[FFmpeg-user] Multiple overlays at specific times

[emmanuel martin]

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 <astroelectronic at 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
>
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