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    13 avril 2011, par

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Sur d’autres sites (10395)

  • How to generate a video by looping an image and then concat with another very long video without re-encoding using ffmpeg ?

    23 mars 2021, par Linghao Chen

    I have an image and a very long video (1.5h).
Now I want to generate a heading video about 5 seconds by looping the image, and then concatenate it with the long video. Since the video is long, I don't want to re-encode the videos.
I have tried to generate the heading video using

    


    ffmpeg -loop 1 -i image.png -c:v libx264 -t 5 -pix_fmt yuv420p head.mp4


    


    and then

    


    ffmpeg -f concat -i list.txt -c:v copy concat.mp4


    


    where the list.txt contains

    


    file head.mp4
file longvideo.mp4


    


    I have tried these operations on two machines.
On one machine, the concatenated video has no audio. Moreover, it stucks at 5-10 seconds and directly jump to 11s.
On the other machine, the video and audio are not synchronized.

    


    To provide more information, I have checked the codecs of the two videos by

    


    ffprobe -v error -select_streams v:0 -show_entries stream=codec_name \
  -of default=noprint_wrappers=1:nokey=1 xxxxx.mp4


    


    Both of them are h264.

    


    My question is, how to generate it correctly with ffmpeg ? If it is hard using ffmpeg, is there any method to do it fast ? As far as I know, Adobe Premiere and Final Cut Pro do not export as fast as I expect because they re-encode the videos.

    


  • ffmpeg encoded video has video/audio sync delay when uploading to Facebook & WhatsApp

    13 décembre 2019, par royherma
        "fluent-ffmpeg": "^2.1.2",
    
    "ffmpeg": "^0.0.4",
    
    node : 8

    Code to reproduce

    let command = ffmpeg()
    
        .input(tempFilePath)
    
        .input(watermarkFilePath)
    
        .complexFilter([
    
            "[0:v][1:v]overlay=W-w-20:H-h-20"
    
        ])
    
        .videoBitrate(2500)
    
        .videoCodec('libx264')
    
        .audioCodec('aac')
    
        .format('mp4')
    
        .output(targetTempFilePath)

    When applying the ffmpeg encoding command on the attached video, it plays fine on a local device - the issue however is when uploading to Facebook/WhatsApp the audio/video becomes out of sync

    Any ideas on what i need to change in terms of the video/audio settings so that the audio + video are in sync, even when uploaded to the various social networks ?

    Here’s a link to the 3 video files (original, post ffmpeg, post whatsapp upload that includes delay) if you want to get a better idea !

    https://wetransfer.com/downloads/445dfaf0f323a73c56201b818dc0267b20191213052112/24e635

    Thank you and appreciate any help !!

  • Using ffmpeg to cut up video into smaller video with exactly 30 frames

    30 mars 2018, par MonsieurBeilto

    I need to cut a video with >300 frames into ten videos, where the first video comprises the first 30 frames, the second video comprises frames from 31 to 60 and so on.

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