[FFmpeg-devel] [PATCH] avfilter: add zscale filter

Paul B Mahol onemda at gmail.com
Tue Sep 22 23:05:07 CEST 2015

On 9/22/15, Moritz Barsnick <barsnick at gmx.net> wrote:
> "I'm only here for the nitpicking." I noticed quite a lot of errors in
> the various documentation recently, and joined the list to submit
> patches. Let me start though by noting my observations here:
>> +  --enable-libzimg         enable zimg, needed for zscale filter [no]
> So, is it "z.img" or "zimg"?

Changed, note that name may change. Also current state is quite unstable
so I will wait with pushing this until it clears up.

>> +The zscale filter forces the output display aspect ratio to be the same
>> +of the input, by changing the output sample aspect ratio.
>    ^^ as


>> + at table @option
>> + at item width, w
>> + at item height, h
>> +Set the output video dimension expression. Default value is the input
>> +dimension.
>> +
>> +If the value is 0, the input width is used for the output.
> a) This is identical to using iw?

Should be.

> b) Width, really? Even if used for the variable "h", "height"?

No, but this was shamelessly stolen from scale filter.

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