VideoStreamInfo: Incorrect total frame count

[smartnet-club]

Executing ffprobe -loglevel error -show_format -show_streams -print_format json -i video.mkv

Found format info: {
    "filename": "video.mkv",
    "nb_streams": 1,
    "nb_programs": 0,
    "format_name": "matroska,webm",
    "format_long_name": "Matroska / WebM",
    "start_time": "0.000000",
    "duration": "299.960000",
    "size": "80968390",
    "bit_rate": "2159444",
    "probe_score": 100,
    "tags": {
        "title": "Media Server",
        "ENCODER": "Lavf58.76.100"
    }
}

Found video stream: {
    "index": 0,
    "codec_name": "h264",
    "codec_long_name": "H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10",
    "profile": "Main",
    "codec_type": "video",
    "codec_tag_string": "[0][0][0][0]",
    "codec_tag": "0x0000",
    "width": 4096,
    "height": 2160,
    "coded_width": 4096,
    "coded_height": 2160,
    "closed_captions": 0,
    "has_b_frames": 2,
    "sample_aspect_ratio": "1:1",
    "display_aspect_ratio": "256:135",
    "pix_fmt": "yuv420p",
    "level": 51,
    "color_range": "tv",
    "color_space": "bt709",
    "color_transfer": "bt709",
    "color_primaries": "bt709",
    "chroma_location": "left",
    "field_order": "progressive",
    "refs": 1,
    "is_avc": "true",
    "nal_length_size": "4",
    "r_frame_rate": "25/1",
    "avg_frame_rate": "25/1",
    "time_base": "1/1000",
    "start_pts": 0,
    "start_time": "0.000000",
    "bits_per_raw_sample": "8",
    "disposition": {
        "default": 1,
        "dub": 0,
        "original": 0,
        "comment": 0,
        "lyrics": 0,
        "karaoke": 0,
        "forced": 0,
        "hearing_impaired": 0,
        "visual_impaired": 0,
        "clean_effects": 0,
        "attached_pic": 0,
        "timed_thumbnails": 0
    },
    "tags": {
        "ENCODER": "Lavc58.134.100 h264_nvenc",
        "DURATION": "00:04:59.960000000"
    }
}

total_frame_count using int(round(self.duration * self.frame_rate)) returns 7499 (299.96*25)

But ffprobe -v error -count_packets -show_streams -print_format json video.mkv returns

{
    "streams": [
        {
...
            "nb_read_packets": "7483",
...
        }
    ]
}

i.e. we have only 7483 frames

frame count calculation will be more accurate if you add -count_packets to _get_stream_info and parse nb_read_packets in total_frame_count