so if recording file length is 1 hour and I need 59th minute's thumbnail/frame image. it takes time.... right?
ffmpegArgs = string.Format("yadif=0:-1:0,scale=600:337,setsar=1:1,tile={0}x{1}", 1, 1);
ExtractorArgs = string.Format("-loglevel quiet -ss {0} -i \"{1}\" -y -ss {2} -vf {3} -vframes 1 -vsync 0 -an \"{4}_{5}.jpg\"", TimeOffset, aVideoPath, TimeToSeek, ffmpegArgs, strFilenamewithoutExtensionTemp, i)
ffmpeg.exe -loglevel quiet -ss 0 -i test_video.ts -y -ss 00:23:00.000 -vf yadif=0:-1:0,scale=600:337,setsar=1:1,tile=1x1 -vframes 1 -vsync 0 -an out.jpg
ffmpeg.exe -loglevel quiet -ss 00:22:00.000 -i test_video.ts -y -ss 00:01:00.000 -vf yadif=0:-1:0,scale=600:337,setsar=1:1,tile=1x1 -vframes 1 -vsync 0 -an out.jpg