Originally posted by: DanielB
Using two angles does not mean using half the bitrate. It's a little un-intuitive, but multi-angle bitrates work like this: If you're using two angles, the MAXIMUM bitrate for EACH angle of video plus all audio plus all subpictures must not exceed 8.0 Mbps. Figure on subtracting about another 1.2 Mbps for each additional angle. So for a two-angle encode, you can still have a high maximum bitrate.
references? evidence? Google is your friend, Daniel-san:
Howdy Trai - "Mr. DVD"
I was incorrect in the following statement:
> Check out the tutorial in DVDSP. They use 3 angles each at 6.4 Mbps. That
> would put the total data rate at 19.2 Mbps + the audio data rate. No
> problems.
19.2 Mbps is NOT the actual bitrate being delivered per second, because the
the other video streams/angles cannot be added to the total data rate per
second as they aren't "playing". But rather, being skipped over as you
stated. Sorry to mislead anyone. It is a fine distinction but an important
one.
However, there is a small correction to your post as well :-)
The maximum bitrate for multi-angle video streams per the specification is 8
Mbps not 7.
I was only suggesting 7 because it is never a good idea to push the bitrate
limits to their specification max.
The maximum sustainable total bitrate for a combined video stream (single),
audio and subtitles is 9.8 Mbps. Some players may support a burst rate that
is slightly higher 10.08 Mbps, but I wouldn't recommend pushing that.
If you never knew the reason for the 9.8 Mbps limit:
1x DVD drives sustains 11.08 Mbps. 1 Mbps is taken up by navigation overhead
leaving 10.08. The DVD-Video peak data rate was/is constrained to 9.8 Mbps
to support buffering for seamless branching which has nothing to do with
multi-angle video FYI.
Happy New Year Gang!
-pete -- Courtsey of Apple's DVD List Archive.
I believe multi-angle is based upon interleaving the angles together, which is why there can sometimes be a pause before your player changes angles as it clears it's buffer as it were. Seamless branching is more complicated as it involves encoding and multiplexing the files in such a way that they 'ease in and out of each other' for want of a better term.
As it appears the seamless branching guide deals with pre-prepared streams, perhaps Dr Gonzo could help out with his copy of TFDVDEdit?
DVD-BOY