The subtitles tab contains settings related to subtitles in your content, as shown in Figure 6.11, “Subtitle settings tab”.
DCP-o-matic can either:
.srt), SubStation Alpha (
.ssa) or DCP XML files. You may find the great free program Subtitle Edit useful for creating such files.
Embedded subtitles are usually represented using a set of bitmaps, especially on files that have come from DVD or BluRay. Such subtitles can (currently) only be ‘burnt’ into the DCP (that is, they are included in the image and not overlaid by the projector).
With SubRip, SubStation Alpha or DCP subtitles you have the choice to either burn-in or include the subtitles as separate subtitle ‘asset’ within your DCP (in which case the projector overlays them onto the image on playback). The difference between burn-in and overlay is illustrated by Figure 6.12, “Burnt-in subtitles” and Figure 6.13, “Separate subtitles”.
The advantage of separate subtitles is that the same video content can be used for DCPs in many different languages. This means that only a small text file needs to be changed for each target language, rather than a large video file. It also means that the time-consuming video encoding need only be done once for the project rather than once for every language.
Select the Use Subtitles check-box to enable the subtitles in the selected content.
Select the Burn subtitles into image check-box to burn these subtitles into the image; if this is not ticked the subtitles will be included separately in the DCP to be rendered by the projector. This check-box will always be ticked if you are using embedded ‘image’ subtitles.
The X Offset and Y Offset controls move the subtitles around within the image. The offsets are expressed as a percentage of the video frame size; 100% X offset is the entire width of the frame, and 100% Y offset is the entire height. Hence, to move the subtitles down by half the frame height you would use a Y offset of 50%.
The X Scale and Y Scale controls scale the subtitles. Scale values of 1 make the subtitles the same size (relative to the size of the image) as they are on the original. Values lower than 1 make them smaller, and values higher make them larger. You can stretch the subtitles in either direction by specifying different values for X and Y scale. Subtitles from DVD and Blu Ray sources are frequently larger (relative to the video frame) than those typically used for DCP, so it is often useful to scale such subtitles down using these controls.
The Line spacing control adjusts the line spacing of the subtitles. This only works for non-embedded (text) subtitles.
The Stream control changes the subtitle stream that is used when the content has more than one.
If you are using non-embedded (text) subtitles you can see the subtitle text and timings by clicking the View... button, or specify the fonts that should be used by clicking Fonts....
With any subtitles you can click Appearance... to change how the subtitles look.