Re: [FFmpeg-user] Use ffmpeg to delay webcam feed with dshow displayed locally
> I'm curious though, what happens function / command wise when you hit the > pause key because this ends up producing the results I'm looking for. When > you hit the pause key and then 10 seconds un-pause it, you end up with a live > stream which is 10 seconds delayed. I don’t know, but it isn’t ffmpeg that does this. It must be the sdl library. > I guess what you are saying is there is not a good way to replicate that > using the filters or other options? It’s something I would have used ffserver for, now I don’t think there’s a way without writing to an intermediate streaming format. > Ok, I will try to get this delay with a file, or something like that. And it doesn’t have to be a regular file, it shouldn’t be if you don’t want a full recording. You could pipe a stream to another FFmpeg, write to a fifo, unix socket, something that functions as a circular buffer. ___ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
Re: [FFmpeg-user] Use ffmpeg to delay webcam feed with dshow displayed locally
Hi Ted, Thanks again for all your suggestions. Ok, I will try to get this delay with a file, or something like that. I'm curious though, what happens function / command wise when you hit the pause key because this ends up producing the results I'm looking for. When you hit the pause key and then 10 seconds un-pause it, you end up with a live stream which is 10 seconds delayed. I guess what you are saying is there is not a good way to replicate that using the filters or other options? Scott On Thursday, February 14, 2019, 1:28:59 PM PST, Ted Park wrote: > ./ffmpeg.exe -f dshow -video_size 160x120 -framerate 30 -i video="Integrated > Webcam" -filter setpts=expr=PTS+10/TB -pix_fmt yuv420p -f sdl ohhh wait. SDL gives you a hw surface to draw on if I understand correctly? So it will happily gobble up frames and draw them fast as it can whenever it gets it, I doubt they are even timestamped. You need the 10 seconds of delayed frames to be stored anyway (I was thinking of keeping them in memory) so I would say just write to file and play back after delay. There is no output at realtime function. ___ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org http://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 http://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
Re: [FFmpeg-user] Use ffmpeg to delay webcam feed with dshow displayed locally
> ./ffmpeg.exe -f dshow -video_size 160x120 -framerate 30 -i video="Integrated > Webcam" -filter setpts=expr=PTS+10/TB -pix_fmt yuv420p -f sdl ohhh wait. SDL gives you a hw surface to draw on if I understand correctly? So it will happily gobble up frames and draw them fast as it can whenever it gets it, I doubt they are even timestamped. You need the 10 seconds of delayed frames to be stored anyway (I was thinking of keeping them in memory) so I would say just write to file and play back after delay. There is no output at realtime function. ___ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
Re: [FFmpeg-user] Use ffmpeg to delay webcam feed with dshow displayed locally
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*100)' -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*100)' -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*100)' -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 \($this_date+10\)*100|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*100)' -pix_fmt yuv420p -f sdl2 "SDL_OUT" export this_date=`date +%s`;this_date=`echo \($this_date+10\)*100|bc`;./ffmpeg.exe -f dshow -video_size 160x120 -framerate 30 -i video="Integrated Webcam" -filter setpts='(RTCTIME-RTCSTART+10)/(TB*100)',cue=cue=$this_date:buffer=20 -pix_fmt yuv420p -f sdl2 "SDL_OUT" export this_date=`date +%s`;this_date=`echo \($this_date+5\)*100|bc`;./ffmpeg.exe -f dshow -video_size 160x120 -framerate 30 -i video="Integrated Webcam" -filter fifo,cue=cue=$this_date:buffer=20 -pix_fmt yuv420p -f sdl2 "SDL_OUT" On Thursday, February 14, 2019, 5:23:20 AM PST, Ted Park wrote: > It shows a white output screen for 10 seconds, then it shows what appears to > be a very fast set of "catchup" frames for a fraction of a second, then > shows the live video stream again with no delay. Oh. :s Does chaining setpts=expr=PTS+$DELAY/TB work? (Sorry I’m throwing all the spaghetti against the wall till something sticks) ___ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org http://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 http://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
Re: [FFmpeg-user] Use ffmpeg to delay webcam feed with dshow displayed locally
> 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) ___ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
Re: [FFmpeg-user] Use ffmpeg to delay webcam feed with dshow displayed locally
Hi Ted, Thank you so much for your help and suggestions. I tried a few different permutations of what you recommended, but without luck. :( It seems that nothing I'm trying does anything other than *delay the start* of the video. The video itself still isn't delayed. For example, I tried the following command:export this_date=`date +%s`;this_date=`echo \($this_date+10\)*100|bc`;./ffmpeg.exe -f dshow -video_size 160x120 -framerate 30 -i video="Integrated Webcam" -pix_fmt yuv420p -filter:v cue=cue=$this_date:buffer=20 -f sdl2 "SDL OUT" 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. Commandline output is below. Thanks again for your help with this! -Scott ** Commandline output** libavcodec 58. 46.100 / 58. 46.100 libavformat 58. 26.100 / 58. 26.100 libavdevice 58. 6.101 / 58. 6.101 libavfilter 7. 48.100 / 7. 48.100 libswscale 5. 4.100 / 5. 4.100 libswresample 3. 