---
libavcodec/h263dec.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/libavcodec/h263dec.c b/libavcodec/h263dec.c
index 29634b0..31e014a 100644
--- a/libavcodec/h263dec.c
+++ b/libavcodec/h263dec.c
@@ -513,6 +513,12 @@ int ff_h263_decode_frame(AVCodecContext *avctx, void
*data, int *got_frame,
if ((ret = ff_mpv_common_frame_size_change(s)))
return ret;
+
+ if (avctx->pix_fmt != h263_get_format(avctx)) {
+ av_log(avctx, AV_LOG_ERROR, "format change not supported\n");
+ avctx->pix_fmt = AV_PIX_FMT_NONE;
+ return AVERROR_UNKNOWN;
+ }
}
if (s->codec_id == AV_CODEC_ID_H263 ||
--
2.1.1
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