static void do_video_stats(AVFormatContext *os, AVOutputStream *ost,
                           int frame_size)
{
    AVCodecContext *enc;
    int frame_number;
    double ti1, bitrate, avg_bitrate;
    if (!vstats_file) {
        vstats_file = fopen(vstats_filename, "w");
        if (!vstats_file) {
            perror("fopen");
            ffmpeg_exit(1);
        }
    }
    enc = ost->st->codec;
    if (enc->codec_type == AVMEDIA_TYPE_VIDEO) {
        frame_number = ost->frame_number;
        fprintf(vstats_file, "frame= %5d q= %2.1f ", frame_number, enc->coded_frame->quality/(float)FF_QP2LAMBDA);
        if (enc->flags&CODEC_FLAG_PSNR)
            fprintf(vstats_file, "PSNR= %6.2f ", psnr(enc->coded_frame->error[0]/(enc->width*enc->height*255.0*255.0)));
        fprintf(vstats_file,"f_size= %6d ", frame_size);
        ti1 = ost->sync_opts * av_q2d(enc->time_base);
        if (ti1 < 0.01)
            ti1 = 0.01;
        bitrate = (frame_size * 8) / av_q2d(enc->time_base) / 1000.0;
        avg_bitrate = (double)(video_size * 8) / ti1 / 1000.0;
        fprintf(vstats_file, "s_size= %8.0fkB time= %0.3f br= %7.1fkbits/s avg_br= %7.1fkbits/s ",
            (double)video_size / 1024, ti1, bitrate, avg_bitrate);
        fprintf(vstats_file, "type= %c\n", av_get_picture_type_char(enc->coded_frame->pict_type));
    }
}
['static void do_video_stats(AVFormatContext *os, AVOutputStream *ost,\n                           int frame_size)\n{\n    AVCodecContext *enc;\n    int frame_number;\n    double ti1, bitrate, avg_bitrate;\n    if (!vstats_file) {\n        vstats_file = fopen(vstats_filename, "w");\n        if (!vstats_file) {\n            perror("fopen");\n            ffmpeg_exit(1);\n        }\n    }\n    enc = ost->st->codec;\n    if (enc->codec_type == AVMEDIA_TYPE_VIDEO) {\n        frame_number = ost->frame_number;\n        fprintf(vstats_file, "frame= %5d q= %2.1f ", frame_number, enc->coded_frame->quality/(float)FF_QP2LAMBDA);\n        if (enc->flags&CODEC_FLAG_PSNR)\n            fprintf(vstats_file, "PSNR= %6.2f ", psnr(enc->coded_frame->error[0]/(enc->width*enc->height*255.0*255.0)));\n        fprintf(vstats_file,"f_size= %6d ", frame_size);\n        ti1 = ost->sync_opts * av_q2d(enc->time_base);\n        if (ti1 < 0.01)\n            ti1 = 0.01;\n        bitrate = (frame_size * 8) / av_q2d(enc->time_base) / 1000.0;\n        avg_bitrate = (double)(video_size * 8) / ti1 / 1000.0;\n        fprintf(vstats_file, "s_size= %8.0fkB time= %0.3f br= %7.1fkbits/s avg_br= %7.1fkbits/s ",\n            (double)video_size / 1024, ti1, bitrate, avg_bitrate);\n        fprintf(vstats_file, "type= %c\\n", av_get_picture_type_char(enc->coded_frame->pict_type));\n    }\n}']