Hi!
Attached patch fixes ticket #4479 here.
Please comment, Carl Eugen
diff --git a/libavcodec/mjpegdec.c b/libavcodec/mjpegdec.c
index b1c5b67..0e95ebd 100644
--- a/libavcodec/mjpegdec.c
+++ b/libavcodec/mjpegdec.c
@@ -1653,7 +1653,8 @@ static int mjpeg_decode_app(MJpegDecodeContext *s)
s->avctx->sample_aspect_ratio.num = get_bits(&s->gb, 16);
s->avctx->sample_aspect_ratio.den = get_bits(&s->gb, 16);
- ff_set_sar(s->avctx, s->avctx->sample_aspect_ratio);
+ if (s->avctx->width > 0 && s->avctx->height > 0)
+ ff_set_sar(s->avctx, s->avctx->sample_aspect_ratio);
if (s->avctx->debug & FF_DEBUG_PICT_INFO)
av_log(s->avctx, AV_LOG_INFO,
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