The Two Types of Render: Preview and High-Quality
Jaunt Cloud Services currently generates two types of renders: Preview renders and High-Quality (HQ) renders.
The Preview render is intended to be used for 'selects' (a.k.a., 'rushes') and to serve as an editorial proxy for rough cuts. The Preview render uses simplified stitching to quickly deliver a version that the creative team can use to determine which takes and time sections should be used for the final edit. This is not the final quality render, but merely a working proxy. As such:
- the resolution is smaller - 2304x2304 for stereoscopic, 2304x1152 for monoscopic
- the encoding is lighter - light bit-rate MP4 video
- the stitching uses simple algorithm - faster delivery for rushes
The High-Quality render is intended for final conform of the edit or post-production work. The HQ render uses Jaunt's advanced algorithm to provide a premiere, immersive, stitched panoramic video. This render is computationally expensive and is distributed across the Jaunt Cloud for faster rendering. This render is delivered in two codecs, both of which are meant to deliver a visual high-quality and high bit-rate; one set of videos is ProRes 422 Standard Quality in a Quicktime codec and the other is H.264 in an MP4 container. The MP4 renders are intended for users with smaller bandwidth, thus needing a smaller file download size, while still preserving quality. For both choices:
- the resolution is larger - From 3840x3840 to 8192x8192 for stereoscopic, 3840x1920 to 8192x4096 for monoscopic
- the encoding is heavier - high bit-rate to ensure preservation of visual quality
- the stitching uses advanced algorithm - quality delivery for post-production and mastering
Why 3840 instead of 4096? (Or, UHD vs DCI 4K):
Use of the term "4K" often leads to confusion, when one person may be intending '3840' while the other is thinking '4096'. This section is intended to clarify this confusion, and explain what you can expect from Jaunt.
Once television went digital, early standards were set for various resolutions. Eventually, High Definition (HD) resolution was set to be 1920x1080. Now that "4K" is a more common standard for video, people hear the term 'Ultra HD' (UHD). UHD has a resolution of 3840x2160. More recently, the Digital Cinema Initiatives (DCI) has introduced "4K" as 4096x2160. Note that both of these have the same height (2160), but the aspect ratios are very different due to the width difference (16:9 for UHD, 256:135 for DCI).
To be more in line with 16:9 encoding and decoding processes (which is very common on viewing devices), Jaunt has chosen to standardize 4K renders as 3840 pixels wide. Additional render widths are available as shown above.