diff --git a/libavformat/avidec.c b/libavformat/avidec.c
index ff270edae5c750b0ce5e0a976be98b84d4db1d9e..dd2d1d0da6e2a8f88032ecde5386da4429a8e1b7 100644
--- a/libavformat/avidec.c
+++ b/libavformat/avidec.c
@@ -1206,7 +1206,7 @@ static int avi_load_index(AVFormatContext *s)
     if (avio_seek(pb, avi->movi_end, SEEK_SET) < 0)
         goto the_end; // maybe truncated file
 #ifdef DEBUG_SEEK
-    printf("movi_end=0x%"PRIx64"\n", avi->movi_end);
+    av_log(s, AV_LOG_DEBUG, "movi_end=0x%"PRIx64"\n", avi->movi_end);
 #endif
     for(;;) {
         if (pb->eof_reached)
@@ -1214,7 +1214,7 @@ static int avi_load_index(AVFormatContext *s)
         tag = avio_rl32(pb);
         size = avio_rl32(pb);
 #ifdef DEBUG_SEEK
-        printf("tag=%c%c%c%c size=0x%x\n",
+        av_log(s, AV_LOG_DEBUG, "tag=%c%c%c%c size=0x%x\n",
                tag & 0xff,
                (tag >> 8) & 0xff,
                (tag >> 16) & 0xff,
diff --git a/libavformat/mpeg.c b/libavformat/mpeg.c
index 98506612cd2f487d9c47268be9667b4c7e4ce657..86cee0c4b80500db24571e003f900898d4308e3c 100644
--- a/libavformat/mpeg.c
+++ b/libavformat/mpeg.c
@@ -593,7 +593,7 @@ static int64_t mpegps_read_dts(AVFormatContext *s, int stream_index,
         len = mpegps_read_pes_header(s, &pos, &startcode, &pts, &dts);
         if (len < 0) {
 #ifdef DEBUG_SEEK
-            printf("none (ret=%d)\n", len);
+            av_log(s, AV_LOG_DEBUG, "none (ret=%d)\n", len);
 #endif
             return AV_NOPTS_VALUE;
         }
@@ -604,7 +604,8 @@ static int64_t mpegps_read_dts(AVFormatContext *s, int stream_index,
         avio_skip(s->pb, len);
     }
 #ifdef DEBUG_SEEK
-    printf("pos=0x%"PRIx64" dts=0x%"PRIx64" %0.3f\n", pos, dts, dts / 90000.0);
+    av_log(s, AV_LOG_DEBUG, "pos=0x%"PRIx64" dts=0x%"PRIx64" %0.3f\n",
+           pos, dts, dts / 90000.0);
 #endif
     *ppos = pos;
     return dts;