This can happen after an intra-only frame. For reference, see:
https://groups.google.com/a/webmproject.org/forum/#!msg/webm-discuss/zaoTxREZjq8/v5Enht87AhcJ
---
libavcodec/vp9.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
diff --git a/libavcodec/vp9.c b/libavcodec/vp9.c
index c2ac997..2f20097 100644
--- a/libavcodec/vp9.c
+++ b/libavcodec/vp9.c
@@ -641,7 +641,12 @@ static int decode_frame_header(AVCodecContext *ctx,
AVFrame *ref = s->refs[s->refidx[i]].f;
int refw = ref->width, refh = ref->height;
- if (refw == w && refh == h) {
+ if (ref->format != fmt) {
+ av_log(ctx, AV_LOG_ERROR,
+ "Ref pixfmt (%d) did not match current frame (%d)",
+ ref->format, fmt);
+ return AVERROR_INVALIDDATA;
+ } else if (refw == w && refh == h) {
s->mvscale[i][0] = s->mvscale[i][1] = 0;
} else {
if (w * 2 < refw || h * 2 < refh || w > 16 * refw || h >
16 * refh) {
--
2.1.2
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