From 9d5141d1fb4c95600f9ca70a3db5475d1a78667b Mon Sep 17 00:00:00 2001
From: Carl Eugen Hoyos <cehoyos@ag.or.at>
Date: Sat, 10 Dec 2016 16:43:00 +0100
Subject: [PATCH] lavd/v4l2: Avoid setting frame_size to a negative value.

---
 libavdevice/v4l2.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/libavdevice/v4l2.c b/libavdevice/v4l2.c
index ae51d837af..b57909bda6 100644
--- a/libavdevice/v4l2.c
+++ b/libavdevice/v4l2.c
@@ -936,6 +936,7 @@ static int v4l2_read_header(AVFormatContext *ctx)
         goto fail;
 
     st->codecpar->format = ff_fmt_v4l2ff(desired_format, codec_id);
+    if (st->codecpar->format != AV_PIX_FMT_NONE)
     s->frame_size = av_image_get_buffer_size(st->codecpar->format,
                                              s->width, s->height, 1);