FFMPEG command issue for merging mp4 videos in android -


i using following ffmpeg command merging mp4 videos in android. video rotated 90 degree after merging.

i stuck 2 days .if idea highly appriciated.

thanks in advance !

complexcommand = new string[] {                 "ffmpeg",                 "-y",                 "-i",                 recordpath + "vid1.mp4",                 "-i",                 recordpath + "vid2.mp4",                 "-strict",                 "experimental",                 "-filter_complex",                 "[0:v]scale=w=640:h=480[v1]; [1:v]scale=w=640:h=480[v2]; [v1][0:a][v2][1:a] concat=n=2:v=1:a=1 [v] [a]",                 "-map", "[v]", "-map", "[a]", "-b", "2097k", "-vcodec",                 "mpeg4","-ab","64k","-ac","2","-ar","22050", recordpath + "outputnew.mp4"};

below working command merging 2 videos , maintaining aspect ratio of both

complexcommand = new string[]{"-y", "-i", file1.tostring(), "-i", file2.tostring(), "-strict", "experimental", "-filter_complex",                 "[0:v]scale=iw*min(1920/iw\\,1080/ih):ih*min(1920/iw\\,1080/ih), pad=1920:1080:(1920-iw*min(1920/iw\\,1080/ih))/2:(1080-ih*min(1920/iw\\,1080/ih))/2,setsar=1:1[v0];[1:v] scale=iw*min(1920/iw\\,1080/ih):ih*min(1920/iw\\,1080/ih), pad=1920:1080:(1920-iw*min(1920/iw\\,1080/ih))/2:(1080-ih*min(1920/iw\\,1080/ih))/2,setsar=1:1[v1];[v0][0:a][v1][1:a] concat=n=2:v=1:a=1",                 "-ab", "48000", "-ac", "2", "-ar", "22050", "-s", "1920x1080", "-vcodec", "libx264", "-crf", "27", "-q", "4", "-preset", "ultrafast", rootpath + "/output.mp4"};

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