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Blu-ray Disc Demystified
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Table 611 Recommended Data Rate Limitations for Camera Angles
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Number of Camera Angles Maximum Data Rate (TS_Recording_Rate)
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The term, seamless multistory, refers to a video presentation that allows different paths through the disc content, hence allowing for multiple story lines It is realized by jumping from place to place on the disc without any break or pause in the video (see Figure 611) This feature may be used for providing a viewer with alternate endings, or a director s cut, or similar applications Figure 611 Seamless Playback Example
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From a conceptual point of view, the way seamless multistory is implemented in Blu-ray is rather straightforward Different playlists define the multiple stories and the necessary video pieces are tied together for the desired presentation Although two pieces of video that are to be connected seamlessly do not have to be contiguous on the disc, the jump distance between them is restricted This means that any two video pieces that will be connected seamlessly should be very close together on the disc, so that the pickup head of the drive can jump to the next position without causing any breaks or pauses of the video The higher the data rate of the program stream, the smaller the jump distance needs to be, because the pickup head has to start reading data sooner to avoid running out of data in the buffer
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Blu-ray supports showing a secondary video image called, picture in picture (PIP) This requires a second video decoder in the player and adds some complexity to the disc While the initial Blu-ray players (Profile 10) did not have to support picture in picture as a mandatory feature (which allowed for faster market introduction of players without the added complexity of a secondary video decoder), all current players that are compliant with either Profile 11 or Profile 2, must support PIP as a mandatory feature
Blu-ray Disc Demystified
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There are some restrictions on the resolutions, frame rates, and combinations of codecs for PIP streams (Tables 612 and 613) The content author can also determine the position of the picture in picture window and the position can change during playback In order to do this, each picture in picture stream has positioning and scaling metadata associated with the secondary video file For in-mux synchronous PIP streams, this metadata cannot be changed on-the-fly and it has to be established during the multiplexing stage Table 612 Allowed Combinations of Primary and Secondary Video Codecs
Primary Video MPEG-2 Secondary Video MPEG-4 AVC SMPTE VC-1
MPEG-2 MPEG-4 AVC SMPTE VC-1
Allowed Prohibited Prohibited
Allowed Allowed Prohibited
Allowed Prohibited Allowed
Table 613 Allowed Combinations of Primary and Secondary Video Formats
Primary Video Resolution Frame Rate Secondary Video Resolution Frame Rate
1920 1080 or 1440 1080
2997i
1920 1080a 1440 1080 720 480 1920 1080a 1440 1080 720 480 1920 1080a 1440 1080 720 480 1920 1080a 1440 1080 720 480 1280 720 720 480 1280 720 720 480 1280 720 720 480 1280 720 720 480 720 480 720 576
2997i
2997i
23976p
23976p
1280 720
5994p 50p 23976p 24p
5994p 2997p 50p 25p 23976p 24p 2997i 25i
720 480 720 576
2997i 25i
aSupport of 1920 x 1080 resolution for secondary video streams is optional for players
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Blu-ray Disc Demystified
Application Details
There are three kinds of picture in picture scenarios possible in-mux synchronous PIP, out-of-mux synchronous PIP, and out-of-mux asynchronous PIP The in-mux synchronous PIP is typically used for director s commentary or similar applications Both video streams are multiplexed together into a single transport stream and play from the disc Using this scenario, the primary and secondary videos are locked to the same time clock when presented on the screen The two out-of-mux PIP options do not require the secondary video to be multiplexed together with the primary video And, in these scenarios, the secondary video does not have to live on the same disc The PIP stream could be made available as a download to a BDLive (Profile 2) player A typical scenario would require the player to use a network connection to download the PIP stream to the local storage in the player Once the download is completed, an application on the disc would recognize the stream and use the Virtual File System (VFS) to bind the new stream into the disc so it becomes available for the viewer (more information on VFS is presented later in this chapter) The fact that the stream is not on the disc will be transparent to the viewer With the out-of-mux synchronous approach, the application is identical to the in-mux scenario where the context of the secondary video is tied to the context of the primary video Hence, they both have to be tied to the same clock However, the out-of-mux scenario allows a commentary to be made available after the disc has been finished For instance, with release windows for home entertainment getting shorter all the time, it may not be possible to record a director s commentary in time for the production of the disc By relying on the out-of-mux option, this commentary can be produced after the disc shipped and then made available through a network download by the player (given that this option is authored into the initial disc) In the out-of-mux asynchronous case, the out-of-mux PIP stream is not tied to the primary video Instead, user interaction can determine when the PIP stream is played Imagine a question and answer component on a disc: during playback of the feature, the viewer has the option to ask various questions to the creators of the movie The answers will be displayed as a PIP commentary stream Since it is up to the viewer when a question is asked, the PIP stream cannot be synchronized to the primary video With the asynchronous PIP, such an application scenario is possible However, as in the out-of-mux synchronous case, the data cannot be played off the disc Instead, it must be stored in the local storage area of the player
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