Hi Ted,
Thank you - I definitely appreciate all of the suggestions. It seems like with
the cue filter, frames are getting buffered and then at the end of the start
delay, they all play through really quickly. It makes me wonder if there isn't
some index that needs to be updated to basically tell it to not start at the
beginning, but somewhere in the middle of the buffer. You can see I tried
using setpts in combination with the cue filter, and also tried adding the fifo
statement but I really don't know how any of these interact. I'm wondering if
there is some combination of buffer filter and cue filter? I'm having a hard
time getting the buffer statement to work.
I tried all of the following (and more), but with no success.
All of the following just shows live input:
./ffmpeg.exe -f dshow -video_size 160x120 -framerate 30 -i video="Integrated
Webcam" -filter setpts=expr=PTS+10/TB -pix_fmt yuv420p -f sdl2 "SDL_OUT"
$ ./ffmpeg.exe -f dshow -video_size 160x120 -framerate 30 -i video="Integrated
Webcam" -filter setpts='expr=PTS+10/(TB*1000000)' -pix_fmt yuv420p -f sdl2
"SDL_OUT"
$ ./ffmpeg.exe -f dshow -video_size 160x120 -framerate 30 -i video="Integrated
Webcam" -filter setpts='(RTCTIME-RTCSTART+10)/(TB*1000000)' -pix_fmt yuv420p -f
sdl2 "SDL_OUT"
$ ./ffmpeg.exe -f dshow -video_size 160x120 -framerate 30 -i video="Integrated
Webcam" -filter setpts='(RTCTIME-RTCSTART-10)/(TB*1000000)' -pix_fmt yuv420p -f
sdl2 "SDL_OUT"
All of the following shows a delayed start to the video (blank white screen),
then realtime video:
export this_date=`date +%s`;this_date=`echo
\($this_date+10\)*1000000|bc`;./ffmpeg.exe -f dshow -video_size 160x120
-framerate 30 -i video="Integrated Webcam" -filter
cue=cue=$this_date:buffer=20,setpts='(RTCTIME-RTCSTART+10)/(TB*1000000)'
-pix_fmt yuv420p -f sdl2 "SDL_OUT"
export this_date=`date +%s`;this_date=`echo
\($this_date+10\)*1000000|bc`;./ffmpeg.exe -f dshow -video_size 160x120
-framerate 30 -i video="Integrated Webcam" -filter
setpts='(RTCTIME-RTCSTART+10)/(TB*1000000)',cue=cue=$this_date:buffer=20
-pix_fmt yuv420p -f sdl2 "SDL_OUT"
export this_date=`date +%s`;this_date=`echo
\($this_date+5\)*1000000|bc`;./ffmpeg.exe -f dshow -video_size 160x120
-framerate 30 -i video="Integrated Webcam" -filter
fifo,cue=cue=$this_date:buffer=20 -pix_fmt yuv420p -f sdl2 "SDL_OUT"
On Thursday, February 14, 2019, 5:23:20 AM PST, Ted Park
<[email protected]> wrote:
> It shows a white output screen for 10 seconds, then it shows what appears to
> be a very fast set of "catchup" frames for a fraction of a second, then
> shows the live video stream again with no delay.
Oh. :s Does chaining setpts=expr=PTS+$DELAY/TB work? (Sorry I’m throwing all
the spaghetti against the wall till something sticks)
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