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Help with video editing with ffmpeg

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  Help with video editing with ffmpeg Gerardo Ballabio <gerardo.ballabio@gmail.com> - 2019-03-03 18:40 +0100
    Re: Help with video editing with ffmpeg Gerardo Ballabio <gerardo.ballabio@gmail.com> - 2019-03-06 12:10 +0100
      Re: Help with video editing with ffmpeg mick crane <mick.crane@gmail.com> - 2019-03-06 13:30 +0100
      Re: Help with video editing with ffmpeg rhkramer@gmail.com - 2019-03-06 17:30 +0100
      Re: Help with video editing with ffmpeg Gerardo Ballabio <gerardo.ballabio@gmail.com> - 2019-03-13 10:40 +0100
        Re: Help with video editing with ffmpeg mick crane <mick.crane@gmail.com> - 2019-03-13 16:40 +0100
    Re: Help with video editing with ffmpeg Dan Ritter <dsr@randomstring.org> - 2019-03-06 15:20 +0100

#205969 — Help with video editing with ffmpeg

Hello all,
I have a video that was filmed under bad lighting conditions, the
background is too bright and people in the foreground are dark. I'm
trying to use ffmpeg to correct it. Please kindly help me.

Here you can find a snippet:
https://drive.google.com/drive/folders/1aG04znyHdDio7cvgaQlovYTb8bX8NTLL?usp=sharing

video1.mts is the original file. video2.mp4 was created by a friend of
mine using proprietary software on Windows. I've been trying to
reproduce that. video3.mts is the best result I obtained (see below)
but the contrast is still too high and the colors aren't quite right.

I've tried several of ffmpeg's effects but maybe there are some better
ones that I missed?

- "eq=brightness=..." turns black into grey and gives the video a
"foggy" look, no good
- "colorlevels=..." I tried many parameter sets but couldn't do much
better, in the end I concluded that probably linear scaling isn't good
enough and I need nonlinear
- "curves=..." was indeed better but when I stretched the curve beyond
a certain point I obtained distorted colors
- I tried "geq=..." too but it doesn't seem to work, I always get an
error like this:

ffmpeg -i video1.mts -vf geq='r=r(X,Y):g=g(X,Y):b=b(X,Y)' video3.mts
[Parsed_geq_0 @ 0x55a01bb0aa60] [Eval @ 0x7ffd3d63afb0] Missing ')' or
too many args in 'r(X'
[AVFilterGraph @ 0x55a01bb09e80] Error initializing filter 'geq' with
args 'r=r(X'
Error opening filters!

These are the commands that I used to produce video3.mts:

ffmpeg -i video1.mts -vf colorlevels=romax=0.8:gomax=1.0:bomax=0.9 -b
12M temp.mts
ffmpeg -i temp.mts -vf curves=r='0/0.05 0.1/0.25 1/0.8':g='0/0.05
0.1/0.25 1/0.8':b='0/0.05 0.1/0.25 1/0.8' -b 12M video3.mts

Thanks
Gerardo

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#206030

I guess my question was too specific. I'll try asking directly on
ffmpeg mailing list.
Thanks
Gerardo


Il giorno dom 3 mar 2019 alle ore 18:16 Gerardo Ballabio
<gerardo.ballabio@gmail.com> ha scritto:
>
> Hello all,
> I have a video that was filmed under bad lighting conditions, the
> background is too bright and people in the foreground are dark. I'm
> trying to use ffmpeg to correct it. Please kindly help me.
>
> Here you can find a snippet:
> https://drive.google.com/drive/folders/1aG04znyHdDio7cvgaQlovYTb8bX8NTLL?usp=sharing
>
> video1.mts is the original file. video2.mp4 was created by a friend of
> mine using proprietary software on Windows. I've been trying to
> reproduce that. video3.mts is the best result I obtained (see below)
> but the contrast is still too high and the colors aren't quite right.
>
> I've tried several of ffmpeg's effects but maybe there are some better
> ones that I missed?
>
> - "eq=brightness=..." turns black into grey and gives the video a
> "foggy" look, no good
> - "colorlevels=..." I tried many parameter sets but couldn't do much
> better, in the end I concluded that probably linear scaling isn't good
> enough and I need nonlinear
> - "curves=..." was indeed better but when I stretched the curve beyond
> a certain point I obtained distorted colors
> - I tried "geq=..." too but it doesn't seem to work, I always get an
> error like this:
>
> ffmpeg -i video1.mts -vf geq='r=r(X,Y):g=g(X,Y):b=b(X,Y)' video3.mts
> [Parsed_geq_0 @ 0x55a01bb0aa60] [Eval @ 0x7ffd3d63afb0] Missing ')' or
> too many args in 'r(X'
> [AVFilterGraph @ 0x55a01bb09e80] Error initializing filter 'geq' with
> args 'r=r(X'
> Error opening filters!
>
> These are the commands that I used to produce video3.mts:
>
> ffmpeg -i video1.mts -vf colorlevels=romax=0.8:gomax=1.0:bomax=0.9 -b
> 12M temp.mts
> ffmpeg -i temp.mts -vf curves=r='0/0.05 0.1/0.25 1/0.8':g='0/0.05
> 0.1/0.25 1/0.8':b='0/0.05 0.1/0.25 1/0.8' -b 12M video3.mts
>
> Thanks
> Gerardo

