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Thread: Fix upside-down video

  1. #1
    Join Date
    Nov 2007
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    Fix upside-down video

    Hello all,

    I have a .mov video file that was filmed upside-down on a cell phone camera. (oops)

    I'd like to flip it right-side up. How can I do this?

  2. #2
    Join Date
    Apr 2009
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    Aotearoha
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    2,661
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    Ubuntu 10.04 Lucid Lynx

    Re: Fix upside-down video

    You could try this:
    ffmpeg -i video.mpg -vf "transpose=0, transpose=3" out.mpg

    you need a version of ffmpeg with video-filters..0.9 or later

    https://launchpad.net/~jon-severinsson/+archive/ffmpeg

  3. #3
    Join Date
    Sep 2006
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    3,489

    Re: Fix upside-down video

    Another filter option:
    Code:
    ffmpeg -i input -vf vflip,hflip output

  4. #4
    Join Date
    Nov 2007
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    141

    Re: Fix upside-down video

    Sorry it took me so long to reply. I've been busy.

    Neither works for me.

    Code:
    ffmpeg: unrecognized option '-vf'
    I guess I have an older version of ffmpeg.

  5. #5
    Join Date
    Sep 2006
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    3,489

    Re: Fix upside-down video

    You can compile ffmpeg or use the PPA BicyclerBoy mentioned (I'm unsure if the version from the PPA supports filters, but it probably does). Compile guide:

    HOWTO: Install and use the latest FFmpeg and x264

    The guide will remove any existing ffmpeg, such as the one from the Ubuntu repository, but if you want to keep the repository version you can modify the guide. Simply skip the command that removes ffmpeg and then skip the ffmpeg checkinstall command. The compiled ffmpeg binary is still available, but not installed. To use it just navigate to the ffmpeg source directory and execute it:
    Code:
    cd ~/ffmpeg
    ./ffmpeg -i input -vf vflip,hflip output

  6. #6
    Join Date
    Nov 2007
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    141

    Re: Fix upside-down video

    I just decided to boot into 12.04 to do this.

    It worked somewhat, but the result is very grainy.

    I need this for a presentation on Friday. If I don't get it to look good by then, I can just invert the display output. That worked last time.

  7. #7
    Join Date
    Sep 2006
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    3,489

    Re: Fix upside-down video

    Older ffmpeg versions use a low bitrate by default. I'm unsure what the repository version does. If your output is .mpg or .mp4, then add the -qscale option. Try values from 2 to 5. A lower value is a higher quality. A value of 2 can probably be considered visually lossless.

    Note that recent versions of ffmpeg from FFmpeg default to the libx264 encoder if it is available and if the output is .mp4. If that is the case, then use -crf instead of -qscale or just use the default since it's not bad. I don't use "ffmpeg"/avconv from libav (which is what Ubuntu now uses), so I can't comment on its behavior.

    So, to summarize, just add -qscale 2.

  8. #8
    Join Date
    Apr 2009
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    Aotearoha
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    Distro
    Ubuntu 10.04 Lucid Lynx

    Re: Fix upside-down video

    FYI
    The severinsson ffmpeg ppa is the real ffmpeg & does supports video filters.


    ffmpeg -f image2 -i pic1.jpg -vf "vflip ,hflip" -s 640x360 out.jpg

    ffmpeg version 0.9.1-4:0.9.1-0ubuntu1~jon1~lucid1, Copyright (c) 2000-2012 the FFmpeg developers
    built on Jan 7 2012 15:05:25 with gcc 4.4.3
    Attached Images Attached Images

  9. #9
    Join Date
    Nov 2007
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    141

    Re: Fix upside-down video

    Thank you all. I had the presentation today. We ended up using a different video file (For other reasons).

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