How to resize videos larger than 640:800pixels using ffmpeg

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I'm having two types of videos in the same folder, first one is smaller than 640:800 pixel videos and other one is larger than 640:800 pixel videos. I used ffmpeg to resize video. It works perfect but I need to target only the videos whose pixels are larger than 640:800. How can I target only the specific videos(larger than 640:800) and resize them.

What I have tried:

BAT

for %%a in ("*.mp4") do ffmpeg -i "%%a" -vf scale=640:800 -preset slow -crf 18 "videos\%%~na.mp4"

Posted 20-Aug-21 0:23am

Coding Only

Updated 20-Aug-21 3:13am

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Maciej Los · Answer 1 · 2021-08-20T03:13:00

Solution 1

Take a look here: How can I get the resolution (width and height) for a video file from a linux command line? - Stack Overflow[^] and here: How do I use ffmpeg to get the video resolution? - Super User[^]

As is stated, you can use ffprobe[^] to detect video resolution.

Posted 20-Aug-21 3:13am

Maciej Los

l o o l · Answer 2 · 2021-09-02T04:25:00

Use a loop to get from the values:
"width": 1280,
"height": 720

BAT

for /f useback^tokens^=2delims^=^,^  %%i in (`
    ^2^>^&1 ;ffprobe -v quiet -print_format json -show_format -show_streams -i "%~1" ^
    ^|%__AppDir__%findstr.exe "\"width\": \"height\":" ^|%__AppDir__%findstr.exe [0-9]

Let's say you add the values inside a loop and get:
720
1280

By adding outputs
720 + 1280 = 2000

By adding your limits:
640 + 800 = 1440

Having this, compare with the sum of in a variable and using:
if (condition)else (condition) it is possible to convert your videos:

if outputs gtr limits (convert video file) else do nothing
if 2000 gtr 1440 (ffmpeg ...) else (exit/b)

BAT

@echo off && setlocal 

cd /d "%~dp0" && for %%i in (*.mp4)do set "_cnt=" & call %:^) "%%~i"

%:^)
if "%~1"=="" (endlocal && exit /b) else for /f useback^tokens^=2delims^=^,^  %%i in (`
    ^2^>^&1 ;ffprobe -v quiet -print_format json -show_format -show_streams -i "%~1" ^
    ^|%__AppDir__%findstr.exe "\"width\": \"height\":" ^|%__AppDir__%findstr.exe [0-9]
    `)do call set/a "_cnt+=%%i"

if %_cnt% gtr 1440 (
    ;ffmpeg -i "%~1" -hide_banner -v error -stats -vf scale=640:800 -preset slow -crf 18 ^
	".\videos\%~n1.mp4" & echo\File: "%~1" [Done])else echo\File: "%~1" [Skipped] & exit/b

Note that there is no space or other character at the end of the line ending in ^