Hello Michael,

> On Sep 20, 2019, at 12:10 PM, Michael Niedermayer <mich...@niedermayer.cc> 
> wrote:
> 
> On Fri, Sep 20, 2019 at 11:55:17PM +0800, lance.lmw...@gmail.com wrote:
>> From: Limin Wang <lance.lmw...@gmail.com>
>> 
>> Signed-off-by: Limin Wang <lance.lmw...@gmail.com>
>> ---
>> libavcodec/v210_template.c | 20 ++++++++++++++++++++
>> libavcodec/v210enc.c       |  8 +++++---
>> 2 files changed, 25 insertions(+), 3 deletions(-)
> 
> Adding a nearest neighbor scaler or in fact any scaler
> into an encoder is not ok
> 
> This belongs in swscale and it is already there.


Just to be clear, there is no scaling going on here.  The patch just expands 
4:2:0 to 4:2:2 while properly supporting interlaced chroma.  It avoids having 
to auto insert the swscale filter in the case where there is no scaling 
required (e.g. H.264 4:2:0 video being output to decklink in its original 
resolution).

Regards,

Devin
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