In the professional broadcast and digital cinema industries, SxS (pronounced "S-by-S") is a high-performance flash memory card standard. Co-developed by Sony and SanDisk, the platform complies with the Personal Computer Memory Card International Association (PCMCIA) ExpressCard standard. It serves as the primary recording medium for high-end digital cinematography. Core Technology & Read/Write Speeds SxS architecture utilizes a PCI Express (PCIe) bus interface natively integrated into the card. This eliminates interface bottlenecks common to consumer-grade media options like standard SD cards. SxS PRO X : The latest generational evolution supports real-world data transfer speeds up to 1250 MB/s (10 Gbps) via a PCIe 3.0 interface. SxS PRO+ : Engineered specifically for sustained 4K video ingestion , it guarantees a minimum recording speed of 1.3 Gbps . SxS-1 : A cost-efficient variant utilizing multi-level cell (MLC) flash memory, balancing high speed with strict budget constraints. The EB Streaming Protocol Sony integrates proprietary EB Streaming technology (Expert Broadcast Streaming) into modern SxS media. This protocol facilitates constant, bidirectional data communication between the memory card and the host camera's image processor. Sony SxS cards (English)
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Everything You Need to Know About SXS (Side‑by‑Side) Video An in‑depth guide for creators, editors, and viewers who want to work with side‑by‑side 3D video.
1. What Is “SXS” Video? SXS stands for Side‑by‑Side . In a side‑by‑side video, the left‑eye and right‑eye images for a stereoscopic 3D experience are placed next to each other in a single frame: | Left‑eye view | Right‑eye view | |---------------|----------------| The two images share the same resolution, aspect‑ratio, and frame‑rate, but each occupies half the horizontal width of the final picture. When displayed on a 3D‑capable screen (TV, monitor, headset, or projector) the device splits the frame, sends each half to the appropriate eye, and the brain fuses them into a perception of depth. There are two common variants: | Variant | Description | Typical Use | |---------|-------------|-------------| | SBS (Side‑by‑Side) Full‑Width | Two full‑resolution images placed side‑by‑side, each halved horizontally (e.g., 3840×1080 → 1920×1080 per eye). | Consumer 3D TVs, gaming consoles, YouTube 3D uploads. | | SBS (Half‑Width) / “Top‑Bottom” (optional) | Each eye image is compressed both horizontally and vertically (quarter‑resolution) and placed side‑by‑side. | Mobile VR (Google Cardboard, low‑bandwidth streaming). | The most common term you’ll see on video‑hosting sites, hardware manuals, and editing software is simply SBS or Side‑by‑Side ; “SXS” is just a shorthand used by some communities. sxs video
2. Why Use Side‑by‑Side Video? | Pros | Cons | |----------|----------| | Compatibility – Almost every 3D‑capable player (VLC, PowerDVD, YouTube, Oculus) understands SBS. | Resolution loss – Each eye receives only half the horizontal pixels, so perceived sharpness drops. | | Simple pipeline – No need for special metadata; the format is just a regular video file. | Aspect‑ratio quirks – Some devices require you to specify the “SBS” flag or use a specific container. | | Easy to create – Many cameras, smartphones, and rigs output directly in SBS. | **Not suitable for high‑end 4K/8K 3D where full‑resolution per eye is required. | | Streaming‑friendly – Works over standard video codecs (H.264, H.265, VP9, AV1). | Viewer comfort – Poor scaling or mismatched eye images can cause eye strain. |
3. Common Sources & Capture Set‑ups | Device | How It Generates SXS | Notes | |--------|----------------------|-------| | Stereoscopic 3D cameras (e.g., Z CAM K1 Pro, Insta360 Pro 2) | Built‑in SBS output (full‑width). | Usually configurable via firmware. | | Dual‑camera rigs (two DSLR or mirrorless cameras on a bar) | Post‑capture stitching (merge two video files side‑by‑side). | Requires precise inter‑axial distance and sync. | | Smartphones with “3D mode” (e.g., LG G5, some Huawei models) | Native SBS recording app. | Often limited to 1080p@30 fps. | | Game consoles & PC games (PlayStation, Xbox, SteamVR) | Render two viewports and combine in real‑time. | Typically uses the GPU’s “Stereo‑Render‑Target”. | | VR head‑mounted displays (HMDs) | Export “monoscopic” view, then convert to SBS for sharing. | Useful for walkthrough videos. |
4. How to Create SXS Video (Step‑by‑Step) 4.1 Using a Dual‑Camera Rig In the professional broadcast and digital cinema industries,
Synchronize the cameras – Use a hardware trigger or a time‑code generator to ensure frame‑accurate capture. Set identical settings – Resolution, frame‑rate, white‑balance, ISO, focus, and picture profile must match. Mount the cameras – Choose an inter‑axial distance (usually 6–7 cm for human‑scale scenes). Capture footage – Record in the highest possible resolution (e.g., 4K). Import both streams into a NLE (non‑linear editor) such as DaVinci Resolve , Adobe Premiere Pro , or Final Cut Pro . Create a side‑by‑side sequence :
Add the left‑eye clip to Video Track 1 . Add the right‑eye clip to Video Track 2 . Resize each clip to 50 % width (or set the project resolution to half‑width and place the clips side‑by‑side). Align them horizontally (left clip at X = 0, right clip at X = half‑width).
Export using a codec that supports the target resolution (e.g., H.264 1920×1080 for 1080p per eye). Tag the file (metadata or filename) with “_SBS” or “_sidebyside” for easy identification. SxS PRO+ : Engineered specifically for sustained 4K
4.2 Converting a Regular 3D Video to SBS If you have two separate eye files (e.g., left.mp4 and right.mp4 ), you can use FFmpeg : ffmpeg -i left.mp4 -i right.mp4 \ -filter_complex "[0:v]scale=iw/2:ih[left];[1:v]scale=iw/2:ih[right];[left][right]hstack=inputs=2[out]" \ -map "[out]" -c:v libx264 -crf 18 -preset slow output_sbs.mp4
Explanation: