Containers vs. Codecs
A container (.mp4, .mov, .mkv, .webm, or a folder of image files) wraps your media so other software can open it. A codec defines how the video inside that container is compressed.
Sequency chooses the correct container for each codec: H.264 and HEVC export to .mp4, ProRes exports to .mov, MKV (VP9) exports to .mkv, WebM (VP9 with Opus audio) exports to .webm, and an Image Sequence output creates a numbered folder of PNG, TIFF, OpenEXR, Targa, JPEG, WebP, HEIC or AVIF files.
MXF is supported for input when macOS can decode the embedded codec (for example, ProRes OP1a), and Sequency can route several MXF variants through its custom readers when AVFoundation cannot ingest them directly.
Blackmagic RAW (.braw, .braw2) is an input-only format in Sequency. The app decodes it through the bundled Blackmagic RAW SDK, then exports through standard video or image-sequence outputs such as ProRes, PNG, and OpenEXR. ARRI clips work the same way. See Camera RAW: Blackmagic RAW and ARRI.
H.264 (AVC)
Widely supported and efficient. Pick H.264 for previews, client reviews, or web uploads. Quality is controlled by the Bitrate setting; increase it when the footage contains fast motion or fine detail. H.264 does not carry alpha in Sequency.
HEVC (H.265)
Delivers similar quality to H.264 at roughly 30–50% smaller file sizes. Requires modern playback hardware (macOS 10.13+, iOS 11+, many recent TVs). Avoid if your audience uses older systems. Like H.264, quality follows the Bitrate setting.
ProRes 422
An Apple mezzanine codec designed for editorial workflows. It balances high fidelity with manageable file sizes and is ideal for round-tripping between professional NLEs. Its data rate is fixed by the codec, so the Bitrate card is not shown.
ProRes 4444
The highest-quality ProRes flavor with support for alpha channels. Turn on Preserve Alpha Channel in the Quality card when the source has transparency. Choose this for compositing, VFX, or archival masters where color precision matters most.
MKV (VP9)
A royalty-free alternative that writes a .mkv file. It uses the Bitrate card and a Speed choice (Quality, Balanced, Fast, Realtime). MKV output has no audio, and it is not available when the source is an MKV, MXF, Blackmagic RAW, or ARRI clip.
WebM and AV1
WebM output uses VP9 video (8-bit, or 10-bit for HDR PQ and HLG) and Opus audio. WebM and MKV inputs can contain VP9, AV1, H.264 or HEVC video; AV1 decodes in hardware on Macs that support it and in software elsewhere.
Image Formats
WebP supports lossy or lossless output, alpha, and embedded ICC profiles. HEIC and AVIF output are available when the current macOS Image I/O runtime provides a destination writer. JPEG XL input is available when the current runtime provides a working native reader.
Animated WebP output supports loops, frame timing, and alpha where the format permits; animation output does not include audio. GIF files remain supported as inputs.
Image Sequence Formats
An Image Sequence output exports each frame as a separate image. Use it when your downstream pipeline expects numbered frames. Choose an empty destination folder with enough disk space; if the folder already has files, Sequency asks before overwriting.
- PNG — Lossless, 8-bit or 16-bit, with alpha.
- TIFF — 8-bit or 16-bit, with alpha.
- OpenEXR — High-dynamic-range frames for compositing. Pick a compression such as Zip (Block), PIZ, or DWAA. Supports alpha.
- Targa — Simple 8-bit format, with alpha.
- JPEG — Small lossy frames with a Quality slider. No alpha.
- WebP — Lossy or lossless, with alpha.
- HEIC / AVIF — Small lossy frames with a Quality slider, when this Mac can write them.
Alpha Channel Support
Alpha can be preserved in ProRes 4444, Animated WebP, and in PNG, TIFF, Targa, OpenEXR, WebP, HEIC and AVIF sequences. H.264, HEVC, MKV, WebM, and JPEG output do not keep alpha.
Blackmagic RAW and ARRI Controls
When a Blackmagic RAW or ARRI clip is selected, extra cards appear with the decode and look controls for that camera. Camera / Sidecar Look (Blackmagic) and Native Parity (ARRI) use the camera maker's own look. Scene Linear ACES 2065-1 (Blackmagic) and Scene Linear / ACES (ARRI) are for higher-fidelity EXR-style workflows. Details are in Camera RAW: Blackmagic RAW and ARRI.
Run a short test export using two codecs to compare quality and size before committing to a long render.