Is it possible to rotate the frame while decoding a video with ffmpeg c++ api based on the metadata info?

Question

Currently, I got the rotation info by:

av_dict_get(videoStream->metadata, "rotate", NULL, AV_DICT_MATCH_CASE);

Now, how can I apply this rotation value while I decoding the video?

I decode the frame with: avcodec_send_packet() and avcodec_receive_frame() , then covert the pixel format and scale the frame with sws_scale() .

Answer 1

You must use a filter graph and a transpose or hflip filter. Swscale won't do it.