avcodec/proresdec2: allow changing resolution

libavcodec/proresdec2.c

@@ -221,9 +221,12 @@ static int decode_frame_header(ProresContext *ctx, const uint8_t *buf,
     height = AV_RB16(buf + 10);
 
     if (width != avctx->width || height != avctx->height) {
-        av_log(avctx, AV_LOG_ERROR, "picture resolution change: %dx%d -> %dx%d\n",
+        int ret;
+
+        av_log(avctx, AV_LOG_WARNING, "picture resolution change: %dx%d -> %dx%d\n",
                avctx->width, avctx->height, width, height);
-        return AVERROR_PATCHWELCOME;
+        if ((ret = ff_set_dimensions(avctx, width, height)) < 0)
+            return ret;
     }
 
     ctx->frame_type = (buf[12] >> 2) & 3;