[SOLVED] [ffmpeg] Brightening a dark video?

[yetanotherlogin]

Hello

I need to brighten a dark video with the following features:

c:\>ffprobe.exe -i input.mp4
ffprobe version N-66595-g1c4c78e Copyright (c) 2007-2014 the FFmpeg developers
  built on Oct  3 2014 22:01:53 with gcc 4.9.1 (GCC)
  configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-av
isynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enab
le-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --
enable-libfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-lib
modplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrw
b --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libschroedinge
r --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --en
able-libvidstab --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis
 --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-
libx265 --enable-libxavs --enable-libxvid --enable-zlib
  libavutil      54.  9.100 / 54.  9.100
  libavcodec     56.  2.101 / 56.  2.101
  libavformat    56.  7.104 / 56.  7.104
  libavdevice    56.  1.100 / 56.  1.100
  libavfilter     5.  1.102 /  5.  1.102
  libswscale      3.  1.100 /  3.  1.100
  libswresample   1.  1.100 /  1.  1.100
  libpostproc    53.  1.100 / 53.  1.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'input.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf54.18.100
  Duration: 00:27:31.04, start: 0.000000, bitrate: 1415 kb/s
    Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 1280x720
[SAR 1:1 DAR 16:9], 1283 kb/s, 25 fps, 25 tbr, 90k tbn, 50 tbc (default)
    Metadata:
      handler_name    : VideoHandler
    Stream #0:1(und): Audio: aac (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 12
5 kb/s (default)
    Metadata:
      handler_name    : SoundHandler

I tried some commands I found, but observed no change:

• -vf mp=eq2=1:1.68:0.3:1.25:1:0.96:1
• -vf "lutyuv=y=val*1.3"
• -vf "lutyuv=y=val*2.0"
• -filter:v lutyuv="y=gammaval(0.7)"

Does someone know what I could try?

Thank you.

[pandy]

I tried some commands I found, but observed no change:[LIST]
...
Does someone know what I could try?

substitute ffmpeg with ffplay - see if there is change on screen (i see change) - then reencode video.

[yetanotherlogin]

Thanks for the tip.

Using ffplay, the video is indeed brighter:

ffplay -i input.mp4  -vf mp=eq2=1:1.68:0.3:1.25:1:0.96:1

Why doesn't this work?

ffmpeg -ss 00:05:00 -t 20 -i input.mp4 -c:v libx264 -vf mp=eq2=1:1.68:0.3:1.25:1:0.96:1 -vf scale=640:-1 -pix_fmt yuv420p -c:a copy -shortest -f mp4 output.mp4

[pandy]

Why doesn't this work?

Incorrect syntax? Works for me after fixing few things.

[yetanotherlogin]

Could you share the command you used?

NOK:

-vf lutyuv=y=val*1.3 scale=640:-1

NOK:

-vf "lutyuv=y=val*1.3 scale=640:-1"

[pandy]

@ffmpeg -t 20 -i %1 -c:v rawvideo -vf mp=eq2=1:1.68:0.3:1.25:1:0.96:1,scale=640:-1,format=pix_fmts=yuv420p -c:a copy -shortest -y output.avi

or

@set x264opts="level=5:qp=25:cabac=1:colorprim=bt709:transfer=bt709:colormatrix=bt709:fullrange=on:overscan=show:pic-struct=1:force-cfr=1:aud=1:threads=auto"
@ffmpeg -t 20 -i %1 -c:v libx264 -preset ultrafast -tune animation -profile:v high -x264opts %x264opts% -x264-params %x264opts% -vf mp=eq2=1:1.68:0.3:1.25:1:0.96:1,scale=640:-1,format=pix_fmts=yuv420p -c:a copy -shortest output.mp4

[yetanotherlogin]

Problem solved, thank you.

ffmpeg -i input.mp4 -vf mp=eq2=1:1.68:0.3:1.25:1:0.96:1,scale=640:-1,format=pix_fmts=yuv420p -c:v libx264 -c:a copy -shortest -f mp4 output.mp4