Fig. 5.4e – Integration of primary and secondary streams with video gaps and PiP metadata event
Picture in Picture (PiP) settings, Meta Data files and Meta Data events
In the PIP area there are several options that allow you to position and adjust the size of the secondary stream or PIP picture in picture box that will appear over the primary video stream. These options are, PIP horizontal position, PIP vertical position PIP scale, Luma key, and Luma key upper limit.
Of these options, Luma Key and Luma Key upper limit values can only be set on the entire stream, on the level of PC, or VPC as per the Blu-ray specification. Positional and Scaling values can be set as needed. The brown shield icon on the subplayitem indicates the scaling factor. Please note that the entire PIP must fall within the dimension of the primary video. It is against the specification and playback issues may occur if the PIP content is moved partially or wholly off the primary video screen.
You also have the option of attaching a text-based metadata file as well as adding metadata events points (available from the object explorer) directly onto the timeline that will allow for time code based PIP repositioning.
Select the secondary video stream in the Project Bin to access the properties shown in Fig. 5.4e. In this case the settings will affect all subplayitems within the secondary stream.
Fig. 5.4e – PIP properties settings w/o Meta Data Source file
Luma Key is defined as a luminance value between 0 and 255, inclusive. When the Luma Key flag is set to True, this value defines the upper limit threshold of the luminance where part of the secondary video will be fully transparent. It can be utilized to erase a solid dark background, or to make the video completely transparent. For example: if a person is speaking in front of a black background, then setting the Luma Key Upper Limit to a low number, such as 10, will most likely cause the black background to disappear, and making the subject appears as if the person is part of the video. Similarly, a pure black video having extremely low luminance can be used to fill the gaps of secondary video, and after setting Luma Key to a low value, all the black gaps will completely disappear from the viewing screen.
Luma Key is static to the entire stream, and cannot be changed in the middle of the stream, as compared to the PIP Scale.
PIP Position, Scale