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Sur d’autres sites (5402)

  • [FFmpeg on Windows] : help me converting a set of .png files to a video file

    31 octobre 2016, par Stefano Fedele

    Hi everybody I am on windows 10, I installed FFMpeg and I would like to use it to convert 100 .png image files into a video file.

    I am using it via the prompt, which is the Windows console, and I am struggling with the syntax (which probability comes from Linux). I set the folder in which ffmpeg.exe is contained as a windows system path as suggested on many websites and I moved the prompt to the folders in which the image files are contained which is reported here :

    cd C:\video\pnts + ag 40 nm- during-tmpyp 10-12- laser power 7mw- kinetic100- exposure time 1s- gain

    I would like to convert the image files contained in this folder into a video file, the names of those image files are reported here :

    pnts + ag 40 nm- during-tmpyp 10-12- laser power 7mw- kinetic100- exposure time 1s- gain 20 001.png

    pnts + ag 40 nm- during-tmpyp 10-12- laser power 7mw- kinetic100- exposure time 1s- gain 20 002.png

    ...

    ...

    pnts + ag 40 nm- during-tmpyp 10-12- laser power 7mw- kinetic100- exposure time 1s- gain 20 100.png

    The number of frames per second whould be 2.

    I read on internet that I should have to type something like this

    ffmpeg -i image-%03d.png video.webm

    But it looks like there are a lot of variables to consider and all the times I try to set them and run FFmpeg I get an error from the prompt.
    Is there anyone who could suggest me the proper syntax, please ?

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  • How to crop and scale correctly with FFMPEG ?

    16 juin 2020, par Rivera A. Pablo

    I'm trying to remove the TOP AND BOTTOM black bars of a video.

    



    Image sample from video
image

    



    What i'm trying to achieve

    



    image

    



    The video itself is 1280x720 16:9, but the portion that's image information is at 4:3 since it's been captured from a VHS. I want to somehow stretch it until the top bars disappear without deforming the image. I don't care about the left and right bars.

    



    I tried using crop and scale with no luck.

    



    By using this code the top and bottom black bars disappeared on VLC when on normal screen but when going Full Screen the bars appeared again.

    



    ffmpeg -i test.avi -filter:v "crop=1280:670" output_video.mp4


    



    I thought it had something to do with the Scale of the video but honestly every scale code I tried to use deformed the image a lot.

    



    I hope someone can help me, fairly new to FFMPEG but really enjoying it this far.