Build the per-mode driver.
EXR mode flips the session's isEXRSequenceRecording flag in finalize via onFinalized so the driver doesn't need to know about that field.
isEXRSequenceRecording
onFinalized
Build the per-mode driver.
EXR mode flips the session's
isEXRSequenceRecordingflag in finalize viaonFinalizedso the driver doesn't need to know about that field.