[FFmpeg-devel] [PATCH 2/2] libavfilter/scale2ref: Maintain main input's DAR

[Michael Niedermayer]

On Mon, Jun 05, 2017 at 06:55:21AM -0400, Kevin Mark wrote:
> The scale2ref filter will now maintain the DAR of the main input and
> not the DAR of the reference input. This previous behavior was deemed
> counterintuitive for most (all?) use-cases.
> 
> Before:
> scale2ref=iw/4:ow/mdar
> in  w:320 h:240 fmt:rgb24 sar:1/1
> ref w:640 h:360 fmt:rgb24 sar:1/1
> out w:160 h:120 fmt:rgb24 sar:4/3 flags:0x2
> SAR: ((120 * 640) / (160 * 360)) * (1 / 1) = 4 / 3
> DAR: (160 / 120) * (4 / 3) = 16 / 9
> (main out now same DAR as ref)
> 
> Now:
> scale2ref=iw/4:ow/mdar
> in  w:320 h:240 fmt:rgb24 sar:1/1
> ref w:640 h:360 fmt:rgb24 sar:1/1
> out w:160 h:120 fmt:rgb24 sar:1/1 flags:0x2
> SAR: ((120 * 320) / (160 * 240)) * (1 / 1) = 1 / 1
> DAR: (160 / 120) * (1 / 1) = 4 / 3
> (main out same DAR as main in)
> 
> The scale2ref FATE test has also been updated.
> 
> Signed-off-by: Kevin Mark <kmark937 at gmail.com>
> ---
>  libavfilter/vf_scale.c                      | 6 +++---
>  tests/ref/fate/filter-scale2ref_keep_aspect | 2 +-
>  2 files changed, 4 insertions(+), 4 deletions(-)

applied

thx

[...]
-- 
Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

Into a blind darkness they enter who follow after the Ignorance,
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to the Knowledge alone. -- Isha Upanishad
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