On 2016-06-11, Grant Edwards <grant.b.edwa...@gmail.com> wrote: > I'm trying to do a simple fade-in (audio and video) at the beginning > and fade-out at the end of a video clip. According to numerous > examples, I thought this should do it: > > melt \ > colour:black out=100 \ > infile.mp4 \ > -mix 100 -mixer luma -mixer mix:-1 \ > colour:black out=100 \ > -mix 100 -mixer luma -mixer mix:-1 \ > -consumer avformat:outfile.mp4 acodec=aac vcodec=libx264 > > > But the audio dosn't fade in or out. It comes on full volume at the > start of the output and stays full volume until the output ends.
The problem appears to be that "colour:black" doesn't have an audio track, so "-mixer mix:-1" does nothing. IMO, a more intuitive result would be to treat "no audio track" as silence and fade to/from silence. I ended up creating an acutal mp4 video clip containing black frames plus a silent audio track and using that instead of colour:black. That works as expected, but it seems like a bit of a kludge. There's probably a smarter way to do it, but I haven't been able to figure out what it is. :/ -- Grant ------------------------------------------------------------------------------ What NetFlow Analyzer can do for you? Monitors network bandwidth and traffic patterns at an interface-level. Reveals which users, apps, and protocols are consuming the most bandwidth. Provides multi-vendor support for NetFlow, J-Flow, sFlow and other flows. Make informed decisions using capacity planning reports. https://ad.doubleclick.net/ddm/clk/305295220;132659582;e _______________________________________________ Mlt-devel mailing list Mlt-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/mlt-devel
