On a very long video (4hrs), when doing a 2-pass encoding, I get x264 [error]: 2nd pass has more frames than 1st pass (275054)0.039 [511:125] x264 [error]: continuing anyway, at constant QP=25 x264 [error]: 2nd pass has more frames than 1st pass (275054)0.039 [511:125] x264 [error]: continuing anyway, at constant QP=25 x264 [error]: 2nd pass has more frames than 1st pass (275054)0.039 [511:125] x264 [error]: continuing anyway, at constant QP=25 Pos:11470.5s 343775f (80%) 36.52fps Trem: 39min 1096mb A-V:0.038 [511:125] Skipping frame! x264 [error]: 2nd pass has more frames than 1st pass (275054)0.038 [511:125] x264 [error]: continuing anyway, at constant QP=25 mencoder: encoder/slicetype.c:376: x264_slicetype_analyse: Assertion `h->frames.b_have_lowres' failed. Aborted as error. The first pass is fine Command line for the 1st pass is mencoder video.avi -o reencoded/video.avi -oac mp3lame -lameopts abr=128 -ovc x264 -x264encopts bitrate=512:subq=4:pass=1:turbo=1:threads=4 -vf scale=384:288,dsize=512:288 -srate 44100 -ofps 24 Command line for the 2nd pass is mencoder video.avi -o reencoded/video.avi -oac mp3lame -lameopts abr=128 -ovc x264 -x264encopts bitrate=512:subq=6:partitions=all:8x8dct:me=umh:frameref=5:pass=2:threads=4 -vf scale=384:288,dsize=512:288 -srate 44100 -ofps 24 any ideas?