[FFmpeg-devel] [PATCH v2] avcodec/mpegpicture: fix "stride changed" failures in gray mode

[Aman Gupta]

From: Aman Gupta <aman at tmm1.net>

Before adding uvlinesize check, I was seeing failures decoding
some video with ffmpeg compiled with --enable-gray and using AV_CODEC_FLAG_GRAY.

[mpeg2video @ 0x7fa193818c00] get_buffer() failed (stride changed: linesize=1280/1280 uvlinesize=0/640)
[mpeg2video @ 0x7fa193818c00] get_buffer() failed (stride changed: linesize=1280/1280 uvlinesize=0/640)
---
 libavcodec/mpegpicture.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/libavcodec/mpegpicture.c b/libavcodec/mpegpicture.c
index 2be670cdbc..c0e06900fe 100644
--- a/libavcodec/mpegpicture.c
+++ b/libavcodec/mpegpicture.c
@@ -148,10 +148,12 @@ static int alloc_frame_buffer(AVCodecContext *avctx,  Picture *pic,
         }
     }
 
-    if (linesize && (linesize   != pic->f->linesize[0] ||
-                     uvlinesize != pic->f->linesize[1])) {
+    if ((linesize   &&   linesize != pic->f->linesize[0]) ||
+        (uvlinesize && uvlinesize != pic->f->linesize[1])) {
         av_log(avctx, AV_LOG_ERROR,
-               "get_buffer() failed (stride changed)\n");
+               "get_buffer() failed (stride changed: linesize=%d/%d uvlinesize=%d/%d)\n",
+               linesize,   pic->f->linesize[0],
+               uvlinesize, pic->f->linesize[1]);
         ff_mpeg_unref_picture(avctx, pic);
         return -1;
     }
-- 
2.14.2