avcodec/pngdec: reset has_trns after every decode_frame_png()

Fixes #4887.

Signed-off-by: Paul B Mahol <onemda@gmail.com>
(cherry picked from commit 1d0487f77f07663c510207eb6e946675b71823cb)
This commit is contained in:
Paul B Mahol 2015-09-28 20:53:01 +02:00 committed by Carl Eugen Hoyos
parent 635831c087
commit 39df4d2475

View File

@ -1254,7 +1254,7 @@ static int decode_frame_png(AVCodecContext *avctx,
return AVERROR_INVALIDDATA;
}
s->y = s->state = 0;
s->y = s->state = s->has_trns = 0;
/* init the zlib */
s->zstream.zalloc = ff_png_zalloc;