[FFmpeg-user] Color matching to source a problem for ProRes
Kieran O Leary
kieran.o.leary at gmail.com
Wed Jul 18 16:38:15 EEST 2018
Hi,
On Wed, 18 Jul 2018, 13:48 Pete Willis, <pete at flatgrey.com> wrote:
> We are trying to match the output colour to the source content but
> although the output formats matches the source we cannot get it to match.
>
> Screenshot attached of the 3 outputs plus the original (top right) we have
> tested with media info for each:
>
I don't see any screenshots. It is best to copy paste the full, uncut
terminal output including your actual commands.
>
>
> Using these settings:
>
>
> flags=lanczos,colormatrix=bt601:bt709 [v] -acodec pcm_s24le -b:a 128k
> -b:v 512k -vcodec prores_ks -r 23.976023976023978 -f mov -profile:v 3
> -qscale 4 -pix_fmt yuv422p -y -map [v] -map [a] -timecode 00:59:53:00
> /videos/C1234_100_12HD_TestRaw.mov
>
Can you post the full commands you used? This would tell us which version
of ffmpeg you are using as well.
You could try adding the `-movflags write_colr` option as it appears that
FFmpeg might not be writing colr atoms without it.
You could also specify the -color_trc, -color_primaries and -colorspace
values to bt709.
Also yuv422p is 8-bit and is not supported by `prores_ks`. FFmpeg probably
autoselected yuv422p10le for you.
Also it looks like you're declaring 128k bitrate for uncompressed 24-bit
audio which is kinda weird. 512k bitrate for video which is also weird and
probably ignored by the prores encoder.
>
>
> We have also tried -pix_fmt yuv422p10le (number 4 in the image)
>
> Removing the flags=lanczos (Number 3)
>
>
> Below is the media info for each
>
> 1. (Top left) output
> Video
> ID : 1
> Format : ProRes
> Format version : Version 0
> Format profile : 422 HQ
> Codec ID : apch
> Duration : 37s 37ms
> Bit rate mode : Variable
> Bit rate : 124 Mbps
> Width : 1 920 pixels
> Height : 1 080 pixels
> Display aspect ratio : 16:9
> Frame rate mode : Constant
> Frame rate : 23.976 (24000/1001) fps
> Color space : YUV
> Chroma subsampling : 4:2:2
> Scan type : Progressive
> Bits/(Pixel*Frame) : 2.485
> Stream size : 546 MiB (98%)
> Writing library : Lavc
> Language : English
> Color primaries : BT.709
> Transfer characteristics : BT.709
> Matrix coefficients : BT.709
>
>
> 2. (Top right) source content
>
> ID : 1
> Format : ProRes
> Format version : Version 0
> Format profile : 422 HQ
> Codec ID : apch
> Duration : 37s 37ms
> Bit rate mode : Variable
> Bit rate : 89.7 Mbps
> Width : 1 920 pixels
> Height : 1 080 pixels
> Display aspect ratio : 16:9
> Frame rate mode : Constant
> Frame rate : 23.976 (24000/1001) fps
> Color space : YUV
> Chroma subsampling : 4:2:2
> Scan type : Progressive
> Bits/(Pixel*Frame) : 1.805
> Stream size : 396 MiB (98%)
> Writing library : aut0
> Language : English
> Encoded date : UTC 2017-04-26 17:06:27
> Tagged date : UTC 2017-04-26 17:06:27
> Color primaries : BT.709
> Transfer characteristics : BT.709
> Matrix coefficients : BT.709
> matrix_coefficients_Original : BT.709
>
Btw this is mediainfo telling you that the _Original value is set at a
codec level.
Best,
Kieran.
>
>
> 3. (Bottom left)
>
> ID : 1
> Format : ProRes
> Format version : Version 0
> Format profile : 422 HQ
> Codec ID : apch
> Duration : 37s 37ms
> Bit rate mode : Variable
> Bit rate : 123 Mbps
> Width : 1 920 pixels
> Height : 1 080 pixels
> Display aspect ratio : 16:9
> Frame rate mode : Constant
> Frame rate : 23.976 (24000/1001) fps
> Color space : YUV
> Chroma subsampling : 4:2:2
> Scan type : Progressive
> Bits/(Pixel*Frame) : 2.478
> Stream size : 544 MiB (98%)
> Writing library : Lavc
> Language : English
>
> 4. Bottom (right)
>
> ID : 1
> Format : ProRes
> Format version : Version 0
> Format profile : 422 HQ
> Codec ID : apch
> Duration : 37s 37ms
> Bit rate mode : Variable
> Bit rate : 119 Mbps
> Width : 1 920 pixels
> Height : 1 080 pixels
> Display aspect ratio : 16:9
> Frame rate mode : Constant
> Frame rate : 23.976 (24000/1001) fps
> Color space : YUV
> Chroma subsampling : 4:2:2
> Scan type : Progressive
> Bits/(Pixel*Frame) : 2.398
> Stream size : 526 MiB (98%)
> Writing library : Lavc
> Language : English
> Matrix coefficients : BT.709
>
>
>
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