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ffprobe
Running ffprobe:

./ffprobe -show_format -show_streams -print_format json ${file}

7570 files

Format stats:
mp3: 1
gif: 1
srt: 3
matroska,webm: 10
tty: 13
image2: 60
flv: 97
mpeg: 116
avi: 467
mov,mp4,m4a,3gp,3g2,mj2: 3085
asf: 3648

Audio codec stats:
pcm_u8: 1
vorbis: 1
dca: 1
pcm_mulaw: 1
pcm_s16be: 3
wmav1: 4
pcm_s16le: 6
ac3: 36
mp2: 121
wmapro: 369
mp3: 460
aac: 3148
wmav2: 3272

Video codec stats:
mpeg2video: 1
vp8: 1
gif: 1
flv: 1
msmpeg4v2: 2
vc1: 6
vp6f: 6
msmpeg4: 9
wmv1: 12
ansi: 13
mjpeg: 65
mpeg1video: 115
wmv2: 153
mpeg4: 463
h264: 3146
wmv3: 3507


Sample result:

{
    "streams": [
        {
            "index": 0,
            "codec_name": "wmav2",
            "codec_long_name": "Windows Media Audio 2",
            "codec_type": "audio",
            "codec_time_base": "1/44100",
            "codec_tag_string": "a[1][0][0]",
            "codec_tag": "0x0161",
            "sample_fmt": "fltp",
            "sample_rate": "44100",
            "channels": 2,
            "bits_per_sample": 0,
            "r_frame_rate": "0/0",
            "avg_frame_rate": "0/0",
            "time_base": "1/1000",
            "start_pts": 0,
            "start_time": "0.000000",
            "duration_ts": 1491250,
            "duration": "1491.250000",
            "bit_rate": "48024",
            "disposition": {
                "default": 0,
                "dub": 0,
                "original": 0,
                "comment": 0,
                "lyrics": 0,
                "karaoke": 0,
                "forced": 0,
                "hearing_impaired": 0,
                "visual_impaired": 0,
                "clean_effects": 0,
                "attached_pic": 0
            }
        },
        {
            "index": 1,
            "codec_name": "wmv3",
            "codec_long_name": "Windows Media Video 9",
            "profile": "Main",
            "codec_type": "video",
            "codec_time_base": "1/1000",
            "codec_tag_string": "WMV3",
            "codec_tag": "0x33564d57",
            "width": 640,
            "height": 480,
            "has_b_frames": 0,
            "sample_aspect_ratio": "1:1",
            "display_aspect_ratio": "4:3",
            "pix_fmt": "yuv420p",
            "level": -99,
            "r_frame_rate": "24/1",
            "avg_frame_rate": "0/0",
            "time_base": "1/1000",
            "start_pts": 0,
            "start_time": "0.000000",
            "duration_ts": 1491250,
            "duration": "1491.250000",
            "bit_rate": "1000000",
            "disposition": {
                "default": 0,
                "dub": 0,
                "original": 0,
                "comment": 0,
                "lyrics": 0,
                "karaoke": 0,
                "forced": 0,
                "hearing_impaired": 0,
                "visual_impaired": 0,
                "clean_effects": 0,
                "attached_pic": 0
            }
        }
    ],
    "format": {
        "filename": "/Volumes/Store/v/01.04.08.Rebecca.wmv",
        "nb_streams": 2,
        "nb_programs": 0,
        "format_name": "asf",
        "format_long_name": "ASF (Advanced / Active Streaming Format)",
        "start_time": "0.000000",
        "duration": "1491.250000",
        "size": "196382414",
        "bit_rate": "1053518",
        "probe_score": 100,
        "tags": {
            "WMFSDKVersion": "10.00.00.4357",
            "WMFSDKNeeded": "0.0.0.0000",
            "IsVBR": "0",
            "DeviceConformanceTemplate": "MP@ML",
            "WM/WMADRCPeakReference": "13693",
            "WM/WMADRCAverageReference": "659"
        }
    }
}
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