From f02832904dbce8e0473cdc9c7b09d92493b40a14 Mon Sep 17 00:00:00 2001
From: James Darnley <james.darnley@gmail.com>
Date: Sat, 22 Mar 2014 09:48:52 +0100
Subject: [PATCH] lavc/libx264: add a warning when using qscale

This addresses ticket #3238.

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
---
 libavcodec/libx264.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/libavcodec/libx264.c b/libavcodec/libx264.c
index 60076301a6..ebaf351680 100644
--- a/libavcodec/libx264.c
+++ b/libavcodec/libx264.c
@@ -330,6 +330,9 @@ static av_cold int X264_init(AVCodecContext *avctx)
     X264Context *x4 = avctx->priv_data;
     int sw,sh;
 
+    if (avctx->global_quality > 0)
+        av_log(avctx, AV_LOG_WARNING, "-qscale is ignored, -crf is recommended.\n");
+
     x264_param_default(&x4->params);
 
     x4->params.b_deblocking_filter         = avctx->flags & CODEC_FLAG_LOOP_FILTER;