Hi, This is related to the video decoder in caffe2/video/video_decoder.cc using long-deprecated parts of the FFMPEG API that were finally dropped in 5.0.
I filed a bug upstream [1] where I also gave a partial patch that takes care of some of the changes. Someone upstream more knowledgeable about the video decoder in Caffe2 should deal with replacing avcodec_decode_video2 and friends with avcodec_receive_frame though (a purely mechanical change there might be a bit harder). Since the bug is present also in upstream's git HEAD, and is confined to a single file, it should be quite easy to backport a fix as soon as one appears upstream. I'll monitor upstream. [1] https://github.com/pytorch/pytorch/issues/72254 -- Gard