Hi I forgot to speak about the timebases in use, and those are important in this case.
For my two inputs, after decoding, my AVCodecContexts have the following framerates and timebases: in0 => 30/1, 1/60 in1 => 359/12, 6/359 // Well this is not exactly 30fps, but close. The common selected timebase by the framesync filter is 1/21540. Here are some of the ptss feeded to the filter: in0: pts in original tb: 16(1/60), pts in tb used by framesync: 5744 in0: pts in original tb: 18(1/60), pts in tb used by framesync: 6462 in0: pts in original tb: 20(1/60), pts in tb used by framesync: 7180 in0: pts in original tb: 22(1/60), pts in tb used by framesync: 7898 in0: pts in original tb: 24(1/60), pts in tb used by framesync: 8616 in1: pts in original tb: 17(6/359), pts in tb used by framesync: 6120 in1: pts in original tb: 19(6/359), pts in tb used by framesync: 6840 in1: pts in original tb: 21(6/359), pts in tb used by framesync: 7560 in1: pts in original tb: 23(6/359), pts in tb used by framesync: 8280 in1: pts in original tb: 25(6/359), pts in tb used by framesync: 9000 The ptss of the two inputs are interleaved and that is why the vstack filter triggers twice. Another possible solution to my problem would be to force the timebases to 1/framerate, this would prevent the interleaving of the frames, something like this: " [in0]format=pix_fmts=yuv420p,scale=-1:540,settb=expr=1/30[s0]; [in1]format=pix_fmts=yuv420p,scale=-1:540,settb=expr=1/30[s1]; [s0][s1]vstack[stacked]; [stacked]pad=1920:1080:(ow-iw)/2:0[out0] " Would this work? Is there a better, more general approach of solving this problem. For inputs with different framerates my plan is to select the greatest and use that, something like this: " [in0]format=pix_fmts=yuv420p,scale=-1:540,settb=expr=1/greatestFps,fps=fps= greatestFps[s0]; [in1]format=pix_fmts=yuv420p,scale=-1:540,settb=expr=1/greatestFps,fps=fps= greatestFps[s1]; [s0][s1]vstack[stacked]; [stacked]pad=1920:1080:(ow-iw)/2:0[out0] " Thanks. >
_______________________________________________ Libav-user mailing list Libav-user@ffmpeg.org http://ffmpeg.org/mailman/listinfo/libav-user To unsubscribe, visit link above, or email libav-user-requ...@ffmpeg.org with subject "unsubscribe".