On 4/16/20, Mark Filipak <[email protected]> wrote: > To overcome a problem, I'm trying to understand the propagation of frames in > a filter complex. > > Filter graph: > > split[A] select='not(eq(mod(n+1\,5)\,3))' [C]interleave > [B]split[D]select='eq(mod(n+1\,5)\,2)'[F]blend[D] > [E]select='eq(mod(n+1\,5)\,3)'[G] > > What I expected/hoped: > > split[A] 0 1 _ 3 4 [C]interleave 0 1 B 3 4 //5 frames > [B]split[D] _ 1 _ _ _ [F]blend[D] | > [E] _ _ 2 _ _ [G] blend of 1+2 > > What appears to be happening: > > split[A] 0 1 _ 3 4 [C]interleave 0 1 _ 3 4 //4 frames > [B]split[D] _ _ _ _ _ [F]blend[D] > [E] _ _ 2 _ _ [G] > > The behavior is as though because frame n+1==1 can take the [A][C] path, it > does take it & that > leaves nothing left to also take the [B][D][F] path, so blend never outputs. > > I've used 'datascope' in various parts of the filter graph in an attempt to > confirm this on my own. > It's difficult because my test video doesn't display frame #s. >
Use testsrc2 filter? > If that indeed is the behavior, then ... > > I need a way to duplicate a frame, # n+1%5==1 in this case, so that the > 'blend' operates. > > Thanks for your thoughts, > Mark. > > _______________________________________________ > ffmpeg-user mailing list > [email protected] > https://ffmpeg.org/mailman/listinfo/ffmpeg-user > > To unsubscribe, visit link above, or email > [email protected] with subject "unsubscribe". _______________________________________________ ffmpeg-user mailing list [email protected] https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email [email protected] with subject "unsubscribe".
