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  • Creating mpd files of multiple video resolutions for a video streaming platform

    19 novembre 2022, par WebDiva

    I am creating a video streaming platform. Users can upload videos and multiple resolutions of that video are created during upload. Finally an mpd file is generated using these resolutions. I want to find the most quick and efficient way to do this. Currently, I am using ffmpeg and MP4box for the task.

    


    After hours of research, this is what I am doing currently :

    


      

    1. Strip the audio from video using ffmpeg :

      2. 


    


    ffmpeg -i video.mp4 -c:a aac -ac 2 -ab 128k -vn video-audio.mp4


    


      

    1. Create multiple resolutions of the vide using ffmpeg :

      2. 


    


    ffmpeg -i video.mp4 -an -c:v libx264 -x264opts keyint=33:min-keyint=33:no-scenecut  -b:v 5300k -maxrate 5300k -bufsize 2650k -vf scale=trunc1080:(oh*a/2)*1 video-1080.mp4

ffmpeg -i video.mp4 -an -c:v libx264 -x264opts keyint=33:min-keyint=33:no-scenecut  -b:v 2400k -maxrate 2400k -bufsize 1200k -vf scale=trunc(oh*a/2)*1:720 video-720.mp4

ffmpeg -i video.mp4 -an -c:v libx264 -x264opts keyint=33:min-keyint=33:no-scenecut  -b:v 1060k -maxrate 1060k -bufsize 530k -vf scale=trunc(oh*a/2)*1:478 video-480.mp4

 ffmpeg -i video.mp4 -an -c:v libx264 -x264opts keyint=33:min-keyint=33:no-scenecut  -b:v 600k -maxrate 600k -bufsize 300k -vf scale=trunc(oh*a/2)*1:360 video-360.mp4

ffmpeg -i video.mp4 -an -c:v libx264 -x264opts keyint=33:min-keyint=33:no-scenecut  -b:v 260k -maxrate 260k -bufsize 130k -vf scale=trunc(oh*a/2)*1:242 video-240.mp4


    


      

    1. Finally, generate the dash manifest using MP4Box :

      2. 


    


    MP4Box -dash 1000 -rap -frag-rap -profile onDemand -out video.mpd video-1080.mp4 video-720.mp4 video-480.mp4 video-360.mp4 video-240.mp4 video-audio.mp4


    


    As you can see this is a lot of code and I am not really sure this would work well in production.
So, Is there are a more quick and optimal way of doing exactly the same thing that I am doing right now without this much code ? And will all this be possible just using ffmpeg and not mp4box ? And If multiple users are uploading video at a given time, will these cause any overhead on the server ? Regards.

    


  • FFMPEG : Cut Video AND Include Ending Video/Image

    10 février 2019, par user3273784

    I am using this command line to add a five second image on end of video :

    ffmpeg -i "f:\output\input.mov" -loop 1 -t 5 -i "f:\output\taff.jpg" -f lavfi -t 5 -i anullsrc -filter_complex "[0:v] [0:a] [1:v] [2:a] concat=n=2:v=1:a=1 [v] [a]" -c:v libx264 -c:a aac -strict -2 -map "[v]" -map "[a]" f:\output\output.mp4

    It works great, but sometimes I want to cut the video and then add the five seconds. So, make a 120 second video 110 seconds, then add the 5 second ending.

    Possibly in one command line ? I’ve tried to break it into two, by starting with cutting the video, but then I get an "Unable to parse option value "-1" pixel format" error if I try to re-encode the video I cut with ffmpeg using this :

    ffmpeg -i f:\output\input.mov -vcodec copy -acodec copy -ss 00:00:00.000 -t 00:01:50.000 f:\output\output.mov

    That output video will then give an error if I try to run the first command line against it.

    All feedback appreciated on shortening a video, and then adding ending.

    Cheers !
    Ryan

  • FFMPEG : Cut Video AND Include Ending Video/Image

    7 novembre 2016, par user3273784

    I am using this command line to add a five second image on end of video :

    ffmpeg -i "f:\output\input.mov" -loop 1 -t 5 -i "f:\output\taff.jpg" -f lavfi -t 5 -i anullsrc -filter_complex "[0:v] [0:a] [1:v] [2:a] concat=n=2:v=1:a=1 [v] [a]" -c:v libx264 -c:a aac -strict -2 -map "[v]" -map "[a]" f:\output\output.mp4

    It works great, but sometimes I want to cut the video and then add the five seconds. So, make a 120 second video 110 seconds, then add the 5 second ending.

    Possibly in one command line ? I’ve tried to break it into two, by starting with cutting the video, but then I get an "Unable to parse option value "-1" pixel format" error if I try to re-encode the video I cut with ffmpeg using this :

    ffmpeg -i f:\output\input.mov -vcodec copy -acodec copy -ss 00:00:00.000 -t 00:01:50.000 f:\output\output.mov

    That output video will then give an error if I try to run the first command line against it.

    All feedback appreciated on shortening a video, and then adding ending.

    Cheers !
    Ryan

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