
| Selection as project | Premiere project | — | .fcproj only |
— | 50% |
Templates (.prproj templates) |
yes | — | our templates | — | 70% |
Motion Graphics templates .mogrt |
read + write | refused by design (clean-room, AGENTS.md §1); our .fcgt instead |
.fcgt |
— | n/a |
Effect presets .prfpset |
read + write | no | our JSON presets | — | 40% |
Keyboard shortcuts .kys |
read + write | no | our presets incl. a Premiere layout | — | 60% |
Export presets .epr |
read + write | no | our presets (import / export) | — | 50% |
LUTs .cube, .3dl |
read | yes (1D / 3D / shaper) | — | tetrahedral CPU = WGSL | 95% |
Video containers
| Container | Premiere | Read | Write | Tested | % |
|---|---|---|---|---|---|
| MP4 / M4V / 3GP | read + write | yes | yes (H.264, HEVC + AAC) | ffprobe, round trips | 90% |
| QuickTime MOV | read + write | yes | yes (H.264, HEVC, ProRes, DNxHR, APV, MJPEG, PCM) | ffprobe | 90% |
| MXF OP1a / OP-Atom | read + write (XDCAM, AVC-Intra, P2, AS-10 / AS-11, JPEG 2000, DNx) | yes (AVC, DNx, ProRes, MPEG-2, PCM / AES3, timecode) | OP1a (DNxHR, ProRes, H.264), OP-Atom | index-table seeking tests | 70% |
MPEG TS / PS (AVCHD .mts, .m2ts, .ts, .mpg, .vob, .mod) |
read; write MPEG-2 / Blu-ray / DVD | yes | no | fixtures | 65% |
| Matroska / WebM | read (limited) | yes (H.264, HEVC, VP9, AV1, ProRes, MJPEG + AAC, Opus, FLAC, MP3, Vorbis, PCM); WebM black report (#432), MKV multi-audio (#601) | no | fixtures; audio sample-aligned with the encoded signal (#790) | 75% |
| AVI | read + write | no (extension listed, no demuxer, #598) | no | — | 0% |
| WMV / ASF | read; write on Windows | no | no | — | 0% |
| FLV / F4V | read + write | no | no | — | 0% |
| DCP | write (Wraptor) | no | no | — | 0% |
| APV raw / Y4M | — | yes | APV in MOV | — | ahead |
| Ogg (Opus / Vorbis) | — | yes | no | granule-seek tests | ahead |
| Camera folder structures (XDCAM, P2, AVCHD, Canon XF, RED) | Media Browser reads them | AVCHD files yes; spanned clips and metadata no | — | — | 30% |
Stills and image sequences
| Format | Premiere | Read | Write (frame / sequence) | % |
|---|---|---|---|---|
| PNG, JPEG, TIFF, BMP, GIF | read + write | yes | PNG / TIFF / BMP / JPEG sequences, GIF | 90% |
| WebP | — | yes | no | ahead |
| PSD (layers as sequence) | read (layered) | no | — | 0% |
| OpenEXR | read + write | stills and sequences: scan-line, none / RLE / ZIPS / ZIP, half / float / uint, RGB(A) or Y, kept as linear float (#828); no PIZ, PXR24, B44, DWA, tiled, multi-part or deep | sequences (half float, linear RGB / premultiplied RGBA; uncompressed, RLE, ZIPS or ZIP; #806, #874) | 70% |
| DPX | read + write | yes: luma / RGB / RGBA, 8–16-bit, filled 10/12-bit, either byte order (#821); packed 10/12-bit, Y'CbCr 4:2:2 / 4:4:4 with or without alpha (#841); no RLE | sequences (10-bit RGB, BT.709; #779) | 90% |
| Targa | read + write | yes: every image type, RLE, colour maps, 15–32-bit (#821) | sequences (24-bit, 32-bit with alpha; #779) | 95% |
| HEIF / HEIC | read | no | — | 0% |
| Radiance HDR, AI / EPS, ICO, PTL | read | no | — | 0% |
Audio files
| Format | Premiere | Read | Write | % |
|---|---|---|---|---|
| WAV / BWF (timecode, iXML partial) | read + write | yes | yes | 90% |
| AIFF / AIFC | read + write | yes | yes | 95% |
| MP3 | read + write | read | no | 60% |
| AAC / M4A | read + write | yes | yes (in MP4 / MOV, and AAC Audio: .m4a or ADTS .aac, #814) |
95% |
| FLAC, Ogg, Opus | partial | yes | no | ahead on read |
| WMA | read (Windows) | no | no | 0% |
Captions and subtitles
| Format | Premiere | Read | Write | Tested | % |
|---|---|---|---|---|---|
| SRT, WebVTT, SCC | read + write | yes | yes | frame-exact, property-tested | 95% |
| MCC (608 + 708), EBU STL, TTML / IMSC1, DFXP | read + write | yes | yes | frame-exact | 90% |
| 608 / 708 embedded in the video stream | write (MXF, H.264 SEI) | no | no | — | 0% |
| Burn-in | yes | — | yes | golden tests | 95% |
Summary
File formats dimension: ~60%, 140–240 h (codecs counted separately). The beta blocker is
.prproj. After it, by user impact: AVI and WMV import, EXR / PSD stills, AAF / OMF
validation in Avid and Pro Tools, DVD / Blu-ray / DCP / broadcast MXF delivery.
Revision history
| Date | Change | Summary |
|---|---|---|
| 2026-10-10 | major | Created: format-by-format comparison with Premiere 26.5.2 from the import / export registries, crate READMEs, the installed bundle's exporter listings and open issues |