[FFmpeg-devel] [PATCH 2/2] ffv1dec: Ensure that pixel format constraints are respected

Carl Eugen Hoyos ceffmpeg at gmail.com
Wed Jul 18 01:06:54 EEST 2018


2018-07-17 23:58 GMT+02:00, Hendrik Leppkes <h.leppkes at gmail.com>:
> On Tue, Jul 17, 2018 at 11:54 PM Carl Eugen Hoyos <ceffmpeg at gmail.com>
> wrote:
>>
>> 2018-07-17 21:39 GMT+02:00, Vittorio Giovara <vittorio.giovara at gmail.com>:
>> > YUV410P requires that sizes are divisible by 4.
>>
>> Do you mean that AV_PIX_FMT_YUV410P requires it?
>> Where is this documented?
>
> Its a consequence of the subsampling factor. 4:1:0 is one-fourth the
> horizontal resolution and half the vertical resolution, as such the
> width has to be a multiple of 4 for that to result in a valid chroma
> dimension.

(Apart from the fact that it appears to work here and is needed to
archive some multimedia files.)
Why wouldn't the chroma dimension be rounded up?

Carl Eugen


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