In mov muxer, override codec tag for h263 in mov, fix remuxing from 3gp

Originally committed as revision 26255 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavformat/movenc.c

@@ -659,6 +659,7 @@ static int mov_get_codec_tag(AVFormatContext *s, MOVTrack *track)
     if (!tag || (track->enc->strict_std_compliance >= FF_COMPLIANCE_NORMAL &&
                  (tag == MKTAG('d','v','c','p') ||
                   track->enc->codec_id == CODEC_ID_RAWVIDEO ||
+                  track->enc->codec_id == CODEC_ID_H263 ||
                   av_get_bits_per_sample(track->enc->codec_id)))) { // pcm audio
         if (track->enc->codec_id == CODEC_ID_DVVIDEO)
             tag = mov_get_dv_codec_tag(s, track);