From 7babc32c7f97813ccecd8d311f576a76110eb7b2 Mon Sep 17 00:00:00 2001
From: Jonathan Marler <johnnymarler@gmail.com>
Date: Fri, 22 Jan 2021 01:48:46 -0700
Subject: [PATCH] more build instruction

picam doesn't build with the bleeding edge master branch of ffmpeg, but it does build with the latest release 4.3.  This updates BUILDING.md to help the user know which version of ffmpeg to build an also includes notes about extra hw acceleration flags for the raspberr pi.
---
 BUILDING.md | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/BUILDING.md b/BUILDING.md
index a8ca411..e08bab7 100644
--- a/BUILDING.md
+++ b/BUILDING.md
@@ -37,6 +37,11 @@ Download ffmpeg source and configure it:
 ```sh
 $ git clone https://git.ffmpeg.org/ffmpeg.git
 $ cd ffmpeg
+$ git checkout n4.3 -b n4.3
+# NOTE: for extra hw acceleration, include these flags in your ./configure below:
+#         --enable-mmal
+#         --enable-omx
+#         --enable-omx-rpi
 $ ./configure --enable-libfdk-aac
 (takes about one minute)
 ```