[FFmpeg-user] Apparently the ffmpeg software scaler "sucks"

[Reuben Martin]

On Wednesday, May 18, 2016 6:17:04 AM CDT Peter Rabbitson wrote:
> According to a test image taken from
> http://www.4p8.com/eric.brasseur/gamma.html ffmpeg's scaler does not
> properly deal with... well scaling.
> 
> The following pipeline produces a "SUCKS" verdict on ffmpeg 2.8.6:
> 
>    curl -s http://www.4p8.com/eric.brasseur/gamma-1.0-or-2.2.png \
> 
> | ffmpeg -f image2pipe -i - \
> 
>    -vf 'scale=w=iw/2:h=ih/2' -vframes 1 \
>    -c:v bmp -f image2pipe - \
> 
> | ffplay -i -
> 
> Is this a real issue worthy of a bugreport, or is the test image/method
> flawed?
> 

curl -s http://www.4p8.com/eric.brasseur/gamma-1.0-or-2.2.png | \
ffmpeg -f image2pipe -i - \
-vf 'eq=gamma=0.454545,scale=w=iw/2:h=ih/2,eq=gamma=2.2' \
-vframes 1 -c:v bmp -f image2pipe - | ffplay -i -