Hi Alex, thank you for your reply, I tried 0.9 and got the same issue. In fact I even tried without segmenting the video, just adding vbv-init and vbv-end and encoding the entire video at once. vbv-end-fr-adj can only be enabled if the total number of frames is known. The '--frames' option seems to be CLI only (see below), and the '-frames:v' from ffmpeg is not recognized by x265 (shouldn't it be?).
If I try to use frames=15866 [libx265 @ 0x49c7240] Unknown option: frames. If I try to add -framed:v to ffmpeg: x265 [error]: vbv-end-fr-adj cannot be enabled when total number of frames is unknown Em qui., 29 de out. de 2020 às 19:34, Alex Giladi <alex.gil...@gmail.com> escreveu: > Hi Diego, > I would try 0.9 as opposed to 0.5 on both vbv-init and vbv-end. > There is also an optional --vbv-end-fr-adj parameter, you may want to > play with it. May want to tune it, 12+ frames is best at hiding the > stitch point. > Best, > Alex. > > On Thu, Oct 29, 2020 at 12:23 PM Diego Pasqualin <dpasqua...@gmail.com> > wrote: > > > > Hi, I'm revisiting some parameters in our chunked encoding pipeline and > I stumbled upon vbv-init and vbv-end, which seems to be recommended for the > use case (https://x265.readthedocs.io/en/3.1/cli.html#cmdoption-vbv-init). > However, if I set these two parameters I get really bad artifacts, > strangely more intense in the right bottom part of the output video. I took > this screenshot as example https://pasteboard.co/JxVhD78.png > > > > This is the full ffmpeg command. If I remove the vbv-init/vbv-end it > encodes nicely without artifacts. Any idea on what might be going on? Thank > you very much! > > > > ffmpeg -fflags +genpts -i big-buck-bunny.mp4 -map 0:v -bf 3 -refs 3 -crf > 21 -force_key_frames expr:gte(t,n_forced*2) -g 50 -keyint_min 50 > -x265-params > "hrd=1:vbv-init=0.5:vbv-end=0.5:vbv-maxrate=1870:vbv-bufsize=3740:keyint=50:min-keyint=50:no-open-gop=1:bframes=3:ref=3:level=40:limit-modes=1:rect=1:amp=1" > -c:v libx265 -flags +cgop -map_chapters -1 -map_metadata -1 -pix_fmt > yuv420p -preset medium -profile:v main -r 25 -vsync cfr -sws_flags bicubic > -filter:v scale=trunc((oh*iw*sar/ih)/2)*2:720 -an -dn -sn -y ./output.mp4 > > _______________________________________________ > > x265-devel mailing list > > x265-devel@videolan.org > > https://mailman.videolan.org/listinfo/x265-devel > _______________________________________________ > x265-devel mailing list > x265-devel@videolan.org > https://mailman.videolan.org/listinfo/x265-devel >
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