libavcodec/qsvenc.c: Set mjpeg height and width alignment

Currently width_align and height_align are zero when encoding with mjpeg_qsv,
which causes "Error submitting the frame for encoding". This patch sets the alignments.

There is a little bit more about the problem here http://ffmpeg.org/pipermail/ffmpeg-user/2019-November/046143.htmlSigned-off-by: JonCookCubic <jon.cook@cubicmotion.com>
Signed-off-by: Zhong Li <zhongli_dev@126.com>

libavcodec/qsvenc.c

@@ -470,6 +470,12 @@ static int init_video_param_jpeg(AVCodecContext *avctx, QSVEncContext *q)
     q->param.mfx.Quality              = av_clip(avctx->global_quality, 1, 100);
     q->param.mfx.RestartInterval      = 0;
 
+    q->width_align = 16;
+    q->height_align = 16;
+
+    q->param.mfx.FrameInfo.Width = FFALIGN(avctx->width, q->width_align);
+    q->param.mfx.FrameInfo.Height = FFALIGN(avctx->height, q->height_align);
+
     return 0;
 }