set elst start time to first pts

git-svn-id: file:///var/local/repositories/ffmpeg/trunk@5981 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b

libavformat/movenc.c

@@ -926,10 +926,7 @@ static int mov_write_edts_tag(ByteIOContext *pb, MOVTrack *track)
 
     put_be32(pb, av_rescale_rnd(track->trackDuration, globalTimescale, track->timescale, AV_ROUND_UP)); /* duration   ... doesn't seem to effect psp */
 
-    if (track->hasBframes)
-        put_be32(pb, track->sampleDuration); /* first pts is 1 */
-    else
-        put_be32(pb, 0);
+    put_be32(pb, track->cluster[0].cts); /* first pts is cts since dts is 0 */
     put_be32(pb, 0x00010000);
     return 0x24;
 }