Error Code:
TimedText-UndefinedTickRate (The tick rate is undefined)
Error Message:
The tick rate is not defined and is required for the conversion of 1142270000t. Please add a tick rate (ex: ttp:tickRate) to the source asset.
Definition:
The source asset contains one or more timecodes expressed in tick format (the "t" suffix, for example 1142270000t), but no ttp:tickRate attribute is defined anywhere in the file.
Solution:
Add a ttp:tickRate attribute to the source asset reflecting the rate the tick-based timecodes were actually authored against, then redeliver.