Hi Alex, sorry to bother, could you please just confirm whether --frames:v or -x265-params "frames=N" should indeed be passed and recognized by x265? I could open a ticket on ffmpeg github.
Thank you. Em qui., 29 de out. de 2020 às 20:43, Diego Pasqualin <dpasqua...@gmail.com> escreveu: > 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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