java - Problem with processing FFMPEG video , the output video is totally black in first 3 seconds

Question

I want to make a slideshow by using concat demuxer like this link: https://trac.ffmpeg.org/wiki/Slideshow

Here is the textfile preinputFiles.txt:

file 'path a'
duration 2
file 'path b'
duration 2
file 'path c'
duration 2
file 'path c'

and my command array is:

String[] cmd = new String[]{
            "-f","concat","-i",
            textFile,
            "-vsync", "vfr", "-pix_fmt", "yuv420p",
            dest.getAbsolutePath()};

the video has 3 seconds that it is totally black and run from 3s to 9s even the gallery shows that it is a 6 seconds long video .

Thanks for the help!

Answer 1

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