REM convert video to telegram autoplay (not as file)
ffmpeg -i input  -c:v libx264 -crf 26 -vf scale=640:-1 out.mp4

REM convert vertical video to horizontal video with blur on both sides
ffmpeg \
-i Sequence02.mpeg \
-i Sequence02.mpeg \
-filter_complex \
"[0:v]scale=-1:720[scaled_video]; \
 [1:v]scale=1280:720,boxblur=16[blur_image];\
 [blur_image][scaled_video]overlay=(main_w-overlay_w)/2:(main_h-overlay_h)/2[outv]" \
-aspect 1280/720 -map [outv] -map 0:a -c:a copy result.mp4

REM batch convert multiple files to mp4. filtered by date
forfiles /P E:\DCIM\100CANON /S /D +03.11.2018 /M "*.mov" /C "cmd /c ffmpeg -i @FILE D:\мое\фотки\2018\Эстония\\@FNAME.mp4 -hide_banner"