Pr ignore video file under size

[yajrendrag]

Added fix to allow video duration to be obtained from ffprobe format section if streams section is void of duration value.

[BlakeGardner]

This PR fixes the issue for me. Some video files were causing an exception to raise because ffprobe could not find the duration. Below I will provide the ffprobe command before and after this change and how it surfaces the duration on some video files.

Before change

ffprobe -v error -show_entries stream=duration,width,height -print_format json test_video.mkv
{
    "programs": [

    ],
    "streams": [
        {
            "width": 720,
            "height": 480,
            "side_data_list": [
                {

                }
            ]
        },
        {

        }
    ]
}

After change

ffprobe -v error -show_entries stream=duration,width,height:format=duration -print_format json test_video.mkv
{
    "programs": [

    ],
    "streams": [
        {
            "width": 720,
            "height": 480,
            "side_data_list": [
                {

                }
            ]
        },
        {

        }
    ],
    "format": {
        "duration": "633.472000"
    }
}