4.100 / 3. 4.100 libpostproc 55. 4.100 / 55. 4.100 Input #0, dshow, from 'video=Integrated Webcam': Duration: N/A, start: 93371.403000, bitrate: N/A Stream #0:0: Video: rawvideo (YUY2 / 0x32595559), yuyv422, 160x120, 30 fps, 30 tbr, 1k tbn, 1k tbc Stream mapping: Stream #0:0 -> #0:0 (rawvideo (native) -> rawvideo (native)) Press [q] to stop, [?] for help Output #0, sdl,sdl2, to 'SDL OUT': Metadata: encoder : Lavf58.26.100 Stream #0:0: Video: rawvideo (I420 / 0x30323449), yuv420p, 160x120, q=2-31, 6912 kb/s, 30 fps, 30 tbn, 30 tbc Metadata: encoder : Lavc58.46.100 rawvideo [sdl,sdl2 @ 0257dc497180] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 73 >= 73 [sdl,sdl2 @ 0257dc497180] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 84 >= 84 [sdl,sdl2 @ 0257dc497180] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 97 >= 97 [sdl,sdl2 @ 0257dc497180] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 109 >= 109 [sdl,sdl2 @ 0257dc497180] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 120 >= 120 [sdl,sdl2 @ 0257dc497180] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 133 >= 133 [sdl,sdl2 @ 0257dc497180] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 144 >= 144 [sdl,sdl2 @ 0257dc497180] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 252 >= 252 [sdl,sdl2 @ 0257dc497180] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 264 >= 264 [sdl,sdl2 @ 0257dc497180] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 276 >= 276 [sdl,sdl2 @ 0257dc497180] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 289 >= 289 [sdl,sdl2 @ 0257dc497180] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 300 >= 300 [sdl,sdl2 @ 0257dc497180] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 312 >= 312 av_interleaved_write_frame(): I/O errore=00:00:13.66 bitrate=N/A speed= 1x frame= 423 fps= 30 q=-0.0 Lsize=N/A time=00:00:14.16 bitrate=N/A speed= 1x On Wednesday, February 13, 2019, 6:50:32 AM PST, Ted Park wrote: > Hi - it very well might, but I'm not sure how to combine those. Would you > be willing to give me an example? There is a buffer parameter for the cue filter, you can just set it a reasonable number of seconds bigger than your delay introduced by cue. In bash, you can set something like cue=cue=(`date +%s`+$DELAY)*100:buffer=20 (The cue timestamp is in microseconds) ___ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org http://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 http://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
Re: [FFmpeg-user] Use ffmpeg to delay webcam feed with dshow displayed locally
> Hi - it very well might, but I'm not sure how to combine those. Would you be > willing to give me an example? There is a buffer parameter for the cue filter, you can just set it a reasonable number of seconds bigger than your delay introduced by cue. In bash, you can set something like cue=cue=(`date +%s`+$DELAY)*100:buffer=20 (The cue timestamp is in microseconds) ___ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
Re: [FFmpeg-user] Use ffmpeg to delay webcam feed with dshow displayed locally
Hi - it very well might, but I'm not sure how to combine those. Would you be willing to give me an example? Thanks again! On Tue, 2/12/19, Ted Park wrote: Subject: Re: [FFmpeg-user] Use ffmpeg to delay webcam feed with dshow displayed locally To: "FFmpeg user questions" Date: Tuesday, February 12, 2019, 12:18 PM Oh. I thought you had the opposite problem for some reason. Using cue with buffer didn’t do this for you? ___ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org http://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 http://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
Re: [FFmpeg-user] Use ffmpeg to delay webcam feed with dshow displayed locally
Oh. I thought you had the opposite problem for some reason. Using cue with buffer didn’t do this for you? ___ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
Re: [FFmpeg-user] Use ffmpeg to delay webcam feed with dshow displayed locally
Hi Ted, Thanks for your quick response! I tried this, and it basically popped up the video window and left it blank for a while, then transitioned directly to a non-delayed video feed.ffmpeg.exe -f dshow -video_size 160x120 -framerate 30 -i video="Integrated Webcam" -pix_fmt yuv420p -filter:v tpad=start_duration=500 -f sdl2 "SDL OUT" I also tried the following which cloned the first frame for a while, then went to a non-delayed video feed:ffmpeg.exe -f dshow -video_size 160x120 -framerate 30 -i video="Integrated Webcam" -pix_fmt yuv420p -filter:v tpad=start=2000:start_mode=clone -f sdl2 "SDL OUT" So neither one appears to be actually delaying the full video feed - only delaying the *start* of the video which then jumps back to real time after that initial delay. Am I implementing the tpad filter the way you were thinking? Thanks again for your help!! Scott On Tuesday, February 12, 2019, 10:50:08 AM PST, Ted Park wrote: > On Feb 12, 2019, at 12:44 PM, scott denton > wrote: > > I have tried to use various filters such as cue, loop, and buffer, as well as > itsoffset but haven't been able to get it to actually delay. Try the tpad filter. ___ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org http://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 http://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
Re: [FFmpeg-user] Use ffmpeg to delay webcam feed with dshow displayed locally
> On Feb 12, 2019, at 12:44 PM, scott denton > wrote: > > I have tried to use various filters such as cue, loop, and buffer, as well as > itsoffset but haven't been able to get it to actually delay. Try the tpad filter. ___ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
