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Sur d’autres sites (14054)

  • How to get resolution label from a video in ffmpeg

    10 mai 2021, par HnnE

    My goal is to get the labels 1080p,720p,480p,360p,.. from the video using ffmpeg. Some videos doesn't have the correct dimension to it. for example : 854x546

    


    For the meantime I do it like this. 'height' + 'p' = 546p (which is wrong).
Should I check if 'height' > 480 then return 720 ?.

    


  • Merging four videos with different resolution in a Grid with ffmpeg

    5 juillet 2015, par Taufiq

    I want to marge four videos in to one as show below. I have achieve the correct output given all the videos have the same resolution. But I get an undesirable result with different resolution. See below for more details.

    i need ffmpeg code to get to merge 4 videos of different resolution in a grid format

    ffmpeg.exe -i "1.avi" -vf "[in] scale=iw:ih, pad=2*iw:ih [left];movie=2.avi, scale=iw:ih [right]; [left][right] overlay=main_w/2:0 [out]" -b:v 768k "Output1.mp4"
    
ffmpeg.exe -i "3.avi" -vf "[in] scale=iw:ih, pad=2*iw:ih [left];movie=4.avi, scale=iw:ih [right]; [left][right] overlay=main_w/2:0 [out]" -b:v 768k "Output2.mp4"
    
ffmpeg.exe -i "Output1.mp4" -vf "pad=iw:2*ih [top]; movie=Output2.mp4 [bottom]; [top][bottom] overlay=0:main_h/2" "Output_Stacked.mp4"

    Code above gives the follow output.

    For Example

    But the problem arises when I rotate one of the videos and merge them.
    enter image description here.

    Please tell me what I need to change to get the desired result. Thanks
    enter image description here

  • How to calculate the resolution of a video ?

    21 avril 2021, par René Pardon

    So for 1280x720 it's obvious that resolution equals to 720p with an aspect ratio of 1,777777778 (16:9).

    


    But given the width (560px) and height (320px) of a video, how do I calculate the resolution ? Or is it just like using the height of the video ? (320px = 320p ?) And if not, what's the formula to calculate the resolution ?

    


    Because with 560x320 I have an aspect ratio of 1,75 which is close to 16:9 but this doesn't mean it's the same resolution.

    


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