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#206032

On 2019-03-06 10:48, Gerardo Ballabio wrote:
> I guess my question was too specific. I'll try asking directly on
> ffmpeg mailing list.
> Thanks
> Gerardo
> 
probably best. I've only used ffmpeg to extract frames.
The syntax can be a bit daunting.
What I'd probably do is extract a frame of concern and see if there is a 
way to adjust curves by eye in Gimp and get/translate numbers from Gimp 
for use in ffmpeg.

mick

-- 
Key ID    4BFEBB31

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#206039

On Wednesday, March 06, 2019 05:48:59 AM Gerardo Ballabio wrote:
> I guess my question was too specific. I'll try asking directly on
> ffmpeg mailing list.

If you get it figured out, I (and probably others) would be interested in how 
to do it -- maybe you could post a summary here with a link to the thread on 
the ffmpeg mailing list.

Thanks!

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#206216

For the record, here's the thread on ffmpeg-user mailing list:
http://ffmpeg.org/pipermail/ffmpeg-user/2019-March/043677.html

Gerardo




Il giorno mer 6 mar 2019 alle ore 11:48 Gerardo Ballabio
<gerardo.ballabio@gmail.com> ha scritto:
>
> I guess my question was too specific. I'll try asking directly on
> ffmpeg mailing list.
> Thanks
> Gerardo
>
>
> Il giorno dom 3 mar 2019 alle ore 18:16 Gerardo Ballabio
> <gerardo.ballabio@gmail.com> ha scritto:
> >
> > Hello all,
> > I have a video that was filmed under bad lighting conditions, the
> > background is too bright and people in the foreground are dark. I'm
> > trying to use ffmpeg to correct it. Please kindly help me.
> >
> > Here you can find a snippet:
> > https://drive.google.com/drive/folders/1aG04znyHdDio7cvgaQlovYTb8bX8NTLL?usp=sharing
> >
> > video1.mts is the original file. video2.mp4 was created by a friend of
> > mine using proprietary software on Windows. I've been trying to
> > reproduce that. video3.mts is the best result I obtained (see below)
> > but the contrast is still too high and the colors aren't quite right.
> >
> > I've tried several of ffmpeg's effects but maybe there are some better
> > ones that I missed?
> >
> > - "eq=brightness=..." turns black into grey and gives the video a
> > "foggy" look, no good
> > - "colorlevels=..." I tried many parameter sets but couldn't do much
> > better, in the end I concluded that probably linear scaling isn't good
> > enough and I need nonlinear
> > - "curves=..." was indeed better but when I stretched the curve beyond
> > a certain point I obtained distorted colors
> > - I tried "geq=..." too but it doesn't seem to work, I always get an
> > error like this:
> >
> > ffmpeg -i video1.mts -vf geq='r=r(X,Y):g=g(X,Y):b=b(X,Y)' video3.mts
> > [Parsed_geq_0 @ 0x55a01bb0aa60] [Eval @ 0x7ffd3d63afb0] Missing ')' or
> > too many args in 'r(X'
> > [AVFilterGraph @ 0x55a01bb09e80] Error initializing filter 'geq' with
> > args 'r=r(X'
> > Error opening filters!
> >
> > These are the commands that I used to produce video3.mts:
> >
> > ffmpeg -i video1.mts -vf colorlevels=romax=0.8:gomax=1.0:bomax=0.9 -b
> > 12M temp.mts
> > ffmpeg -i temp.mts -vf curves=r='0/0.05 0.1/0.25 1/0.8':g='0/0.05
> > 0.1/0.25 1/0.8':b='0/0.05 0.1/0.25 1/0.8' -b 12M video3.mts
> >
> > Thanks
> > Gerardo

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#206232

On 2019-03-13 09:16, Gerardo Ballabio wrote:
> For the record, here's the thread on ffmpeg-user mailing list:
> http://ffmpeg.org/pipermail/ffmpeg-user/2019-March/043677.html
> 
> Gerardo

cheers, that's neat that you can import values directly from a .png.

mick

-- 
Key ID    4BFEBB31

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#206034

Gerardo Ballabio wrote: 
> Hello all,
> I have a video that was filmed under bad lighting conditions, the
> background is too bright and people in the foreground are dark. I'm
> trying to use ffmpeg to correct it. Please kindly help me.
> 

You will probably be happiest with a non-linear editor, most of
which have color correction systems.

Debian packages several -- non-linear is a good keyword.

-dsr-

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