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• How to cut a video to a certain length and add an intro video to it using ffmpeg-python ?

  16 juillet 2021, par kup

  How to cut a video to a certain length and add an intro video to it using ffmpeg-python ?

  


  What i am doing is :

  


          intro = ffmpeg.input(intro)
        mainvid = ffmpeg.input(mainvid)

        v1 = intro.video
        a1 = intro.audio
        v2 = mainvid.video
        a2 = mainvid.audio

        joined = ffmpeg.concat(v1, a1, v2, a2, v=1, a=1).node
        v3 = joined[0]
        a3 = joined[1]

        (
            ffmpeg
            .output(
                v3,
                a3,
                'out.mkv', 
                vcodec='libx265', )
            .run()
        )


  


  But i dont know how to cut mainvid to a certain length like 10 mins before joining, i know ss will help but dont know how to use it for only mainvid.

  


• Covert video to frames, then back to video without altering the frames in python

  7 mars 2021, par Rashiq

  I am writing a script in python that converts a video (let this video be X) into frames (X′) and then back into the same video (Y). Now, when I break video Y back into frames (Y′) the images are not equal to X′ frames i.e. they have different hashes. I would expect them to be the same, and if being not the same is the expected behaviour, how can I make them the same ?

  


  Is there a way to go from

  


  `video, X —> frames, X′, —> video, Y, —> frames, Y′, —> video, Z, —> frames, Z′

  


  and so on without changing the output from its previous state such the videos X, Y, Z and frames X′, Y′, Z′ are same to each other in their respective sets ?

  


  I have tried multiple video codecs (mp4, avi, mkv) and image formats (tif, jpeg, png). To my understanding, lossy compression codecs should not work by lossless such as tif are not producing consistent output either.

  


  I have followed these video-to-frame and frame-to-video among other tutorials but to no avail. Any help would greatly be appreciated.

  


• ffmpeg overlay video on image and remove video black background

  15 septembre 2021, par Moslem Aslani

  Im using this ffmpeg command to overlay a video on image (with remove black background) :

  


  ffmpeg -loop 1 -i image.png -i video.mp4 -filter_complex [1:v]colorkey=0x000000:0.1:0.1[ckout];[0:v][ckout]overlay[out] -map [out] -t 5 -c:a copy -c:v libx264 -y result.mp4


  


  

  


  But as you can see in the picture, the black parts of the ball have also disappeared. How can I solve this problem ?