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ISMV lacks any sort of edit list support, as well as tfxd is effectively the PTS of the fragment for most intents and purposes. Thus, if b-frames are requested without negative CTS offsets you end up with N frames' worth of delay (tfxd PTS plus the CTS offset of the first sample). Negative CTS offsets enable the first sample to have CTS=DTS, and thus a/v desync due to b-frame reorder delay is avoided.