void avcodec_register(AVCodec *codec)
{
    AVCodec **p;
    avcodec_init();
    p = &first_avcodec;
    while (*p != NULL) {
    av_log(*p,1,"Name : %s CodecID 0x%x",(*p)->name,(*p)->id);
    p = &(*p)->next;
}
    *p = codec;
    codec->next = NULL;

    if (codec->init_static_data)
        codec->init_static_data(codec);
}