Autopano Video Patch Archives

Main changes

This is the final version of the new Autopano Video engine v2. It is by far the most advanced video stitching engine we've built, with a lot of new and unique features.

Director's cut mode

When creating 360 video, one of the big challenges after that, is to be able to produce a standard video out of the 360 video, by selecting projections, crop zones, orientation, etc. This means framing the view and allowing creativity after stitching.

The director's cut is all about that. It allows you to define a rendering camera, with projections and orientation that can change over time. The video generated in this mode can have the aspect ratio of your choice and is dedicated to be shared as a standard video (no 360 video viewer needed). All the Autopano output projections (Planar, Little planet, Fisheye...) are available and can be smoothly interpolated from one to another. At any time, you can switch the video editing mode between standard full sphere output and director's cut video output.

The new timeline tab "Authoring" gives access to two new tracks, defining the director's cut rendering camera over the time:

• Orientation: orientation of the rendering camera.
• Projection: projection of the rendering camera.

Improved stitching / horizon track / RMS curve

The "Camera" track of the previous Autopano Video version has been split into two separate tracks: "Horizon" and "Stitch". These new tracks allow you to compute new stitches without losing all the work you did to keep a straight horizon over the time. This improves the production workflow.

When we did that split, an idea came to us. How cool would it be to be able to visually see the stitching quality. That could be a good solution to understand what is happening along a video. This is the RMS error curve, which is the equivalent of the RMS value when stitching a still panorama but along the video. This is displayed over the stitching track in a curve function, the lower, the better. High peak means, high RMS, so big parallax and bad stitch.

Due to inevitable parallax in every 360° video capturing system, getting a perfect render requires the stitching to be adjusted to the scene over the time. This new curve is a very useful tool to detect problematic moments and fix them. After a first computation, that can be long, the RMS curve can be updated almost instantly even if you calculate a new stitch locally.

Range stitching on a selection

Getting a good stitch template can be a complicated problem. There are 2 cases that were complicated to manage:

• Not enough details at any moment: Typically in an underwater video, you cannot find a single moment in the whole video where all input videos have enough good content that allows you to get a stitch. It is only at some different moments, that some pairs of cameras have relevant links. Over the full video or a large range of time, globally, all the data needed to get a stitch is there, but not at a single moment in time.
• Optimal stitch for a given content: If your camera is stationary or if the content relative to the camera is globally the same, it should be possible to get an optimal stitch for that range of time.

To be able to manage the two problems, we introduced range stitching in Autopano Video 2.0. The stitching on a selection allows to stitch on a sequence of the video, using automatically the best instants for each video pair. This function gives very good results in every situations and is also advised for stitching easy cases.
It is interesting to look at this feature while analysing the RMS curve. Using range stitching, it will show a lower RMS over the selected range, whereas current time stitching gets the best just for that frame.

New Mask timeline track

One of the big projects of 360° video is managing parallax. Both tools, RMS curve and range stitching, are really good for getting a better local stitch, but sometimes, it is not enough. To overcome this problem, Autopano Video 2 introduces a Masking timeline to select what is displayed from which camera at which time.

It contains states like other timelines. The Mask track allows to benefit from all the power of the Autopano Masking tool to make some fixes on video boundaries over the time.

Stereoscopic stitching (AVP only)

Autopano Video Pro is now able to handle stereoscopic videos in a very friendly way thanks to a new interface, allowing you to assign each source video to an output eye. This new interface allows you to work with a rig in which a same camera is used for both left and right, rendering without the need of creating manual Masks.

For more information, see the documentation page: Stereoscopic stitching in Autopano Video 2

Camera presets introduction

The camera presets let you configure the stitching optimizer with advanced options. The presets let you define the lens type (fisheye or standard), initial focal and distorsion values, enable or disable their estimation, and choose their scopes.

The full documentation about this feature will be here (Warning: Work in progress): Stitching and presets

In practice, what does it allow?

