[Libav-user] Getting pixel value at each x, y position of a given frame

[NDJORE BORIS]

Le ven. 5 avr. 2019 à 14:03, Simon Brown <simon.k.brown at gmail.com> a écrit :

>
>>
>> Ok, Thanks!
>>
>> But can you tell me how to get the frame pixel format, please?
>> I use frame->format   but the output is only zero (0) value.
>>
>> Regards
>>
>>>
>>> I have:
>
> av_get_pix_fmt_name(frame->format)
>
> to get a format name, but also:
>
> pix_fmt = video_dec_ctx->pix_fmt;
>
> This should still apply in current version.  pix_fmt is of type "enum
> AVPixelFormat".
> Try:
> https://libav.org/documentation/doxygen/master/structAVCodecContext.html#a0425c77b3d06d71e5db88b1d7e1b37f2
> for more information on that or other options.
>
> Cheers,
> Simon
>
>
Ok Thanks!

But can you give me some explaination about the meaning of macroblock
luminance (mb_mean) and macroblock variance (mb_var), please?

Regards

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