[FFmpeg-cvslog] avformat/yuv4mpegenc: Add const where appropriate

[Andreas Rheinhardt]

ffmpeg | branch: master | Andreas Rheinhardt <andreas.rheinhardt at gmail.com> | Fri Sep  4 12:46:09 2020 +0200| [ef91d18a04e0fdf4ca989b34e8fb5d0ea923b5f5] | committer: Andreas Rheinhardt

avformat/yuv4mpegenc: Add const where appropriate

Reviewed-by: Paul B Mahol <onemda at gmail.com>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt at gmail.com>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=ef91d18a04e0fdf4ca989b34e8fb5d0ea923b5f5
---

 libavformat/yuv4mpegenc.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/libavformat/yuv4mpegenc.c b/libavformat/yuv4mpegenc.c
index fdd020e13b..6b53780ba0 100644
--- a/libavformat/yuv4mpegenc.c
+++ b/libavformat/yuv4mpegenc.c
@@ -184,12 +184,10 @@ static int yuv4_write_packet(AVFormatContext *s, AVPacket *pkt)
 {
     AVStream *st = s->streams[pkt->stream_index];
     AVIOContext *pb = s->pb;
-    AVFrame *frame;
+    const AVFrame *frame = (const AVFrame *)pkt->data;
     int width, height, h_chroma_shift, v_chroma_shift;
     int i;
-    uint8_t *ptr, *ptr1, *ptr2;
-
-    frame = (AVFrame *)pkt->data;
+    const uint8_t *ptr, *ptr1, *ptr2;
 
     /* construct frame header */