Teletext subtitles are encoded directly into a specific line or lines into the VBI of the video. Encoding Teletext can be achieved by first using the Teletext option at the Target Type checkbox. After that several additional options will be displayed concerning both Teletext data transmission and text's presentation on the viewer's screen as follows:
Teletext Page Number |
Enables you select the page number the subtitles will be inserted into, page number must be selected between 100 and 899. |
VBI Lines |
Enables to select the particular line or lines of the Vertical Blanking Interval (VBI) where the Teletext data will be inserted into. |
OP42 Compatible |
Generates Teletext data packets compliant with the OP42 practice. |
Same data on all lines |
The Teletext data will be transmitted on both specified VBI lines if two or more line numbers have been specified earlier. It is intended to secure the eventual data loss during transmission of the video. |
Continuous time filling packets |
Sometimes it may be required for a Teletext data to be inserted with each data package submitted for transmission. Selecting this option could be useful in this case because the EZTitles Plug-in will insert a time filling packet. Note: When using multiple Plug-ins every filter except the first should have this options turned off. For usage of multiple Plug-in presets please refer to the following topic |
Double transmit captions |
By activating this option the Teletext subtitles will be transmitted twice in consecutive order to ensure there is no data loss during the transmission. |
Level |
Specify the Teletext level for the subtitles. Teletext level 1.5 provides extended support for special characters. |
Language Code |
3 letters language code specified by the ISO 639-2 standard. |
PID |
Enables you to specify the ID of the Teletext stream. |
Erase incoming teletext data |
All Teletext data already present in the video will be erased by activating this option. If Teletext data is present but the option is switched off the filter will insert subtitles only if there is enough space in the selected VBI lines. Note: When using multiple Plug-ins every filter except the first should have this options turned off. For usage of multiple Plug-in presets please refer to the following topic |
Langauge |
There are different code tables used to display and transmit text in different language. The exact language of the Teletext subtitles have to be specified or otherwise some symbols may not be properly displayed on the viewer's screen. |
Force double height |
Makes all the text in the file to be displayed in twice its height. |
Force Text Color |
Overrides text's color with the one selected from the color palette on the right. The colors which can be used in Teletext subtitles are limited by the Teletext specifications. |
Alignment |
Overrides the text alignment specified in the original subtitle file. Select No change to keep the original position as set in the subtitles file. |
Initial Page (page 100)
Often it is required to include an initial page or page 100 which usually contains some general information about the available Teletext data. It may contain information about the programme, broadcaster, which are the Teletext pages containing subtitles, etc.
You can enter such content in the respective text field but please bare in mind there are restrictions. The text can be inserted at maximum of 23 text lines and there must not be more than 40 characters on each text line.
Different subtitle versions and languages
The EZTitles Plug-in can easily fulfill the requirement to add subtitles in more languages as Teletext by inserting new instance of the filter for each of the required languages. version and select the required attributes (Remember not to check Erase incoming teletext data on any filter after the first). You can share the same VBI lines.
Please note that if the filters share the same VBI lines the initial page (page 100) must be selected in the last filter.
Note: Remember that the Erase incoming teletext data option must be switch off for each instance except the first one or otherwise the teletext data will not be encoded at all.
Also if the different filter instances use the same VBI lines then the initial page must be defined for the last filter only.