what is 'linesize alignment' meaning?

Question

I\'m following ffmpeg tutorial in http://dranger.com/ffmpeg/tutorial01.html.

I have just found that avpicture_get_size function is deprecated.

So I

Answer 1

If you look at the definition of avpicture_get_size in version 3.2 you see the following code:

int avpicture_get_size(enum AVPixelFormat pix_fmt, int width, int height)
{
    return av_image_get_buffer_size(pix_fmt, width, height, 1);
}

It simply calls the suggested function: av_image_get_buffer_size with the align parameter set to 1. I did not go further to find out the full significance of why 1 is used for the depreciated function. As usual with ffmpeg, one can probably figure it out by reading the right code and enough code (with some code experiments).