[FFmpeg-user] (no subject)

owen s owen94012 at gmail.com
Wed Jan 27 14:20:15 EET 2021


adding realtime before the crop filter dropped the bitrate and increased
the encoding speed to 80x
i moved the realtime t filter after hwdownload, but the speed was still
about 1.78
I looked over the filter documentation:
https://ffmpeg.org/ffmpeg-filters.html#realtime_002c-arealtime
and noticed there's a speed or limit options; adding realtime=speed=1.04
keeps the speed at 1.04 and the problem is resolved.

Thanks for the help!

On Tue, Jan 26, 2021 at 4:47 PM Dennis Mungai <dmngaie at gmail.com> wrote:

> On Tue, 26 Jan 2021, 03:14 owen s, <owen94012 at gmail.com> wrote:
>
> > I am running this command
> >
> > ffmpeg-git -y \
> > -vaapi_device /dev/dri/renderD128 \
> > -framerate 60 -i ./image.jpg \
> > -stream_loop -1 -i ./audio.mp3 \
> > -map 0:v \
> > -c:v h264_vaapi \
> > -vf
> >
> >
> 'crop=2560:1440:0:0,format=nv12|vaapi,hwupload,loop=loop=-1:size=1:start=0,hwdownload,format=yuv420p'
> > \
> > -rc_mode 2 -b:v 20M \
> > -c:v libx264 \
> > -map 1:a \
> > -c:a libfdk_aac -b:a 128k -ar 44100 -ac 2 \
> > -af "dynaudnorm=f=150:g=15" \
> > -f flv /dev/null
> >
> > the encoding speed is very fast, typically 1.78x
> >
> > frame=2512127 fps=107 q=0.0 size=56457493kB time=11:37:47.36
> > bitrate=11046.8kbits/s speed=1.79x
> >
> > Is there any way to limit this speed to a standard 1x?
> > _______________________________________________
> >
>
>
> Add the realtime filter to your filter chain, right before crop. So you'd
> have -vf "realtime,crop..." etc
>
> >
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