Offline Two-pass mode - Offline Two-pass mode - 2026.1 English - PG252

In two-pass mode the clip is encoded in two separate runs over the entire sequence:

First pass (TwoPass = 1)

The whole sequence is analyzed and the statistics are written to the file named by TwoPassFile. Setting SCDFirstPass = ENABLE speeds up this pass by performing only scene change detection.

Second pass (TwoPass = 2)

The encoder reads the statistics from TwoPassFile and produces the final stream, using knowledge of the full sequence for better global bitrate allocation.

Because the second pass needs the complete first-pass statistics before it can start, this mode is offline (non real-time) and operates at the sequence level.