[FFmpeg-devel] [PATCH] lavc/vaapi_encode: fix p_per_i calculate issue.

[Jun Zhao]

From 3afe863771fdb1ebf2316d2f6ae5ea2351e7cb4f Mon Sep 17 00:00:00 2001
From: Jun Zhao <jun.zhao at intel.com>
Date: Wed, 29 Mar 2017 17:18:59 +0800
Subject: [PATCH] lavc/vaapi_encode: fix p_per_i calculate issue.

now gop_size <= (max_b_frames + 1) * p_per_i + 1 (IDR frame),
so celing p_per_i = (gop_size - 1 + max_b_frames) / (max_b_frames + 1)

Signed-off-by: Jun Zhao <jun.zhao at intel.com>
Signed-off-by: Leilei <leilei.shang at intel.com>
---
 libavcodec/vaapi_encode.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavcodec/vaapi_encode.c b/libavcodec/vaapi_encode.c
index 070ff5f..7e9c00f 100644
--- a/libavcodec/vaapi_encode.c
+++ b/libavcodec/vaapi_encode.c
@@ -1433,7 +1433,7 @@ av_cold int ff_vaapi_encode_init(AVCodecContext *avctx)
     ctx->output_order = - ctx->output_delay - 1;
 
     // Currently we never generate I frames, only IDR.
-    ctx->p_per_i = ((avctx->gop_size + avctx->max_b_frames) /
+    ctx->p_per_i = ((avctx->gop_size - 1 + avctx->max_b_frames) /
                     (avctx->max_b_frames + 1));
     ctx->b_per_p = avctx->max_b_frames;
 
-- 
2.9.3