diff --git a/libavcodec/qdm2.c b/libavcodec/qdm2.c
index 188358a04f..7ef979b5dd 100644
--- a/libavcodec/qdm2.c
+++ b/libavcodec/qdm2.c
@@ -1762,7 +1762,7 @@ static av_cold int qdm2_decode_init(AVCodecContext *avctx)
 
     if (!avctx->extradata || (avctx->extradata_size < 48)) {
         av_log(avctx, AV_LOG_ERROR, "extradata missing or truncated\n");
-        return -1;
+        return AVERROR_INVALIDDATA;
     }
 
     extradata      = avctx->extradata;
@@ -1778,18 +1778,18 @@ static av_cold int qdm2_decode_init(AVCodecContext *avctx)
     if (extradata_size < 12) {
         av_log(avctx, AV_LOG_ERROR, "not enough extradata (%i)\n",
                extradata_size);
-        return -1;
+        return AVERROR_INVALIDDATA;
     }
 
     if (memcmp(extradata, "frmaQDM", 7)) {
         av_log(avctx, AV_LOG_ERROR, "invalid headers, QDM? not found\n");
-        return -1;
+        return AVERROR_INVALIDDATA;
     }
 
     if (extradata[7] == 'C') {
 //        s->is_qdmc = 1;
-        av_log(avctx, AV_LOG_ERROR, "stream is QDMC version 1, which is not supported\n");
-        return -1;
+        avpriv_report_missing_feature(avctx, "QDMC version 1");
+        return AVERROR_PATCHWELCOME;
     }
 
     extradata += 8;
@@ -1800,14 +1800,14 @@ static av_cold int qdm2_decode_init(AVCodecContext *avctx)
     if(size > extradata_size){
         av_log(avctx, AV_LOG_ERROR, "extradata size too small, %i < %i\n",
                extradata_size, size);
-        return -1;
+        return AVERROR_INVALIDDATA;
     }
 
     extradata += 4;
     av_log(avctx, AV_LOG_DEBUG, "size: %d\n", size);
     if (AV_RB32(extradata) != MKBETAG('Q','D','C','A')) {
         av_log(avctx, AV_LOG_ERROR, "invalid extradata, expecting QDCA\n");
-        return -1;
+        return AVERROR_INVALIDDATA;
     }
 
     extradata += 8;
@@ -1882,8 +1882,8 @@ static av_cold int qdm2_decode_init(AVCodecContext *avctx)
 
     // Fail on unknown fft order
     if ((s->fft_order < 7) || (s->fft_order > 9)) {
-        av_log(avctx, AV_LOG_ERROR, "Unknown FFT order (%d), contact the developers!\n", s->fft_order);
-        return -1;
+        avpriv_request_sample(avctx, "Unknown FFT order %d", s->fft_order);
+        return AVERROR_PATCHWELCOME;
     }
     if (s->fft_size != (1 << (s->fft_order - 1))) {
         av_log(avctx, AV_LOG_ERROR, "FFT size %d not power of 2.\n", s->fft_size);
@@ -1990,8 +1990,8 @@ static int qdm2_decode_frame(AVCodecContext *avctx, void *data,
     out = (int16_t *)frame->data[0];
 
     for (i = 0; i < 16; i++) {
-        if (qdm2_decode(s, buf, out) < 0)
-            return -1;
+        if ((ret = qdm2_decode(s, buf, out)) < 0)
+            return ret;
         out += s->channels * s->frame_size;
     }