Hi,
Could we have support for frame sequential 3D movies? Currently skybox only support side-by-side and top-bottom 3D videos. The advantages are : it's supported by x264, it saves 30-40% file size with similar quality compared to SBS and TB as it uses L-R image similarity, and it should be straightforward to implement, as skybox already decode the frames properly, they just need to be displayed on each eye instead of alternating them temporally.
Verbose explanation:
Currently, the only supported 3D formats are side-by-side and top-bottom. These formats waste quite a lot of space since the encoding doesn't use at all the similarity between L and R images.
There is the MVC format, native from Bluray, which has been requested, which stores the full L stream, and uses the similarity between L and R for storing a much smaller R stream (typically 1/3 the size of L). It's very good as non MVC aware properly play the L mono stream, but very few encoders support it (neither x264, x265 or nvenc, AFAIK only professional Bluray authoring tools) so besides 25-50GB direct bluray ripping it's almost impossible to create them.
x264/x265 does support "frame sequential" encoding, with alternate L and R frames. It's about as efficient as MVC. The only drawback I can see compared to MVC, is that unaware players (such as skybox) show alternating frames sequentially.
Cheers!
