Saboteur

ffmpeg -framerate 10 -i BLABLA_%03d.jpg -c:v libx264 -pix_fmt yuv420p output.mp4

$ ffprobe -v error -select_streams v:0 -show_entries stream=width,height -of default=nw=1 "My video file.mpg" 
width=704
height=576

$ ffprobe -v error -select_streams v:0 -show_entries stream=width,height -of csv=p=0 "another vide file.mkv"
1280,720

$ ffprobe -v error -select_streams v:0 -show_entries stream=width,height -of json "one_more video.mkv"
{
    "programs": [

    ],
    "streams": [
        {
            "width": 1152,
            "height": 480
        }
    ]
}

FOR /F %%url IN (file.txt) DO (
   ECHO Обработка URL: %%url
   start firefox.exe %%url
   ffmpeg .....
   Taskkill /IM firefox.exe /F
)