[FFmpeg-user] zimg colorspace yuv -> rgb possible?

[Andy Furniss]

Andy Furniss wrote:
> Carl Eugen Hoyos wrote:
>> Andy Furniss <adf.lists <at> gmail.com> writes:
>>
>>> After reminding my self recently just how bad ffmpeg yuv -> rgb
>>> can look with interlaced
>>
>> Command line, complete, uncut console output and a sample missing.
>
> It's too soon really I am still thinking about it but until I get
> more time here's commands from bash history the source file and a
> screen of what I get. On left is interlace aware on right is same
> converted as progressive. Zoomed is stationary ball - the moving ball
> shoes that the interlaced scale did it's thing OK = no chroma spill
> between fields unlike the progressive versions on the right.
>
> png best viewed unscaled = download.
>
>>> (without using extra flags).
>>
>> Why is this an issue?
>
> Maybe should be default but needs more investigation.
>
> https://drive.google.com/file/d/0BxP5-S1t9VEEUUR0QnVYRU8yczQ/view?usp=sharing
>
>
>
> https://drive.google.com/file/d/0BxP5-S1t9VEEVkQ2dkhJVGVwVzg/view?usp=sharing
>
>
>
> ffmpeg -i ~/snooker-short.ts -ss 11.2 -sws_flags
> +accurate_rnd+full_chroma_int -vf scale=interl=1 -vframes 1
> snk-i-flags.png
>
> ffmpeg -i ~/snooker-short.ts -ss 11.2 -vf scale=interl=1 -vframes 1
> snk-i.png
>

One thing that is curious if I convert to 422 interlace aware no flags
then to rgb it looks better that going straight to rgb. flags will still
make it better on the second conversion.