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Sur d’autres sites (13345)

  • ffmpeg - Understand images to video output, players show different images and lengths

    8 juillet 2023, par Matt C

    I'm using multiple images to create a video with each image on a 1-second long frame. This is the command I'm using :

    


     ffmpeg -framerate 1 -i 'image%d.jpg' -c:v libx264 -r 1 -pix_fmt yuv420p out.mp4


    


    This seems straightforward and exactly what many others have done with success. However, the output I get is an mp4 which windows file explorer says is 4 seconds long, and is different in VLC and Windows media player and neither is the desired output.

    


    In Windows : the video plays for 4 seconds with a black screen and at this point the time line at the bottom is filled up at 4 seconds, indicating the video is over. But it keeps playing, for another 4 seconds. And the last 4 seconds (from 0:04 to 0:07) is actually the desired output.

    


    





    


    


    


    


    



    


    


    


    


    


    


    


    


    


    


    


    


    


    


    


    


    


    


    


    


    


    


    


    


    


    


    


    


    


    


    


    


    Frame Image
    1 black screen
    2 black screen
    3 black screen
    4 black screen
    5 image1.jpg
    6 image2.jpg
    7 image3.jpg
    8 image4.jpg

    


    


    In VLC : the video shows last image supplied as input for 3 seconds, followed by the second to last image for 1 second.

    


    





    


    


    


    


    



    


    


    


    


    


    


    


    


    


    


    


    


    


    


    


    


    Frame Image
    1 image4.jpg
    2 image4.jpg
    3 image4.jpg
    4 image3.jpg

    


    


    Questions :

    


      

    1. How/Why are these different in different players ?

      2. 


    2. Why, in VLC, are only two images showing up, and why would one of them last for 3 seconds ?

      3. 


    3. In Windows, why/how is the video 8 seconds long but shows up as 4 seconds both in the file explorer and in the actual media player ?

      4. 


    4. How do I get the desired output, and what caused my case to not work as it did for seemingly most others ?

      5. 


    


  • How to make overlay not hidden under pad area

    26 juin 2023, par Yousuf Essa

    i have the following command where i want overlay two images above image

    


     String command = '-y -i $backgroundImage1 -i $overlayImage1 -i $overlayImage2  -filter_complex '
                  '"[1]scale=600:600[i1];'
                  '[2]scale=600:600[i2];'
                  '[0][i1]overlay=1200:1200[01];'
                  '[01][i2]overlay=800:800'
                  ',pad=width=iw:height=ih+1000:x=0:y=0:color=black'
                  '" $outPutPath';


    


    Now i notice if i position one of the overlay to be within the black pad area that i made so it be hidden behind it , how to solve, so the overlay on top pad ?

    


    if anyone could help so kindly edit my full command because i just start to learn ffmpeg , thanks

    


  • Add video and audio into image, with blend=screen

    14 juillet 2019, par Jejel Boy

    i have an image sized 1800x1200, i want to crop it to 1800x1200. Manage to do that with"

    ffmpeg -i image.jpg -vf "crop=1200:1200:0:0" -y output.jpg

    I would also like to add a video.mp4 with black background as an overlay to the output, but blend=screen so black will be transparent.

    How do i continue with the script ?

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