[FFmpeg-devel] [PATCH 1/2] avfilter/vf_zscale: add slice threading

Paul B Mahol onemda at gmail.com
Fri May 31 18:32:11 EEST 2019


On 5/31/19, Lynne <dev at lynne.ee> wrote:
>
>
>
> May 31, 2019, 2:33 PM by onemda at gmail.com:
>
>> On 5/31/19, Lynne <dev at lynne.ee> wrote:
>>
>>>
>>>
>>>
>>> May 31, 2019, 2:16 PM by onemda at gmail.com:
>>>
>>>> On 5/31/19, Lynne <dev at lynne.ee> wrote:
>>>>
>>>>> May 31, 2019, 11:45 AM by onemda at gmail.com <mailto:onemda at gmail.com>:
>>>>>
>>>>>> Signed-off-by: Paul B Mahol <> onemda at gmail.com
>>>>>> <mailto:onemda at gmail.com>>
>>>>>> >
>>>>>> ---
>>>>>> libavfilter/vf_zscale.c | 335 +++++++++++++++++++++++++---------------
>>>>>> 1 file changed, 214 insertions(+), 121 deletions(-)
>>>>>>
>>>>>
>>>>> This will create discontinuities between each slice.
>>>>>
>>>>
>>>> Have you actually tried it?
>>>>
>>>> I had and its just fine.
>>>>
>>>
>>> Bitexact results with non-nearest scaling? Should be even worse with
>>> anything better than bilinear.
>>>
>>
>> Results are always bitexact. It just not bitexact with single
>> threading and differences are irrelevant.
>>
>
> Number of threads should not have any impact at all on quality ever.

Agreed. And it doesn't have any such impact.


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