[FFmpeg-cvslog] ffmpeg/qsv: fix QSV-accelerated transcode performance drop issue.

[Jun Zhao]

ffmpeg | branch: master | Jun Zhao <mypopydev at gmail.com> | Thu Aug 11 15:34:01 2016 +0800| [46bfc1562f187e3c04ea1b9baa1a1d0580530485] | committer: Michael Niedermayer

ffmpeg/qsv: fix QSV-accelerated transcode performance drop issue.

the merge commit 1b04ea1 "avconv: create simple filtergraphs earlier"
will init the filtergraphs earlier, then init the QSV transcode can't
suppose the nb_filters's value, else lead to the QSV transcode performance
drop.

Signed-off-by: Jun Zhao <mypopydev at gmail.com>
Reviewed-by: Ivan Uskov <ivan.uskov at nablet.com
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=46bfc1562f187e3c04ea1b9baa1a1d0580530485
---

 ffmpeg_qsv.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/ffmpeg_qsv.c b/ffmpeg_qsv.c
index 95a2351..acc54dd 100644
--- a/ffmpeg_qsv.c
+++ b/ffmpeg_qsv.c
@@ -210,8 +210,7 @@ int qsv_transcode_init(OutputStream *ost)
 
     /* check if the decoder supports QSV and the output only goes to this stream */
     ist = input_streams[ost->source_index];
-    if (ist->nb_filters || ist->hwaccel_id != HWACCEL_QSV ||
-        !ist->dec || !ist->dec->pix_fmts)
+    if (ist->hwaccel_id != HWACCEL_QSV || !ist->dec || !ist->dec->pix_fmts)
         return 0;
     for (pix_fmt = ist->dec->pix_fmts; *pix_fmt != AV_PIX_FMT_NONE; pix_fmt++)
         if (*pix_fmt == AV_PIX_FMT_QSV)