[FFmpeg-user] concatenate png files for different durations?

[Spencer Graves]

       How can I display a sequence of png files for different time 
durations and mate them with a single audio?


       Attached is a toy example:  I want to display tst1.png for 0.5 
seconds followed by tst2.png for 1.5 seconds and merge that video with 
the audio in tst2.mp2.


       If I don't care about the display time for each image, I can 
merge these 2 png and 1 mp2 files with "ffmpeg -y -r 1 -i tst.mp2 -r 2 
-i tst%d.png -b 300k tst.mp4".


       The documentation describes "concat" for filter, demuxer, 
protocol, and raw.  I was unable to see how any of these would solve 
this problem.


       Thanks,
       Spencer


p.s.  I'm using ffmpeg version N-61163-gd1122b7 Copyright (c) 2000-2014 
the FFmpeg developers built on Mar  7 2014 22:01:29 with gcc 4.8.2 (GCC) 
under Windows 7 Home Edition with a dual core Intel processor, 8 GB RAM, 
and lots of free hard drive.

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