Thank you sir. 🙏 On Mon, 27 Nov, 2023, 1:43 pm Ferdi Scholten, <fe...@sttc-nlp.nl> wrote:
> On Mon, 27 Nov, 2023, 7:32 am Aditya Dandavate, > <adityadandavat...@gmail.com> > > wrote: > > > >> On Mon, 27 Nov, 2023, 4:16 am Ferdi Scholten,<fe...@sttc-nlp.nl> > wrote: > >> > >>> What is the quality rate control when encoding in VBR mode ? > >>>> I get message : > >>>> > >>>> Svt[warn]: The input q value is ignored in vbr mode 20 when I set the > >>> -crf > >>>> to 20 when enabling the -svtav1-params rc=1. > >>>> When I set -qp 20, the conversion fails. > >>>> > >>>> Which mode to set quality when encoding in VBR mode ? > >>>> > >>> vbr encoding does not support quality setting, you get the maximum > >>> quality that fits the specified bitrate and it uses lower bitrates if > >>> possible if the content does not require high bitrates. > >>> > >>> > >>> If you want CRF with a cap on the bitrate you need to set mbr > >>> (MaximumBitRate) > >>> > >>> -crf 20 -svtav1-params mbr=5000k > >>> > >>> You do not need to specify rc=0, because that is default. You also do > not > >>> specify -b:v 5000k > >>> > >>> > >>> Or if you want VBR > >>> > >>> -svtav1-params rc=1 -b:v 5000k > >>> > >>> No quality settings like crf or qp as they require rc=0 you can however > >>> set -qmin (default 1) and -qmax (default 63) > >>> > >>> > >>> OR if you want CQP > >>> > >>> -qp 20 -svtparams aq-mode=0 -b:v 5000k > >>> > >>> qp only works when aq-mode=0 (default aq-mode=2) > >>> > >>> > >>> Hope that helps? > >> > > Also, a quick question about Constrained Quality Mode: > > > > In VP9, we trigger it by combination of '-crf' and 'b:v' and the value of > > bitrate is must be non zero to trigger the mode. > > > > How to trigger it in libsvtav1 ? > > > by setting -qp AND aq-mode=0 AND bitrate > _______________________________________________ > ffmpeg-user mailing list > ffmpeg-user@ffmpeg.org > https://ffmpeg.org/mailman/listinfo/ffmpeg-user > > To unsubscribe, visit link above, or email > ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe". > _______________________________________________ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".