How to best convert Flash compatible mp4 files with FFMPEG?

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北恋
北恋 2021-01-30 02:32

I am trying to convert different files to a flash compatible .mp4 file with ffmpeg, but I can\'t seem to get it to work. Of course the objective is to get the great

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  •  醉梦人生
    2021-01-30 03:13

    In my snippet collection I have the following for this task.

    ffmpeg first pass:

    ffmpeg -y -i input.mp4 -pass 1 -vcodec libx264 -b 2000k -g 300 -bf 3 -refs 6 -b_strategy 1 -coder 1 -qmin 10 -qmax 51 -sc_threshold 40 -flags +loop -cmp +chroma -me_range 16 -me_method umh -subq 7 -i_qfactor 0.71 -qcomp 0.6 -qdiff 4 -directpred 3 -flags2 +dct8x8+wpred+bpyramid+mixed_refs -trellis 1 -partitions +parti8x8+parti4x4+partp8x8+partp4x4+partb8x8 -acodec libfaac -ab 128k output.mp4
    

    ffmpeg second pass:

    ffmpeg -y -i input.mp4 -pass 2 -vcodec libx264 -b 2000k -g 300 -bf 3 -refs 6 -b_strategy 1 -coder 1 -qmin 10 -qmax 51 -sc_threshold 40 -flags +loop -cmp +chroma -me_range 16 -me_method umh -subq 7 -i_qfactor 0.71 -qcomp 0.6 -qdiff 4 -directpred 3 -flags2 +dct8x8+wpred+bpyramid+mixed_refs -trellis 1 -partitions +parti8x8+parti4x4+partp8x8+partp4x4+partb8x8 -acodec libfaac -ab 128k output.mp4
    

    The quality setting are 2000k = video bitrate, 128k = audio bitrat and 300 = GOP. Don't ask me what the other parameters are. :)

    Interleaving with MP4Box:

    MP4Box -inter 500 output.mp4
    

    Create a thumbnail / poster image (play around with 5 to obtain your desired image)

    ffmpeg -itsoffset -5 -i output.mp4 -vcodec mjpeg -vframes 1 -an -f rawvideo -s 1280x720 thumbnail.jpg
    

    Hope this helps.

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