Error Code:

TimedText-TTMLUnresolvedPixelPositioning

Error Message:

Missing tts:extend Warning

Example: The 'tts:extent' attribute for element 'region' on line 11 uses pixel positioning, but there is no extent on the tt element. Positioning will be ignored.

Definition:

When pixel positioning is used, tts:extent must be defined in root container in order for positional data to apply and define the meaning of a pixel. The positional information will be ignored.

Solution:

Do not use pixel values to define regions or font sizes. Only use percentage values.

Use tts:textAlign and tts:displayAlign for positioning along with static values for tts:extent and tts:origin.
tts:fontSize shall be defined as 100%.

For more information, please refer to the Timed Text General Style Guide.

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