Thanks for answering ! I took some time to understand the jpg frequency at 25fps. I made the following modifications and it works very well :
ffmpeg -framerate 30 -loop 1 -i participant1.jpg -framerate 30 -i participant1.jpg -filter_complex "\ [0]split=2[v1][v2];\ [v2]format=rgba,lut3d='red.cube'[v3];\ [v3]fade=in:st=0.25:d=2.93:alpha=1[ov];\ [v1][ov]overlay[bg];\ [bg][1]overlay=enable='eq(n,109)'[out1];\ [out1][1]overlay=enable='eq(n,111)'[out2];\ [out2][1]overlay=enable='eq(n,113)'[out3];\ [out3][1]overlay=enable='eq(n,115)'[outv]"\ -map "[outv]" -c:v libx264 -t 8 -pix_fmt yuv420p -r 30 output.mp4 Le sam. 16 déc. 2023 à 23:36, Michael Koch <astroelectro...@t-online.de> a écrit : > Am 16.12.2023 um 19:51 schrieb emmanuel martin: > > I have two inputs that are the same image. The first one, I loop to > create > > a video for 8 seconds. I also create two streams that I will overlay. The > > background is the normal video, and above it is the same video with a LUT > > (Look-Up Table) that I applied earlier. I make the top video appear as an > > overlay with a fade-in effect that lasts x seconds before reaching 100%. > To > > create a 'flash' effect, I want to overlay instances of my base image > > (participant1.jpg) at different very close intervals. The first overlay > > displays, but not this one > > "[out][1]overlay=enable='between(t,3.25,3.26)'[outv]", and I can't figure > > out the reason. Have I made a mistake somewhere? Thank you very much for > > your valuable advice :) > > > > ffmpeg -loop 1 -i participant1.jpg -i participant1.jpg -filter_complex "\ > > [0]split=2[v1][v2];\ > > [v2]format=rgba,lut3d='red.cube'[v3];\ > > [v3]fade=in:st=0.25:d=2.93:alpha=1[ov];\ > > [v1][ov]overlay[bg];\ > > [bg][1]overlay=enable='between(t,3.20,3.21)'[out];\ > > [out][1]overlay=enable='between(t,3.25,3.26)'[outv]"\ > > -map "[outv]" -c:v libx264 -t 8 -pix_fmt yuv420p output.mp4 > > The default framerate is 25. Time from one frame to the next is 0.04s. > The 80th frame has timestamp 80*0.04 = 3.20s > The 81th frame has timestamp 81*0.04 = 3.24s > The 82th frame has timestamp 82*0.04 = 3.28s > Which means there is a frame in the [3.20 .. 3.21] interval, but there > is no frame in the [3.25 .. 3.26] interval. > > Michael > > _______________________________________________ > ffmpeg-user mailing list > ffmpeg-user@ffmpeg.org > https://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 https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
