diff --git a/libavcodec/tta.c b/libavcodec/tta.c
index 304f3a81df..3fbee06987 100644
--- a/libavcodec/tta.c
+++ b/libavcodec/tta.c
@@ -129,7 +129,7 @@ static av_cold int tta_decode_init(AVCodecContext * avctx)
 
     s->avctx = avctx;
 
-    // 30bytes includes TTA1 header
+    // 22 bytes for a TTA1 header
     if (avctx->extradata_size < 22)
         return AVERROR_INVALIDDATA;
 
diff --git a/libavformat/matroskadec.c b/libavformat/matroskadec.c
index 3ce1d399e9..d50211bf4f 100644
--- a/libavformat/matroskadec.c
+++ b/libavformat/matroskadec.c
@@ -2558,7 +2558,7 @@ static int matroska_parse_tracks(AVFormatContext *s)
             }
             if (track->audio.out_samplerate < 0 || track->audio.out_samplerate > INT_MAX)
                 return AVERROR_INVALIDDATA;
-            extradata_size = 30;
+            extradata_size = 22;
             extradata      = av_mallocz(extradata_size + AV_INPUT_BUFFER_PADDING_SIZE);
             if (!extradata)
                 return AVERROR(ENOMEM);