dnxhd: Make the encoder message friendlier

libavcodec/dnxhddata.c

@@ -1203,3 +1203,26 @@ int ff_dnxhd_find_cid(AVCodecContext *avctx, int bit_depth)
     }
     return 0;
 }
+
+void ff_dnxhd_list_cid(AVCodecContext *avctx)
+{
+    int i, j;
+
+    for (i = 0; i < FF_ARRAY_ELEMS(ff_dnxhd_cid_table); i++) {
+        const CIDEntry *cid = &ff_dnxhd_cid_table[i];
+        av_log(avctx, AV_LOG_INFO,
+               "cid %d %ux%u %dbits %s bit rates",
+               cid->cid,
+               cid->width, cid->height,
+               cid->bit_depth,
+               cid->interlaced ? "interlaced " :
+                                 "progressive");
+        for (j = 0; j < FF_ARRAY_ELEMS(cid->bit_rates); j++) {
+            if (!cid->bit_rates[j])
+                break;
+            av_log(avctx, AV_LOG_INFO, " %dM",
+                   cid->bit_rates[j]);
+        }
+        av_log(avctx, AV_LOG_INFO, "\n");
+    }
+}

libavcodec/dnxhddata.h

@@ -47,5 +47,6 @@ extern const CIDEntry ff_dnxhd_cid_table[];
 
 int ff_dnxhd_get_cid_table(int cid);
 int ff_dnxhd_find_cid(AVCodecContext *avctx, int bit_depth);
+void ff_dnxhd_list_cid(AVCodecContext *avctx);
 
 #endif /* AVCODEC_DNXHDDATA_H */

libavcodec/dnxhdenc.c

@@ -289,14 +289,15 @@ static av_cold int dnxhd_encode_init(AVCodecContext *avctx)
         break;
     default:
         av_log(avctx, AV_LOG_ERROR,
-               "pixel format is incompatible with DNxHD\n");
+               "Pixel format is incompatible with DNxHD, use yuv422p or yuv422p10.\n");
         return AVERROR(EINVAL);
     }
 
     ctx->cid = ff_dnxhd_find_cid(avctx, bit_depth);
     if (!ctx->cid) {
         av_log(avctx, AV_LOG_ERROR,
-               "video parameters incompatible with DNxHD\n");
+               "Video parameters incompatible with DNxHD, available CIDs:\n");
+        ff_dnxhd_list_cid(avctx);
         return AVERROR(EINVAL);
     }
     av_log(avctx, AV_LOG_DEBUG, "cid %d\n", ctx->cid);