Changes between Version 61 and Version 62 of Scaling

Timestamp:

Aug 24, 2024, 2:53:29 AM (2 years ago)

Author:

Balling

Comment:

new mention of jpeg chroma siting center and new options out_chroma_loc, in_chroma_loc

Scaling

@@ -204 +204 @@
 == Chroma sample location ==
 
-FFmpeg does not see the chroma sample location on either limited or full range file, so you should specify it by hand when going to .rgb (or upsampled from 4:2:0 to 4:4:4 .yuv):
+FFmpeg does not see the chroma sample location on either limited or full range file, so you should specify it by hand when going to .rgb (or when upsampling from 4:2:0 to 4:4:4 in .yuv):
 {{{
 ffmpeg -i cosmos.mkv -vf 'scale=in_h_chr_pos=0:in_v_chr_pos=128' -pix_fmt rgb24 qnfvarejwnfe3.rgb //for left
@@ -210 +210 @@
 }}}
 
-To create BT.2020-NCL matrix with top-left chroma this can be used (if the source image is not using bt.2020 primaries the color managment must be done first on linear data, also correct transfer must be tagged, either SDR or HDR one, again this requires color managment):
+Recently introduced in_chroma_loc and out_chroma_loc can be used as well.
+
+
+{{{
+ffmpeg -i cosmos-p5.mkv -vf scale=in_chroma_loc=left -pix_fmt rgb24 newway.rgb
+}}}
+
+
+{{{
+ffmpeg -i cosmos-p5.mkv -vf scale=in_chroma_loc=topleft -pix_fmt rgb24 newway.rgb
+}}}
+
+
+To create BT.2020-NCL matrix with top-left chroma this can be used (if the source image is not using bt.2020 primaries the color management must be done first on linear data, also correct transfer must be tagged, either SDR or HDR one, again this requires color management):
 {{{
 -vf scale=out_color_matrix=bt2020nc:out_h_chr_pos=0:out_v_chr_pos=0
@@ -219 +232 @@
 ffmpeg -i file.mp4 -c copy -bsf:v hevc_metadata=chroma_sample_loc_type=0 file1.mp4
 }}}
+
+Also, #9693 says that if you want to write jpeg file you need to specify  -vf scale=out_color_matrix=smpte170m:out_chroma_loc=center