Support for Temporal Interlaced Stereo3D (Frame-sequential) Format

[mikekoetter]

I was wondering if UltraGrid currently supports—or if there has been any consideration for supporting—Temporal Interlaced Stereo3D streams, where the Left and Right eye views alternate temporally at double the target framerate (i.e., frame-sequential 3D).

This format seems to be represented in libav as AV_STEREO3D_FRAMESEQUENCE under the AVStereo3DType enum:

Views are alternated temporally.

 frame0   frame1   frame2   ...
LLLLLLLL RRRRRRRR LLLLLLLL
LLLLLLLL RRRRRRRR LLLLLLLL
LLLLLLLL RRRRRRRR LLLLLLLL
...      ...      ...

This format is becoming increasingly relevant, especially with the emergence of newer Stereo3D displays that rely on frame-sequential input. Having support for capturing dual-link stereo sources and encoding/decoding to this format would be incredibly useful for certain workflows.

Would love to hear your thoughts!

[txtpauld]

I second this as this is coming up more and more as the number of ways that 3D is transmitted is growing. One facility may rely on dual stream 3D to their projector and then want to stream to another facility that wants to show it on a direct view surface that requires the signal be time-sequential interleaved 3D.