} if (c->codec_id == CODEC_ID_MPEG1VIDEO){  c->mb_decision=2;
AVStream *add_video_stream(AVFormatContext *oc, int codec_id){    AVCodecContext *c;    AVStream *st;    st = av_new_stream(oc, 0);    if (!st) {        fprintf(stderr, "Could not alloc stream\n");        exit(1);    }        c = &st->codec;    c->codec_id = codec_id;    c->codec_type = CODEC_TYPE_VIDEO;    /* put sample parameters */    c->bit_rate = 400000;    /* resolution must be a multiple of two */    c->width = 352;      c->height = 288;    /* frames per second */    c->frame_rate = STREAM_FRAME_RATE;      c->frame_rate_base = 1;    c->gop_size = 12; /* emit one intra frame every twelve frames at most */    if (c->codec_id == CODEC_ID_MPEG1VIDEO ||        c->codec_id == CODEC_ID_MPEG2VIDEO) {        /* just for testing, we also add B frames */        c->max_b_frames = 2;    }    // some formats want stream headers to be seperate    if(!strcmp(oc->oformat->name, "mp4") || !strcmp(oc->oformat->name, "mov") || !strcmp(oc->oformat->name, "3gp"))        c->flags |= CODEC_FLAG_GLOBAL_HEADER;        return st;}