On 2015-11-03 12:57, Christian Ebert wrote: > * James Darnley on Tuesday, November 03, 2015 at 01:29:43 +0100 >> libx264 definitely supports changing resolution between first and later >> passes. > > Also when then second pass involves a change in profile and/or > level, meaning change of frame types? > >> It also determines frame types in the first pass. > > So, only when the same profile and level and frame related > settings are the same, I assume.
If you change settings so that the stats file and the current settings cannot be resolved then I would hope that there is an error rather than continuing to do some unknown thing. Last I remember is that the second pass doesn't run frame type decision at all. E.g. I would hope that using a stats file which has B-frames and asking for main profile would result in an error. (Why you would ask for main profile these days is beyond me.) > otoh without slow-firstpass for instance the reduction to ref=1 > might affect already frame types? It been a long time since I looked into all this but I recall that few options make a difference to frame types. They are decided in the lookahead. I don't think that reference frames were one of the settings that affects it.
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