Can anyone help in understanding AVFrame.linesize[]?
ffmpeg, libavcodec, stride, video
Solution
In the case of planar data, such as `YUV420`, `linesize[i]` contains stride for the `i`-th plane.
For example, for frame `640x480` `data[0]` contains pointer to `Y` component, `data[1]` and `data[2]` contains pointers to `U` and `V` planes. In this case, `linesize[0] == 640`, `linesize[1] == linesize[2] == 320` (because the `U` and `V` planes is less than `Y` plane half)
In the case of pixel data (`RGB24`), there is only one plane (`data[0]`) and `linesize[0] == width * channels` (`640 * 3` for `RGB24`)
Problem
I tried to find what each cell of `AVFrame.linesize[]` means, but I didn't found. As I understood `linesize[0]` is the width, `linesize[1]` is the height. - If I'm right what does other cells mean? - why after `avcodec_decode_video2(codecCtxDecode, frameDecoded, &frameFinished, &packet);` only linesize[0] has the value and other cells are always 0? UPDATED I think AVFrame.data[i] and AVFrame.linesize[i] are the data of specific color in the row and the length of the row, am I correct?