prepare_frame    1671 libavutil/hwcontext_vulkan.c     err = prepare_frame(hwfc, &fp->conv_ctx, f, PREP_MODE_WRITE);
prepare_frame    2168 libavutil/hwcontext_vulkan.c     err = prepare_frame(hwfc, &fp->conv_ctx, f, PREP_MODE_RO_SHADER);
prepare_frame    2540 libavutil/hwcontext_vulkan.c     err = prepare_frame(hwfc, &fp->conv_ctx, f, PREP_MODE_EXTERNAL_EXPORT);