[Libav-user] Help complete

[Slaus]

On Sat, 2020-03-14 at 12:04 +0100, Carl Eugen Hoyos wrote:
> Am Fr., 13. März 2020 um 14:04 Uhr schrieb Slav <slavmfm at gmail.com>:
> > Hello. I am trying to implement program which reads out plain
> > images
> > (ready for some further usage) from video files, but got issues
> > with
> > sws_scale() complaining about wrong AVFrame format:
> > "[swscaler @ 0x558ef00721a0] bad src image pointers".
> 
> Did you look at doc/examples/scaling_video.c ?
> 
> Carl Eugen
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Thank you for your answer. Was told on stackoverflow.com to properly
allocate frame this way:

AVFrame* frame = av_frame_alloc();
frame->format = whatever;
frame->width = w;
frame->height = h;
av_frame_get_buffer(frame, 32);

and also then discovered that I needed to read resulting (converted)
pixels from sws_scale() output as frame->data[0] instead of frame-
>data. Updated repo https://github.com/SlavMFM/libav_bmp_example if
somebody googles this post. Cheers ^^