Space Required for Multi-Angle Video

[ullanta]

(Sorry; thought I'd repost here in hope of response)

Well, I've been going under the assumption that storage requirements for a multi-angle video track are something like:

size of video angle 1 + size of video angle 2 + size of audio 1 + size of audio 2

(for 2 video angles and 2 audio tracks).

However, when multiplexing, the result is coming out more like:

(size of video angle 1 + audio 1 + audio 2) + (size of video angle 2 + audio 1 + audio 2)

that is, the audio information is duplicated for each video angle.

Looking around, I don't see any clear indication of which should be the case. Nothing I've found clearly discusses space requirements of multi-angle tracks - only bitrate issues; though some say that 2 angles will "double the amount of required space" - but usually in a context where it's not clear if they mean video-only space or total track space.

Does anyone know definitively if audio data should indeed be duplicated for each angle in a track? Both possibilities seem reasonable, but I was really hoping for the first, to save space...

 

[ullanta]

If anyone cares, the long answer is here:

http://www.uemedia.net/CPC/2-pop/ub...ords=multi-angle&topic=&Search=true#Post86914

In short: there are two methods of switching angles - seamless and "non-seamless". Seamless gives smoother but delayed switches, non-seamless gives faster but uglier switches. For various technical reasons, seamless switching indeed duplicates all the track data, not just the video data. DVDSP uses seamless switching.

So, it's not a way to save space!