avconv: Don't split out inline sequence headers when stream copying VC1

This is required when stream copying VC1 in ismv - there's one
global header in the moov atom, but keyframes have a separate
sequence header prepended.
Signed-off-by: NMartin Storsjö <martin@martin.st>

avconv.c

@@ -1795,6 +1795,7 @@ static void do_streamcopy(InputStream *ist, OutputStream *ost, const AVPacket *p
     if (  ost->st->codec->codec_id != CODEC_ID_H264
        && ost->st->codec->codec_id != CODEC_ID_MPEG1VIDEO
        && ost->st->codec->codec_id != CODEC_ID_MPEG2VIDEO
+       && ost->st->codec->codec_id != CODEC_ID_VC1
        ) {
         if (av_parser_change(ist->st->parser, ost->st->codec, &opkt.data, &opkt.size, pkt->data, pkt->size, pkt->flags & AV_PKT_FLAG_KEY))
             opkt.destruct = av_destruct_packet;