• Accurate lens calibration
  If you use back to back configurations, like 2 Kodak SP360 for example, the overlapping zone is not enough to be able to calculate the lens distortion. You will need to create a first panorama while rotating the lens, so you can calculate the lens distortions.
  Once you have some accurate distortion, through the presets, you can inject them in the stitching process. The presets is exactly about that, use for example, calculated k1,k2,k3, while optimizing focal and sensor/lens offsets.
  The way we integrated presets allows users to create their own presets super easily for their cameras, for example, if you modify gopros to get 185° lenses, this system will work perfectly.
• Improvements
  This new system doesn't really reduce the RMS value, you should notice that, but as the lens distortion are really accurate, the visual experience that you have through HMD is really improved. You don't have any more visual bumps like if you were looking at a mirror ball.
• Current presets
  There are already some presets shipped inside the software. You can add you own by just creating a XML.
  • GoPro: Generic GoPro preset that already stores lens distortions. The distortion will still be optimized. This mode is a really generic mode.
  • QBic: Generic QBic mode, but it doesn't contain any precalculated distortion yet. It may be improved in the future.
  • Kodak SP360: For back to back set-up with 2 Kodak cameras. The distortion are forced as they have been calculated before. A good example of calibration and reusing the calibration is available here: How to stitch back to back rigs
  • Generic mixed lenses: To be used with heterogeneous rigs that have different fisheye models in the same rigs.

A lot of nice and sexy miscellaneous improvements

We addressed a lot of the requests of our users in several areas. Let me highlight some of them:

• Improved audio synchronization: Our audio synchronization algorithm has been greatly improved thanks to the use of state of the art techniques and should no longer fail if enough sound is captured in source videos.
• Local motion estimation: In Autopano Video 2, you will no longer have to compute the motion over the full project before you can start editing. It can now be estimated and updated only on a chosen part of the video.
• Autopano Giga new color correction engine: Autopano Video 2 benefits from the new color correction engine of Autopano 4. It is just amazing, see the following video See the video
• Grid over preview: a grid can be displayed over the preview to help detect horizon drift.
• Preview resolution: the preview resolution can be changed at any time.
• VLC source players: the source videos players are now based on the VLC library which means that more input formats will be supported.
• Timeline editing in key frames mode: a new editing mode accessible from the settings configuration interface allows you to switch timeline editing to a more key-frames-based mode. In this mode, every pano edit automatically inserts a new state.
• Track collapse: unused timeline tracks can be collapsed to save space in your edition workspace.
• Speed up: The exchange file used between AVP and APG were tiff before. We switched to jpeg and it makes the edit button much faster.
• Introduction wizard: The first time you use AVP, you will see a quick introduction wizard guiding you through the first steps in video stitching. That's really handy for beginners.
• Manual synchronisation range: We allow you to use negative shift in the tools, so that the synchronization in manual mode is easier.

4K / High DPI / Retina display support

We've always cared about the visual comfort when using our software, and the experience should be enjoyable during use. But with the latest computers / laptops, everything is quickly evolving to use high resolutions on screen and high DPI. Our software should adapt to that evolution.

Having an interface that adapts itself to high DPI / Retina display depends on the way the software is built. We use Qt for almost all our software. Qt should then be providing us with the solution for High DPI / Retina Display. It happens that Qt has provided this only really recently, with Qt 5.4. Our software relied on Qt 4.8 ( quite old ). It wasn't possible to make the switch before, as it does impact a lot of the codebase. We could only plan the switchover for a major update, as it also impacted the minimal OS configuration needed for the software. The result is that we now have a better interface, with Retina icons / high DPI screen support even for 4K screens. The switch also accelerates every part of the software related to displaying something on the screen. With this upgrade of Qt, we are also ready for Windows 10 and Mac Yosemite.

• Google spherical metadata support
  Google has released a specification about spherical metadata here: https://github.com/google/spatial-media. We added direct support of this metadata to our software. That means that generated video out of Autopano Video will now be compatible with the upcoming 360° video support on YouTube. To support this specification, we need your operating system to have Python 2.7 installed. On MacOS, it is installed by default. On Windows, please install Python and put it to the path so we can use Python to write this specification in the output video.
• VLC 2.2 final integration
  Luckily for us, VLC released one week ago a final version LibVLC 2.2. It has been integrated into our software and allows to be more stable in several cases. One nice side effect of this new VLC is that a better Linux version of Autopano Video has been made possible. We officially don't support the Linux version, but we'll make it accessible to users whising to try it at their own risks.
• Qt and compilers updates
  To be really up to date in the development tools, we used here the latest version of both Qt and Intel compilers. You should notice a small improvement in terms of performance.

Fixes since 2.0.0 RC 1

- 0004442: [UI behavior] Qt translation
- 0004567: [Main view] Fisheye images badly cropped when the circle is decentered

Fixes since 1.7.1

Use 360° Images & Videos for:

Advertising

Spice up your campaign.

Editorial

Turn readers into engaged viewers.

Virtual Reality

Perfect for game skyboxes, education, travel experiences and more.

Web & Mobile

It's easy to drop cross-platform panoramas into mobile and web apps.

...and more

Anything digital and print campaigns.

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