[FFmpeg-devel] [PATCH] avfilter/vf_scale: fix interlaced chroma for other formats

[Michael Niedermayer]

On Fri, Oct 13, 2023 at 04:22:05PM +0200, Niklas Haas wrote:
> From: Niklas Haas <git at haasn.dev>
> 
> This logic only covers the case of yuv420p. Extend this logic to cover
> *all* vertically subsampled YUV formats, which require the same
> interlaced scaling logic.
> 
> Fortunately, we can get away with re-using the same code for both JPEG
> and MPEG range YUV, because the only difference here is the horizontal
> alignment. (To be fixed in a separate commit)
> ---
>  libavfilter/vf_scale.c | 12 +++++++-----
>  1 file changed, 7 insertions(+), 5 deletions(-)

the patches from H4JO.txt
cause several fate tests to worsen in their stddev. like:

--- ./tests/ref/vsynth/vsynth1-mjpeg-huffman    2023-09-29 01:05:25.534962942 +0200
+++ tests/data/fate/vsynth1-mjpeg-huffman       2023-10-13 20:45:05.228633099 +0200
@@ -1,4 +1,4 @@
 63ea9bd494e16bad8f3a0c8dbb3dc11e *tests/data/fate/vsynth1-mjpeg-huffman.avi
 1391380 tests/data/fate/vsynth1-mjpeg-huffman.avi
-9a3b8169c251d19044f7087a95458c55 *tests/data/fate/vsynth1-mjpeg-huffman.out.rawvideo
-stddev:    7.87 PSNR: 30.21 MAXDIFF:   63 bytes:  7603200/  7603200
+64e440d0421e6b1bf3fbbc539b53e09c *tests/data/fate/vsynth1-mjpeg-huffman.out.rawvideo
+stddev:    8.37 PSNR: 29.67 MAXDIFF:   69 bytes:  7603200/  7603200



This patch in this mail here seems fine

thx

[...]
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Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

In a rich man's house there is no place to spit but his face.
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