[Libav-user] Copying pixels directly from AVFrame->data, possible alignment error.

Jesper Taxbøl jesper at taxboel.dk
Thu Jun 9 20:20:33 CEST 2016

uint64_t src_i = (xx+(yy*src_camera_width))*3;

                    r = f->pAVFrame->data[0][src_i+0];

                    g = f->pAVFrame->data[0][src_i+1];

                    b = f->pAVFrame->data[0][src_i+2];
On 9 Jun 2016 3:02 pm, "Jesper Taxbøl" <jesper at taxboel.dk> wrote:

> I am doing a pixel based transformation directly on an AVFrame->data[0]
> array, and I am experiencing the following artefact:
> http://i.imgur.com/vnABDjE.png
> The source frame I am working on is 3840x2160 pixels in AV_PIX_FMT_BGR24
> format which should place all pixels in the first data array, in BGR order.
> The bottom 1/3 part of the picture has a problem with the colors, and I
> suspect that the pAVFrame has an alignment problem and I just by chance hit
> some data that maps to pixels.
> Any Idea what I am doing wrong?
> Kind regards
> Jesper Taxbøl
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