avformat/movenc: write clap atom for uncompressed yuv in mov

fixes 6145
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

libavformat/movenc.c

@@ -1686,6 +1686,21 @@ static int mov_write_sv3d_tag(AVFormatContext *s, AVIOContext *pb, AVSphericalMa
     return update_size(pb, sv3d_pos);
 }
 
+static int mov_write_clap_tag(AVIOContext *pb, MOVTrack *track)
+{
+    avio_wb32(pb, 40);
+    ffio_wfourcc(pb, "clap");
+    avio_wb32(pb, track->par->width); /* apertureWidth_N */
+    avio_wb32(pb, 1); /* apertureWidth_D (= 1) */
+    avio_wb32(pb, track->height); /* apertureHeight_N */
+    avio_wb32(pb, 1); /* apertureHeight_D (= 1) */
+    avio_wb32(pb, 0); /* horizOff_N (= 0) */
+    avio_wb32(pb, 1); /* horizOff_D (= 1) */
+    avio_wb32(pb, 0); /* vertOff_N (= 0) */
+    avio_wb32(pb, 1); /* vertOff_D (= 1) */
+    return 40;
+}
+
 static int mov_write_pasp_tag(AVIOContext *pb, MOVTrack *track)
 {
     AVRational sar;
@@ -1984,6 +1999,10 @@ static int mov_write_video_tag(AVIOContext *pb, MOVMuxContext *mov, MOVTrack *tr
         mov_write_pasp_tag(pb, track);
     }
 
+    if (uncompressed_ycbcr){
+        mov_write_clap_tag(pb, track);
+    }
+
     if (mov->encryption_scheme != MOV_ENC_NONE) {
         ff_mov_cenc_write_sinf_tag(track, pb, mov->encryption_kid);
     }