----- Mensaje original -----
> De: "Nicolas George" <[email protected]>
> Para: "FFmpeg user questions" <[email protected]>
> Enviados: Jueves, 27 de Junio 2019 10:35:04
> Asunto: Re: [FFmpeg-user] pipe from /dev/video to /dev/video adding a delay -
> syncing issues
>
> Javier Infante Porro (12019-06-26):
> > But whenever i try to push the stream back to the the /dev/video20
> > device, it works, but the countdown goes real fast (like 10x faster),
> > and then video tries to catch up and keeps around a 2 second delay:
>
> For a regular countdown, you need an accurate timestamp. You are killing
> your timestamps with the setpts filter: why do you do it?
I am not using it anymore... it's something i forgot inside the filter chain...
Right now i am using the -re switch (as Moritz suggest me in this thread), but
whenever the countdown finishes, thy video from /dev/video0 tries to "recover"
the lost time...
I am guessing it has sometyhing to do with the "-ts parameter on the v4l2
input or maybe using the pts filter... but i am out of luck so far.
TIME=5
ffmpeg -y -re \
-loop 1 -r 28 -t $TIME -i bg.jpg \
-f v4l2 -thread_queue_size 512 -framerate 28 -i /dev/video30 \
-filter_complex \
"[0:v:0]drawtext=fontfile='/usr/share/fonts/truetype/msttcorefonts/Georgia.ttf':fontcolor=yellow:fontsize=40=(w-text_w)/2:y=(h-text_h)/2:text=\'%{eif\:$TIME+1-t\}\'[count];
\
[1:v:0]fps=28,setpts=PTS+$TIME/TB[live];[count] [live]
concat=n=2:v=1:a=0:unsafe=1 [v];[v]scale=852:480[out]" \
-map "[out]" -an -pix_fmt yuv420p -f v4l2 -r 28 /dev/video20
Any ideas on what am I missing?
--
Jabi
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