From e337c9d56408dc00a15887309488a1ff5cb06ba3 Mon Sep 17 00:00:00 2001
From: Carl Eugen Hoyos <cehoyos@ag.or.at>
Date: Sun, 1 Sep 2013 20:20:47 +0200
Subject: [PATCH] Read h264 headers from v4l2 to allow stream-copying.

Fixes ticket #2882.
Analyzed and tested by William C Bonner.
---
 libavdevice/v4l2.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/libavdevice/v4l2.c b/libavdevice/v4l2.c
index 33668c152f..c7cd5190ff 100644
--- a/libavdevice/v4l2.c
+++ b/libavdevice/v4l2.c
@@ -931,6 +931,9 @@ static int v4l2_read_header(AVFormatContext *s1)
     if (codec_id == AV_CODEC_ID_RAWVIDEO)
         st->codec->codec_tag =
             avcodec_pix_fmt_to_codec_tag(st->codec->pix_fmt);
+    else if (codec_id == AV_CODEC_ID_H264) {
+        st->need_parsing = AVSTREAM_PARSE_HEADERS;
+    }
     if (desired_format == V4L2_PIX_FMT_YVU420)
         st->codec->codec_tag = MKTAG('Y', 'V', '1', '2');
     else if (desired_format == V4L2_PIX_FMT_YVU410)