[FFmpeg-cvslog] lavc/videotoolboxenc: fix open videotoolbox bug on iOS8.4

[jerett]

ffmpeg | branch: master | jerett <wj.jiang at outlook.com> | Fri Jun 23 08:58:35 2017 -0400| [9f26d670e447767683ed21b1b5ac16423eba4c72] | committer: Rick Kern

lavc/videotoolboxenc: fix open videotoolbox bug on iOS8.4

Checks for NULL before using object.

Signed-off-by: Rick Kern <kernrj at gmail.com>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=9f26d670e447767683ed21b1b5ac16423eba4c72
---

 libavcodec/videotoolboxenc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavcodec/videotoolboxenc.c b/libavcodec/videotoolboxenc.c
index 7b901dbd69..22eaeb0a60 100644
--- a/libavcodec/videotoolboxenc.c
+++ b/libavcodec/videotoolboxenc.c
@@ -1285,7 +1285,7 @@ static av_cold int vtenc_init(AVCodecContext *avctx)
                                    kCFAllocatorDefault,
                                    &has_b_frames_cfbool);
 
-    if (!status) {
+    if (!status && has_b_frames_cfbool) {
         //Some devices don't output B-frames for main profile, even if requested.
         vtctx->has_b_frames = CFBooleanGetValue(has_b_frames_cfbool);
         CFRelease(has_b_frames_cfbool);