[FFmpeg-user] Color Shift -- dpx to prores

[Jeanne Rich]

I ran into some color shift issues when converting to DNxHD mxf's and discovered that the -s option was the culprit, instead I used "-vf scale=1920:1080", not sure how you would put that in with the other scale options, but it's worth a try.

-jeanne

----- On Jun 9, 2015, at 5:08 AM, Hardik Kanakia hardik.kanakia at gmail.com wrote:

> Hello All,
> 
> Tried using the below command, still the issue of color jump persists from
> dpx (RGB) to prores422 (YUV)
> 
> /usr/local/sbin/ffmpeg263/ffmpeg -r 24.000000  -i "hahk_c300_400.%06d.dpx"
> -s 1920x1080 -r 24.000000  -vcodec prores -profile:v 3  -vf
> "scale=in_range=full:in_color_matrix=bt709:out_range=full:out_color_matrix=bt601"
> test_in709_out601_qscale.mov
> ffmpeg version 2.6.3 Copyright (c) 2000-2015 the FFmpeg developers
>  built with gcc 4.4.7 (GCC) 20120313 (Red Hat 4.4.7-3)
>  configuration:
>  libavutil      54. 20.100 / 54. 20.100
>  libavcodec     56. 26.100 / 56. 26.100
>  libavformat    56. 25.101 / 56. 25.101
>  libavdevice    56.  4.100 / 56.  4.100
>  libavfilter     5. 11.102 /  5. 11.102
>  libswscale      3.  1.101 /  3.  1.101
>  libswresample   1.  1.100 /  1.  1.100
> Input #0, image2, from 'hahk_c300_400.%06d.dpx':
>  Duration: 00:00:04.00, start: 0.000000, bitrate: N/A
>    Stream #0:0: Video: dpx, gbrp10le, 1920x1080 [SAR 1:1 DAR 16:9], 25
> tbr, 25 tbn, 25 tbc
> File 'test_in709_out601_qscale.mov' already exists. Overwrite ? [y/N] y
> Output #0, mov, to 'test_in709_out601_qscale.mov':
>  Metadata:
>    encoder         : Lavf56.25.101
>    Stream #0:0: Video: prores (apch) (apch / 0x68637061), yuv422p10le,
> 1920x1080 [SAR 1:1 DAR 16:9], q=2-31, 200 kb/s, 24 fps, 12288 tbn, 24 tbc
>    Metadata:
>      encoder         : Lavc56.26.100 prores
> Stream mapping:
>  Stream #0:0 -> #0:0 (dpx (native) -> prores (native))
> Press [q] to stop, [?] for help
> frame=  100 fps=3.2 q=0.0 Lsize=  104354kB time=00:00:04.16
> bitrate=205168.2kbits/s
> video:104352kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB
> muxing overhead: 0.001424%
> 
> 
> 
> Regards,
> 
> Hardik Kanakia
> 
> On Mon, Jun 8, 2015 at 10:23 PM, Kevin Wheatley <kevin.j.wheatley at gmail.com>
> wrote:
> 
>> You may want to also try -vf scale=out_color_matrix=bt709 instead of
>> the colormatrix as that might give you better quality as ProRes is 10
>> bit, in addition to the options Carl suggested to write the color
>> atom.
>>
>> Kevin
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