[FFmpeg-user] Convert images to DNXHD 444

[Paul B Mahol]

On 4/11/18, Matt Kitcat <matt at elmtreecottages.co.uk> wrote:
> Thanks. That makes sense. IS there a way I can change this. I
> tried -color_range 1/2 but it makes no difference.

Try zscale filter to convert rgb48 to yuv444p10 format.
Also dnxhd encoder in ffmpeg supports rgba directly so no need of all this.

>
> -----Original Message-----
> From: Martin Vignali
> Sent: Wednesday, April 11, 2018 3:22 PM
> To: FFmpeg user questions
> Subject: Re: [FFmpeg-user] Convert images to DNXHD 444
>
>> There is also an image http://elmtreecottages.co.uk/Charts.jpg which
>> shows a screen example of the difference. (ffmpeg on the left) The
>> quicktime version is, to me, indistinguishable from the source tiff in
>> terms of colour. The ffmpeg version is less saturated and a bit "milky". I
>> have been searching for hours for any way to get the correct output. This
>> happens with dnxhd dnxhq and dnxhdr. Given that re-encoding the quicktime
>> version with ffmpeg does not produce the same colour shift, i.e. the
>> output
>> is identical I am thinking it is the way ffmpeg is dealing with the tiffs
>> rather than the way the encoder is behaving, if this makes sense.
>>
>> Any ideas how/if I can resolve this?
>
>
> Seems like the ffmpeg file is in YUV full range, and the Quicktime output
> is in YUV legal range.
> Also called jpeg range (= full range), and mpeg range (legal range).