Hello, Yes, I already have the moving objects' coordinates (x, y values, the box's width and height, as well as the duration of the blur). I only need to use ffmpeg to blur that object in the video according to the provided coordinates. I have a working solution, but it becomes very slow the more blurred overlays I have.
This is what I've tried with sendcmd to see if it could improve performance: ffmpeg -i "input.mp4" -filter_complex "[0:v]sendcmd=f=cropmask.cmd,crop=100:100:60:30,boxblur=10[fg]; [0:v][fg]overlay=60:30[v]" -map "[v]" -y ouput.mp4 Contents of cropmask.cmd: 1-2 [enter] crop w 20, [enter] crop h 20, [enter] crop x 50, [enter] crop y 50, [enter] overlay x 50, [enter] overlay y 50; 2-3 [enter] crop w 20, [enter] crop h 20, [enter] crop x 150, [enter] crop y 150, [enter] overlay x 150, [enter] overlay y 150; The problem is that it applies the new box blur inside the old box blur (i.e. the original blur is 100 x 100, the blur from second 1 to second 2 becomes 20x20 but the original blur remains at 100x100 although it also moves according to the new x,y values). I believe this is because ffmpeg does a first pass to generate the crops before applying the overlays? Also the original blur image becomes "static" (i.e. it is a static blurred image moving around). Thanks! Boris On Mon, Oct 31, 2016 at 6:22 AM, Nicolas George <[email protected]> wrote: > Le decadi 10 brumaire, an CCXXV, Paul B Mahol a écrit : > > Short story: AFAIK it is not currently possible to track specific > > moving object with FFmpeg. > > I think Boris already has the coordinates of the objects and only needs > a way to inject them in FFmpeg. > > It seems boxblur can not change its coordinates on the fly. The best > course of action would be to implement process_command() for it, and it > would probably not be that hard. > > Without changing the code, since crop and overlay support > process_command(), using them to isolate the part of the image to apply > boxblur seems a workable solution, and sendcmd can do that. We do not > have enough information to know why it failed. > > (Please trim your quotes.) > > Regards, > > -- > Nicolas George > > _______________________________________________ > ffmpeg-user mailing list > [email protected] > http://ffmpeg.org/mailman/listinfo/ffmpeg-user > > To unsubscribe, visit link above, or email > [email protected] with subject "unsubscribe". > _______________________________________________ ffmpeg-user mailing list [email protected] http://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email [email protected] with subject "unsubscribe".
