On date Wednesday 2015-01-21 16:08:29 +0100, Dog Film wrote: > Hi Stefano, > > regarding timestamps - are you suggesting things that can be done with > the setpts filter? The example I posted works very well with static > images, no timestamp manipulation needed here, but I can not find a > way to add fades to all the images - how do come timestamps into play > here? > > Thanks for the suggestion, one single file with all the overlays > fading in/out was in deed my next step, but before this I wanted to > validate if there are any known limitations regarding the fade filter, > as the image-sequence-only file still will have lots of them. > > Would you or anybody else please like to point me to an example that > shows how to overlay at least three images on a source with working > fade-in and fade-out on all of this images? That would be very, very > niiiice :) BTW the repositioning of the overlays in my example is not > important, I did this just for testing (to better see if some image > overlay is hidden behind another one). > > I did not work on this in a scientific way, but the hundreds of > mutations I tried to to this without success lead me to the idea that > it might actually be a limitation of the ffmpeg tool.
> I was able to build some surprisingly complex filter graphs - but > bringing fade-in and fade-out into the elements of such a graph never > worked. Instead posting dozens of not working examples and asking what > was wrong with them, I believe it would be a better approach if > anybody could send just one working example, so we can learn from it. > BTW, this would be a great addition for the ffmpeg wiki! > > From my pov fade-in and fade-out on elements is such a basic > requirement for many video production workflows, it will be of great > value for many people to explain how this can be done efficiently with > ffmpeg. > > However, this thread will be helpful at least for me, if anybody can > confirm that atm it is *not* possible to do this with ffmpeg, so I can > stop trying to search for non existing things... You're not very explicit about you want to achieve. I think something like this should work: ffmpeg -f lavfi -i color=c=blue -frames:v 1 blue.png ffmpeg -f lavfi -i color=c=red -frames:v 1 red.png ffmpeg -f lavfi -i testsrc=s=vga -loop 1 -i blue.png -loop 1 -i red.png -filter_complex "[1:0] format=rgba,fade=in:st=0:d=5:alpha=1,fade=out:st=5:d=5:alpha=1 [t0]; [2:0] format=rgba,fade=in:st=5:d=5:alpha=1,fade=out:st=10:d=5:alpha=1 [t1]; [0:0][t0] overlay [t2];[t2][t1] overlay=x=100:y=100" -t 20 -y out.mp4 _______________________________________________ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-user
