outputTimestampMode
The output timestamp mode for the origin endpoint's segments. This setting is only configurable on channels with OutputLockingMode set to NON_EPOCH_LOCKED. This value is immutable after endpoint creation. If you don't specify a value, the default is PASSTHROUGH.
The allowed values are:
PASSTHROUGH- Output PTS (Presentation Timestamp) values pass through unchanged from the input.REBASED_TO_CHANNEL_START- Output PTS is rebased relative to the channel start time.