FFmpeg

@FFmpeg

The universal multimedia toolkit.

Vrijeme pridruživanja: ožujak 2013.

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  1. 21. sij

    Seeking help from Synology users. Can you verify that Synology provides ffmpeg? If yes, can you run the "ffmpeg" command and show a screenshot of the output? (We are looking for screenshots of ffmpeg specifically provided by Synology, but not SynoCommunity.)

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  2. 6. sij

    . has been submitting patches to FFmpeg for the last few years. Noteworthy due to the small number of contributions we get from other large corporate users. Would be good to see others doing the same.

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  3. 17. pro 2019.

    Delay audio with the adelay filter. ffmpeg -i input -filter_complex "adelay=5s|5s" output Can be combined with tpad to do the same for video.

    Wave form of delayed audio using the adelay filter.
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  4. 16. pro 2019.

    Try it: ffmpeg \ -f lavfi -i color=c=random:s=256x720 \ -f lavfi -i color=c=random:s=256x720 \ -f lavfi -i color=c=random:s=256x720 \ -f lavfi -i color=c=random:s=256x720 \ -filter_complex "[0][1][2][3]hstack=inputs=4" -frames:v 1 color.png

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  5. 16. pro 2019.

    'random' is an acceptable value for video filters that allow you to choose a color (pad, color, drawbox, drawgrid, drawtext, fade, fillborders, life, rotate, tile, tpad).

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  6. proslijedio/la je Tweet
    9. pro 2019.

    . have not responded at all to my LGPL request for , I expect this of smaller companies, not ones the size of Riot. What's the next step?

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  7. proslijedio/la je Tweet
    6. pro 2019.

    FFfriday FFfans with developer Carl

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  8. 4. pro 2019.

    Stack videos/images with the *stack filters: ffmpeg -i left.mp4 -i right.mp4 -filter_complex hstack output.mp4 ffmpeg -i top.mp4 -i bottom.mp4 -filter_complex vstack output.mp4 hstack, vstack, xstack –

    Example of 2x2 grid from xstack filter.
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  9. 3. pro 2019.

    FFv1 is a lossless video format that supports many pixel formats.

    List of pixel formats supported by FFv1. Refer to output of command "ffmpeg -h encoder=ffv1".
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  10. proslijedio/la je Tweet
    17. stu 2019.

    What stuff you need in FFmpeg?

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  11. proslijedio/la je Tweet
    22. stu 2019.

    Hello users (esp. archivists)! I'm giving a talk at soon on reading FFmpeg logs -- Have you recently run into an annoying error, or remember a particularly bad one, and can you share the log with me so I can debug it for you and everyone else?

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  12. proslijedio/la je Tweet
    10. stu 2019.

    With rav1e's first release, I've landed support for librav1e in . No more piping or Y4Ms for the masses!

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  13. 30. lis 2019.

    Add timestamp with drawtext: ffmpeg -i input -vf "drawtext=text='%{pts\:hms}':fontsize=48:fontcolor=white:box=1:boxborderw=6:boxcolor=black@0.75:x=(w-text_w)/2:y=h-text_h-20" -c:a copy output.mp4 Works best with a monospace font (see font/fontfile options).

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  14. 22. lis 2019.

    Add text to your video with the drawtext filter: ffmpeg -i input.mp4 -vf "drawtext=text='FFpmeg is teh best'" -c:a copy output.mp4 drawtext -

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  15. proslijedio/la je Tweet
    21. lis 2019.

    Use transpose filter a lot in ? enjoy in nice speed boost in latest master on x86 architecture.

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  16. 15. lis 2019.

    Generate a 5 second, 1920x1080, 24 fps test pattern and 440 Hz sine w/ beep: ffmpeg -f lavfi -i testsrc=d=5:s=1920x1080:r=24,format=yuv420p -f lavfi -i sine=f=440:b=4 -shortest output.mp4 Also try testsrc2 for a different pattern.

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  17. 8. lis 2019.

    Get info and options about specific components: ffmpeg -h filter=overlay ffmpeg -h encoder=libx264 ffmpeg -h decoder=aac ffmpeg -h muxer=mp4 ffmpeg -h demuxer=gif

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  18. 1. lis 2019.
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  19. 30. ruj 2019.

    List all filters: ffmpeg -filters List all encoders: ffmpeg -encoders List all decoders: ffmpeg -decoders List all muxers: ffmpeg -muxers List all demuxers: ffmpeg -demuxers List all devices: ffmpeg -devices List all protocols: ffmpeg -protocols

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  20. 20. ruj 2019.

    (M)JPEG quality isn't only affected by -q:v. The "pixel format" or subsampling matters too: yuvj420p vs yuvj422p vs yuvj444p. See the format filter or the -pix_fmt option.

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